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-rw-r--r--libc/sysdeps/linux/sparc/rem.S376
-rw-r--r--libc/sysdeps/linux/sparc/sdiv.S375
-rw-r--r--libc/sysdeps/linux/sparc/sparcv7/rem.S360
-rw-r--r--libc/sysdeps/linux/sparc/sparcv7/sdiv.S360
-rw-r--r--libc/sysdeps/linux/sparc/sparcv7/udiv.S343
-rw-r--r--libc/sysdeps/linux/sparc/sparcv7/umul.S153
-rw-r--r--libc/sysdeps/linux/sparc/sparcv7/urem.S343
-rw-r--r--libc/sysdeps/linux/sparc/sparcv8/rem.S19
-rw-r--r--libc/sysdeps/linux/sparc/sparcv8/sdiv.S18
-rw-r--r--libc/sysdeps/linux/sparc/sparcv8/udiv.S13
-rw-r--r--libc/sysdeps/linux/sparc/sparcv8/umul.S11
-rw-r--r--libc/sysdeps/linux/sparc/sparcv8/urem.S16
-rw-r--r--libc/sysdeps/linux/sparc/sparcv9/rem.S20
-rw-r--r--libc/sysdeps/linux/sparc/sparcv9/sdiv.S18
-rw-r--r--libc/sysdeps/linux/sparc/sparcv9/udiv.S15
-rw-r--r--libc/sysdeps/linux/sparc/sparcv9/umul.S15
-rw-r--r--libc/sysdeps/linux/sparc/sparcv9/urem.S17
-rw-r--r--libc/sysdeps/linux/sparc/udiv.S357
-rw-r--r--libc/sysdeps/linux/sparc/umul.S163
-rw-r--r--libc/sysdeps/linux/sparc/urem.S359
20 files changed, 1763 insertions, 1588 deletions
diff --git a/libc/sysdeps/linux/sparc/rem.S b/libc/sysdeps/linux/sparc/rem.S
index 3da857e99..595e8ea5e 100644
--- a/libc/sysdeps/linux/sparc/rem.S
+++ b/libc/sysdeps/linux/sparc/rem.S
@@ -1,367 +1,9 @@
- /* This file is generated from divrem.m4; DO NOT EDIT! */
-/*
- * Division and remainder, from Appendix E of the Sparc Version 8
- * Architecture Manual, with fixes from Gordon Irlam.
- */
-
-/*
- * Input: dividend and divisor in %o0 and %o1 respectively.
- *
- * m4 parameters:
- * .rem name of function to generate
- * rem rem=div => %o0 / %o1; rem=rem => %o0 % %o1
- * true true=true => signed; true=false => unsigned
- *
- * Algorithm parameters:
- * N how many bits per iteration we try to get (4)
- * WORDSIZE total number of bits (32)
- *
- * Derived constants:
- * TOPBITS number of bits in the top decade of a number
- *
- * Important variables:
- * Q the partial quotient under development (initially 0)
- * R the remainder so far, initially the dividend
- * ITER number of main division loop iterations required;
- * equal to ceil(log2(quotient) / N). Note that this
- * is the log base (2^N) of the quotient.
- * V the current comparand, initially divisor*2^(ITER*N-1)
- *
- * Cost:
- * Current estimate for non-large dividend is
- * ceil(log2(quotient) / N) * (10 + 7N/2) + C
- * A large dividend is one greater than 2^(31-TOPBITS) and takes a
- * different path, as the upper bits of the quotient must be developed
- * one bit at a time.
- */
-
-
-
-#include <sys/syscall.h>
-
-
-.global .rem;
-.align 4;
-.type .rem ,@function;
-
-.rem:
- ! compute sign of result; if neither is negative, no problem
- orcc %o1, %o0, %g0 ! either negative?
- bge 2f ! no, go do the divide
- mov %o0, %g3 ! sign of remainder matches %o0
- tst %o1
- bge 1f
- tst %o0
- ! %o1 is definitely negative; %o0 might also be negative
- bge 2f ! if %o0 not negative...
- sub %g0, %o1, %o1 ! in any case, make %o1 nonneg
-1: ! %o0 is negative, %o1 is nonnegative
- sub %g0, %o0, %o0 ! make %o0 nonnegative
-2:
-
- ! Ready to divide. Compute size of quotient; scale comparand.
- orcc %o1, %g0, %o5
- bne 1f
- mov %o0, %o3
-
- ! Divide by zero trap. If it returns, return 0 (about as
- ! wrong as possible, but that is what SunOS does...).
- ta 0x02
- retl
- clr %o0
-
-1:
- cmp %o3, %o5 ! if %o1 exceeds %o0, done
- blu .Lgot_result ! (and algorithm fails otherwise)
- clr %o2
- sethi %hi(1 << (32 - 4 - 1)), %g1
- cmp %o3, %g1
- blu .Lnot_really_big
- clr %o4
-
- ! Here the dividend is >= 2**(31-N) or so. We must be careful here,
- ! as our usual N-at-a-shot divide step will cause overflow and havoc.
- ! The number of bits in the result here is N*ITER+SC, where SC <= N.
- ! Compute ITER in an unorthodox manner: know we need to shift V into
- ! the top decade: so do not even bother to compare to R.
- 1:
- cmp %o5, %g1
- bgeu 3f
- mov 1, %g2
- sll %o5, 4, %o5
- b 1b
- add %o4, 1, %o4
-
- ! Now compute %g2.
- 2: addcc %o5, %o5, %o5
- bcc .Lnot_too_big
- add %g2, 1, %g2
-
- ! We get here if the %o1 overflowed while shifting.
- ! This means that %o3 has the high-order bit set.
- ! Restore %o5 and subtract from %o3.
- sll %g1, 4, %g1 ! high order bit
- srl %o5, 1, %o5 ! rest of %o5
- add %o5, %g1, %o5
- b .Ldo_single_div
- sub %g2, 1, %g2
-
- .Lnot_too_big:
- 3: cmp %o5, %o3
- blu 2b
- nop
- be .Ldo_single_div
- nop
- /* NB: these are commented out in the V8-Sparc manual as well */
- /* (I do not understand this) */
- ! %o5 > %o3: went too far: back up 1 step
- ! srl %o5, 1, %o5
- ! dec %g2
- ! do single-bit divide steps
- !
- ! We have to be careful here. We know that %o3 >= %o5, so we can do the
- ! first divide step without thinking. BUT, the others are conditional,
- ! and are only done if %o3 >= 0. Because both %o3 and %o5 may have the high-
- ! order bit set in the first step, just falling into the regular
- ! division loop will mess up the first time around.
- ! So we unroll slightly...
- .Ldo_single_div:
- subcc %g2, 1, %g2
- bl .Lend_regular_divide
- nop
- sub %o3, %o5, %o3
- mov 1, %o2
- b .Lend_single_divloop
- nop
- .Lsingle_divloop:
- sll %o2, 1, %o2
- bl 1f
- srl %o5, 1, %o5
- ! %o3 >= 0
- sub %o3, %o5, %o3
- b 2f
- add %o2, 1, %o2
- 1: ! %o3 < 0
- add %o3, %o5, %o3
- sub %o2, 1, %o2
- 2:
- .Lend_single_divloop:
- subcc %g2, 1, %g2
- bge .Lsingle_divloop
- tst %o3
- b,a .Lend_regular_divide
-
-.Lnot_really_big:
-1:
- sll %o5, 4, %o5
- cmp %o5, %o3
- bleu 1b
- addcc %o4, 1, %o4
- be .Lgot_result
- sub %o4, 1, %o4
-
- tst %o3 ! set up for initial iteration
-.Ldivloop:
- sll %o2, 4, %o2
- ! depth 1, accumulated bits 0
- bl .L1.16
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- ! depth 2, accumulated bits 1
- bl .L2.17
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- ! depth 3, accumulated bits 3
- bl .L3.19
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- ! depth 4, accumulated bits 7
- bl .L4.23
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- b 9f
- add %o2, (7*2+1), %o2
-
-.L4.23:
- ! remainder is negative
- addcc %o3,%o5,%o3
- b 9f
- add %o2, (7*2-1), %o2
-
-
-.L3.19:
- ! remainder is negative
- addcc %o3,%o5,%o3
- ! depth 4, accumulated bits 5
- bl .L4.21
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- b 9f
- add %o2, (5*2+1), %o2
-
-.L4.21:
- ! remainder is negative
- addcc %o3,%o5,%o3
- b 9f
- add %o2, (5*2-1), %o2
-
-
-
-.L2.17:
- ! remainder is negative
- addcc %o3,%o5,%o3
- ! depth 3, accumulated bits 1
- bl .L3.17
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- ! depth 4, accumulated bits 3
- bl .L4.19
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- b 9f
- add %o2, (3*2+1), %o2
-
-.L4.19:
- ! remainder is negative
- addcc %o3,%o5,%o3
- b 9f
- add %o2, (3*2-1), %o2
-
-
-.L3.17:
- ! remainder is negative
- addcc %o3,%o5,%o3
- ! depth 4, accumulated bits 1
- bl .L4.17
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- b 9f
- add %o2, (1*2+1), %o2
-
-.L4.17:
- ! remainder is negative
- addcc %o3,%o5,%o3
- b 9f
- add %o2, (1*2-1), %o2
-
-
-
-
-.L1.16:
- ! remainder is negative
- addcc %o3,%o5,%o3
- ! depth 2, accumulated bits -1
- bl .L2.15
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- ! depth 3, accumulated bits -1
- bl .L3.15
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- ! depth 4, accumulated bits -1
- bl .L4.15
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- b 9f
- add %o2, (-1*2+1), %o2
-
-.L4.15:
- ! remainder is negative
- addcc %o3,%o5,%o3
- b 9f
- add %o2, (-1*2-1), %o2
-
-
-.L3.15:
- ! remainder is negative
- addcc %o3,%o5,%o3
- ! depth 4, accumulated bits -3
- bl .L4.13
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- b 9f
- add %o2, (-3*2+1), %o2
-
-.L4.13:
- ! remainder is negative
- addcc %o3,%o5,%o3
- b 9f
- add %o2, (-3*2-1), %o2
-
-
-
-.L2.15:
- ! remainder is negative
- addcc %o3,%o5,%o3
- ! depth 3, accumulated bits -3
- bl .L3.13
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- ! depth 4, accumulated bits -5
- bl .L4.11
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- b 9f
- add %o2, (-5*2+1), %o2
-
-.L4.11:
- ! remainder is negative
- addcc %o3,%o5,%o3
- b 9f
- add %o2, (-5*2-1), %o2
-
-
-.L3.13:
- ! remainder is negative
- addcc %o3,%o5,%o3
- ! depth 4, accumulated bits -7
- bl .L4.9
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- b 9f
- add %o2, (-7*2+1), %o2
-
-.L4.9:
- ! remainder is negative
- addcc %o3,%o5,%o3
- b 9f
- add %o2, (-7*2-1), %o2
-
-
-
-
- 9:
-.Lend_regular_divide:
- subcc %o4, 1, %o4
- bge .Ldivloop
- tst %o3
- bl,a .Lgot_result
- ! non-restoring fixup here (one instruction only!)
- add %o3, %o1, %o3
-
-
-.Lgot_result:
- ! check to see if answer should be < 0
- tst %g3
- bl,a 1f
- sub %g0, %o3, %o3
-1:
- retl
- mov %o3, %o0
-
-.size .rem,.-.rem;
+#include "_math_inc.h"
+
+#if defined(__CONFIG_SPARC_V9__) || defined(__CONFIG_SPARC_V9B__)
+# include "sparcv9/rem.S"
+#elif defined(__CONFIG_SPARC_V8__)
+# include "sparcv8/rem.S"
+#else
+# include "sparcv7/rem.S"
+#endif
diff --git a/libc/sysdeps/linux/sparc/sdiv.S b/libc/sysdeps/linux/sparc/sdiv.S
index 8fdb7daf8..7e9a9c923 100644
--- a/libc/sysdeps/linux/sparc/sdiv.S
+++ b/libc/sysdeps/linux/sparc/sdiv.S
@@ -1,366 +1,9 @@
- /* This file is generated from divrem.m4; DO NOT EDIT! */
-/*
- * Division and remainder, from Appendix E of the Sparc Version 8
- * Architecture Manual, with fixes from Gordon Irlam.
- */
-
-/*
- * Input: dividend and divisor in %o0 and %o1 respectively.
- *
- * m4 parameters:
- * .div name of function to generate
- * div div=div => %o0 / %o1; div=rem => %o0 % %o1
- * true true=true => signed; true=false => unsigned
- *
- * Algorithm parameters:
- * N how many bits per iteration we try to get (4)
- * WORDSIZE total number of bits (32)
- *
- * Derived constants:
- * TOPBITS number of bits in the top decade of a number
- *
- * Important variables:
- * Q the partial quotient under development (initially 0)
- * R the remainder so far, initially the dividend
- * ITER number of main division loop iterations required;
- * equal to ceil(log2(quotient) / N). Note that this
- * is the log base (2^N) of the quotient.
- * V the current comparand, initially divisor*2^(ITER*N-1)
- *
- * Cost:
- * Current estimate for non-large dividend is
- * ceil(log2(quotient) / N) * (10 + 7N/2) + C
- * A large dividend is one greater than 2^(31-TOPBITS) and takes a
- * different path, as the upper bits of the quotient must be developed
- * one bit at a time.
- */
-
-
-
-#include <sys/syscall.h>
-
-.global .div;
-.align 4;
-.type .div ,@function;
-
-.div:
- ! compute sign of result; if neither is negative, no problem
- orcc %o1, %o0, %g0 ! either negative?
- bge 2f ! no, go do the divide
- xor %o1, %o0, %g3 ! compute sign in any case
- tst %o1
- bge 1f
- tst %o0
- ! %o1 is definitely negative; %o0 might also be negative
- bge 2f ! if %o0 not negative...
- sub %g0, %o1, %o1 ! in any case, make %o1 nonneg
-1: ! %o0 is negative, %o1 is nonnegative
- sub %g0, %o0, %o0 ! make %o0 nonnegative
-2:
-
- ! Ready to divide. Compute size of quotient; scale comparand.
- orcc %o1, %g0, %o5
- bne 1f
- mov %o0, %o3
-
- ! Divide by zero trap. If it returns, return 0 (about as
- ! wrong as possible, but that is what SunOS does...).
- ta 0x02
- retl
- clr %o0
-
-1:
- cmp %o3, %o5 ! if %o1 exceeds %o0, done
- blu .Lgot_result ! (and algorithm fails otherwise)
- clr %o2
- sethi %hi(1 << (32 - 4 - 1)), %g1
- cmp %o3, %g1
- blu .Lnot_really_big
- clr %o4
-
- ! Here the dividend is >= 2**(31-N) or so. We must be careful here,
- ! as our usual N-at-a-shot divide step will cause overflow and havoc.
- ! The number of bits in the result here is N*ITER+SC, where SC <= N.
- ! Compute ITER in an unorthodox manner: know we need to shift V into
- ! the top decade: so do not even bother to compare to R.
- 1:
- cmp %o5, %g1
- bgeu 3f
- mov 1, %g2
- sll %o5, 4, %o5
- b 1b
- add %o4, 1, %o4
-
- ! Now compute %g2.
- 2: addcc %o5, %o5, %o5
- bcc .Lnot_too_big
- add %g2, 1, %g2
-
- ! We get here if the %o1 overflowed while shifting.
- ! This means that %o3 has the high-order bit set.
- ! Restore %o5 and subtract from %o3.
- sll %g1, 4, %g1 ! high order bit
- srl %o5, 1, %o5 ! rest of %o5
- add %o5, %g1, %o5
- b .Ldo_single_div
- sub %g2, 1, %g2
-
- .Lnot_too_big:
- 3: cmp %o5, %o3
- blu 2b
- nop
- be .Ldo_single_div
- nop
- /* NB: these are commented out in the V8-Sparc manual as well */
- /* (I do not understand this) */
- ! %o5 > %o3: went too far: back up 1 step
- ! srl %o5, 1, %o5
- ! dec %g2
- ! do single-bit divide steps
- !
- ! We have to be careful here. We know that %o3 >= %o5, so we can do the
- ! first divide step without thinking. BUT, the others are conditional,
- ! and are only done if %o3 >= 0. Because both %o3 and %o5 may have the high-
- ! order bit set in the first step, just falling into the regular
- ! division loop will mess up the first time around.
- ! So we unroll slightly...
- .Ldo_single_div:
- subcc %g2, 1, %g2
- bl .Lend_regular_divide
- nop
- sub %o3, %o5, %o3
- mov 1, %o2
- b .Lend_single_divloop
- nop
- .Lsingle_divloop:
- sll %o2, 1, %o2
- bl 1f
- srl %o5, 1, %o5
- ! %o3 >= 0
- sub %o3, %o5, %o3
- b 2f
- add %o2, 1, %o2
- 1: ! %o3 < 0
- add %o3, %o5, %o3
- sub %o2, 1, %o2
- 2:
- .Lend_single_divloop:
- subcc %g2, 1, %g2
- bge .Lsingle_divloop
- tst %o3
- b,a .Lend_regular_divide
-
-.Lnot_really_big:
-1:
- sll %o5, 4, %o5
- cmp %o5, %o3
- bleu 1b
- addcc %o4, 1, %o4
- be .Lgot_result
- sub %o4, 1, %o4
-
- tst %o3 ! set up for initial iteration
-.Ldivloop:
- sll %o2, 4, %o2
- ! depth 1, accumulated bits 0
- bl .L1.16
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- ! depth 2, accumulated bits 1
- bl .L2.17
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- ! depth 3, accumulated bits 3
- bl .L3.19
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- ! depth 4, accumulated bits 7
- bl .L4.23
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- b 9f
- add %o2, (7*2+1), %o2
-
-.L4.23:
- ! remainder is negative
- addcc %o3,%o5,%o3
- b 9f
- add %o2, (7*2-1), %o2
-
-
-.L3.19:
- ! remainder is negative
- addcc %o3,%o5,%o3
- ! depth 4, accumulated bits 5
- bl .L4.21
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- b 9f
- add %o2, (5*2+1), %o2
-
-.L4.21:
- ! remainder is negative
- addcc %o3,%o5,%o3
- b 9f
- add %o2, (5*2-1), %o2
-
-
-
-.L2.17:
- ! remainder is negative
- addcc %o3,%o5,%o3
- ! depth 3, accumulated bits 1
- bl .L3.17
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- ! depth 4, accumulated bits 3
- bl .L4.19
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- b 9f
- add %o2, (3*2+1), %o2
-
-.L4.19:
- ! remainder is negative
- addcc %o3,%o5,%o3
- b 9f
- add %o2, (3*2-1), %o2
-
-
-.L3.17:
- ! remainder is negative
- addcc %o3,%o5,%o3
- ! depth 4, accumulated bits 1
- bl .L4.17
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- b 9f
- add %o2, (1*2+1), %o2
-
-.L4.17:
- ! remainder is negative
- addcc %o3,%o5,%o3
- b 9f
- add %o2, (1*2-1), %o2
-
-
-
-
-.L1.16:
- ! remainder is negative
- addcc %o3,%o5,%o3
- ! depth 2, accumulated bits -1
- bl .L2.15
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- ! depth 3, accumulated bits -1
- bl .L3.15
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- ! depth 4, accumulated bits -1
- bl .L4.15
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- b 9f
- add %o2, (-1*2+1), %o2
-
-.L4.15:
- ! remainder is negative
- addcc %o3,%o5,%o3
- b 9f
- add %o2, (-1*2-1), %o2
-
-
-.L3.15:
- ! remainder is negative
- addcc %o3,%o5,%o3
- ! depth 4, accumulated bits -3
- bl .L4.13
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- b 9f
- add %o2, (-3*2+1), %o2
-
-.L4.13:
- ! remainder is negative
- addcc %o3,%o5,%o3
- b 9f
- add %o2, (-3*2-1), %o2
-
-
-
-.L2.15:
- ! remainder is negative
- addcc %o3,%o5,%o3
- ! depth 3, accumulated bits -3
- bl .L3.13
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- ! depth 4, accumulated bits -5
- bl .L4.11
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- b 9f
- add %o2, (-5*2+1), %o2
-
-.L4.11:
- ! remainder is negative
- addcc %o3,%o5,%o3
- b 9f
- add %o2, (-5*2-1), %o2
-
-
-.L3.13:
- ! remainder is negative
- addcc %o3,%o5,%o3
- ! depth 4, accumulated bits -7
- bl .L4.9
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- b 9f
- add %o2, (-7*2+1), %o2
-
-.L4.9:
- ! remainder is negative
- addcc %o3,%o5,%o3
- b 9f
- add %o2, (-7*2-1), %o2
-
-
-
-
- 9:
-.Lend_regular_divide:
- subcc %o4, 1, %o4
- bge .Ldivloop
- tst %o3
- bl,a .Lgot_result
- ! non-restoring fixup here (one instruction only!)
- sub %o2, 1, %o2
-
-
-.Lgot_result:
- ! check to see if answer should be < 0
- tst %g3
- bl,a 1f
- sub %g0, %o2, %o2
-1:
- retl
- mov %o2, %o0
-
-.size .div,.-.div;
+#include "_math_inc.h"
+
+#if defined(__CONFIG_SPARC_V9__) || defined(__CONFIG_SPARC_V9B__)
+# include "sparcv9/sdiv.S"
+#elif defined(__CONFIG_SPARC_V8__)
+# include "sparcv8/sdiv.S"
+#else
+# include "sparcv7/sdiv.S"
+#endif
diff --git a/libc/sysdeps/linux/sparc/sparcv7/rem.S b/libc/sysdeps/linux/sparc/sparcv7/rem.S
new file mode 100644
index 000000000..ce06e6361
--- /dev/null
+++ b/libc/sysdeps/linux/sparc/sparcv7/rem.S
@@ -0,0 +1,360 @@
+ /* This file is generated from divrem.m4; DO NOT EDIT! */
+/*
+ * Division and remainder, from Appendix E of the Sparc Version 8
+ * Architecture Manual, with fixes from Gordon Irlam.
+ */
+
+/*
+ * Input: dividend and divisor in %o0 and %o1 respectively.
+ *
+ * m4 parameters:
+ * .rem name of function to generate
+ * rem rem=div => %o0 / %o1; rem=rem => %o0 % %o1
+ * true true=true => signed; true=false => unsigned
+ *
+ * Algorithm parameters:
+ * N how many bits per iteration we try to get (4)
+ * WORDSIZE total number of bits (32)
+ *
+ * Derived constants:
+ * TOPBITS number of bits in the top decade of a number
+ *
+ * Important variables:
+ * Q the partial quotient under development (initially 0)
+ * R the remainder so far, initially the dividend
+ * ITER number of main division loop iterations required;
+ * equal to ceil(log2(quotient) / N). Note that this
+ * is the log base (2^N) of the quotient.
+ * V the current comparand, initially divisor*2^(ITER*N-1)
+ *
+ * Cost:
+ * Current estimate for non-large dividend is
+ * ceil(log2(quotient) / N) * (10 + 7N/2) + C
+ * A large dividend is one greater than 2^(31-TOPBITS) and takes a
+ * different path, as the upper bits of the quotient must be developed
+ * one bit at a time.
+ */
+
+
+
+ENTRY(.rem)
+ ! compute sign of result; if neither is negative, no problem
+ orcc %o1, %o0, %g0 ! either negative?
+ bge 2f ! no, go do the divide
+ mov %o0, %g3 ! sign of remainder matches %o0
+ tst %o1
+ bge 1f
+ tst %o0
+ ! %o1 is definitely negative; %o0 might also be negative
+ bge 2f ! if %o0 not negative...
+ sub %g0, %o1, %o1 ! in any case, make %o1 nonneg
+1: ! %o0 is negative, %o1 is nonnegative
+ sub %g0, %o0, %o0 ! make %o0 nonnegative
+2:
+
+ ! Ready to divide. Compute size of quotient; scale comparand.
+ orcc %o1, %g0, %o5
+ bne 1f
+ mov %o0, %o3
+
+ ! Divide by zero trap. If it returns, return 0 (about as
+ ! wrong as possible, but that is what SunOS does...).
+ ta ST_DIV0
+ retl
+ clr %o0
+
+1:
+ cmp %o3, %o5 ! if %o1 exceeds %o0, done
+ blu LOC(got_result) ! (and algorithm fails otherwise)
+ clr %o2
+ sethi %hi(1 << (32 - 4 - 1)), %g1
+ cmp %o3, %g1
+ blu LOC(not_really_big)
+ clr %o4
+
+ ! Here the dividend is >= 2**(31-N) or so. We must be careful here,
+ ! as our usual N-at-a-shot divide step will cause overflow and havoc.
+ ! The number of bits in the result here is N*ITER+SC, where SC <= N.
+ ! Compute ITER in an unorthodox manner: know we need to shift V into
+ ! the top decade: so do not even bother to compare to R.
+ 1:
+ cmp %o5, %g1
+ bgeu 3f
+ mov 1, %g2
+ sll %o5, 4, %o5
+ b 1b
+ add %o4, 1, %o4
+
+ ! Now compute %g2.
+ 2: addcc %o5, %o5, %o5
+ bcc LOC(not_too_big)
+ add %g2, 1, %g2
+
+ ! We get here if the %o1 overflowed while shifting.
+ ! This means that %o3 has the high-order bit set.
+ ! Restore %o5 and subtract from %o3.
+ sll %g1, 4, %g1 ! high order bit
+ srl %o5, 1, %o5 ! rest of %o5
+ add %o5, %g1, %o5
+ b LOC(do_single_div)
+ sub %g2, 1, %g2
+
+ LOC(not_too_big):
+ 3: cmp %o5, %o3
+ blu 2b
+ nop
+ be LOC(do_single_div)
+ nop
+ /* NB: these are commented out in the V8-Sparc manual as well */
+ /* (I do not understand this) */
+ ! %o5 > %o3: went too far: back up 1 step
+ ! srl %o5, 1, %o5
+ ! dec %g2
+ ! do single-bit divide steps
+ !
+ ! We have to be careful here. We know that %o3 >= %o5, so we can do the
+ ! first divide step without thinking. BUT, the others are conditional,
+ ! and are only done if %o3 >= 0. Because both %o3 and %o5 may have the high-
+ ! order bit set in the first step, just falling into the regular
+ ! division loop will mess up the first time around.
+ ! So we unroll slightly...
+ LOC(do_single_div):
+ subcc %g2, 1, %g2
+ bl LOC(end_regular_divide)
+ nop
+ sub %o3, %o5, %o3
+ mov 1, %o2
+ b LOC(end_single_divloop)
+ nop
+ LOC(single_divloop):
+ sll %o2, 1, %o2
+ bl 1f
+ srl %o5, 1, %o5
+ ! %o3 >= 0
+ sub %o3, %o5, %o3
+ b 2f
+ add %o2, 1, %o2
+ 1: ! %o3 < 0
+ add %o3, %o5, %o3
+ sub %o2, 1, %o2
+ 2:
+ LOC(end_single_divloop):
+ subcc %g2, 1, %g2
+ bge LOC(single_divloop)
+ tst %o3
+ b,a LOC(end_regular_divide)
+
+LOC(not_really_big):
+1:
+ sll %o5, 4, %o5
+ cmp %o5, %o3
+ bleu 1b
+ addcc %o4, 1, %o4
+ be LOC(got_result)
+ sub %o4, 1, %o4
+
+ tst %o3 ! set up for initial iteration
+LOC(divloop):
+ sll %o2, 4, %o2
+ ! depth 1, accumulated bits 0
+ bl LOC(1.16)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ ! depth 2, accumulated bits 1
+ bl LOC(2.17)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ ! depth 3, accumulated bits 3
+ bl LOC(3.19)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ ! depth 4, accumulated bits 7
+ bl LOC(4.23)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ b 9f
+ add %o2, (7*2+1), %o2
+
+LOC(4.23):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ b 9f
+ add %o2, (7*2-1), %o2
+
+
+LOC(3.19):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ ! depth 4, accumulated bits 5
+ bl LOC(4.21)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ b 9f
+ add %o2, (5*2+1), %o2
+
+LOC(4.21):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ b 9f
+ add %o2, (5*2-1), %o2
+
+
+
+LOC(2.17):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ ! depth 3, accumulated bits 1
+ bl LOC(3.17)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ ! depth 4, accumulated bits 3
+ bl LOC(4.19)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ b 9f
+ add %o2, (3*2+1), %o2
+
+LOC(4.19):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ b 9f
+ add %o2, (3*2-1), %o2
+
+
+LOC(3.17):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ ! depth 4, accumulated bits 1
+ bl LOC(4.17)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ b 9f
+ add %o2, (1*2+1), %o2
+
+LOC(4.17):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ b 9f
+ add %o2, (1*2-1), %o2
+
+
+
+
+LOC(1.16):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ ! depth 2, accumulated bits -1
+ bl LOC(2.15)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ ! depth 3, accumulated bits -1
+ bl LOC(3.15)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ ! depth 4, accumulated bits -1
+ bl LOC(4.15)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ b 9f
+ add %o2, (-1*2+1), %o2
+
+LOC(4.15):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ b 9f
+ add %o2, (-1*2-1), %o2
+
+
+LOC(3.15):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ ! depth 4, accumulated bits -3
+ bl LOC(4.13)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ b 9f
+ add %o2, (-3*2+1), %o2
+
+LOC(4.13):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ b 9f
+ add %o2, (-3*2-1), %o2
+
+
+
+LOC(2.15):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ ! depth 3, accumulated bits -3
+ bl LOC(3.13)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ ! depth 4, accumulated bits -5
+ bl LOC(4.11)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ b 9f
+ add %o2, (-5*2+1), %o2
+
+LOC(4.11):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ b 9f
+ add %o2, (-5*2-1), %o2
+
+
+LOC(3.13):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ ! depth 4, accumulated bits -7
+ bl LOC(4.9)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ b 9f
+ add %o2, (-7*2+1), %o2
+
+LOC(4.9):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ b 9f
+ add %o2, (-7*2-1), %o2
+
+
+
+
+ 9:
+LOC(end_regular_divide):
+ subcc %o4, 1, %o4
+ bge LOC(divloop)
+ tst %o3
+ bl,a LOC(got_result)
+ ! non-restoring fixup here (one instruction only!)
+ add %o3, %o1, %o3
+
+
+LOC(got_result):
+ ! check to see if answer should be < 0
+ tst %g3
+ bl,a 1f
+ sub %g0, %o3, %o3
+1:
+ retl
+ mov %o3, %o0
+
+END(.rem)
diff --git a/libc/sysdeps/linux/sparc/sparcv7/sdiv.S b/libc/sysdeps/linux/sparc/sparcv7/sdiv.S
new file mode 100644
index 000000000..d6f2bc7c7
--- /dev/null
+++ b/libc/sysdeps/linux/sparc/sparcv7/sdiv.S
@@ -0,0 +1,360 @@
+ /* This file is generated from divrem.m4; DO NOT EDIT! */
+/*
+ * Division and remainder, from Appendix E of the Sparc Version 8
+ * Architecture Manual, with fixes from Gordon Irlam.
+ */
+
+/*
+ * Input: dividend and divisor in %o0 and %o1 respectively.
+ *
+ * m4 parameters:
+ * .div name of function to generate
+ * div div=div => %o0 / %o1; div=rem => %o0 % %o1
+ * true true=true => signed; true=false => unsigned
+ *
+ * Algorithm parameters:
+ * N how many bits per iteration we try to get (4)
+ * WORDSIZE total number of bits (32)
+ *
+ * Derived constants:
+ * TOPBITS number of bits in the top decade of a number
+ *
+ * Important variables:
+ * Q the partial quotient under development (initially 0)
+ * R the remainder so far, initially the dividend
+ * ITER number of main division loop iterations required;
+ * equal to ceil(log2(quotient) / N). Note that this
+ * is the log base (2^N) of the quotient.
+ * V the current comparand, initially divisor*2^(ITER*N-1)
+ *
+ * Cost:
+ * Current estimate for non-large dividend is
+ * ceil(log2(quotient) / N) * (10 + 7N/2) + C
+ * A large dividend is one greater than 2^(31-TOPBITS) and takes a
+ * different path, as the upper bits of the quotient must be developed
+ * one bit at a time.
+ */
+
+
+
+ENTRY(.div)
+ ! compute sign of result; if neither is negative, no problem
+ orcc %o1, %o0, %g0 ! either negative?
+ bge 2f ! no, go do the divide
+ xor %o1, %o0, %g3 ! compute sign in any case
+ tst %o1
+ bge 1f
+ tst %o0
+ ! %o1 is definitely negative; %o0 might also be negative
+ bge 2f ! if %o0 not negative...
+ sub %g0, %o1, %o1 ! in any case, make %o1 nonneg
+1: ! %o0 is negative, %o1 is nonnegative
+ sub %g0, %o0, %o0 ! make %o0 nonnegative
+2:
+
+ ! Ready to divide. Compute size of quotient; scale comparand.
+ orcc %o1, %g0, %o5
+ bne 1f
+ mov %o0, %o3
+
+ ! Divide by zero trap. If it returns, return 0 (about as
+ ! wrong as possible, but that is what SunOS does...).
+ ta ST_DIV0
+ retl
+ clr %o0
+
+1:
+ cmp %o3, %o5 ! if %o1 exceeds %o0, done
+ blu LOC(got_result) ! (and algorithm fails otherwise)
+ clr %o2
+ sethi %hi(1 << (32 - 4 - 1)), %g1
+ cmp %o3, %g1
+ blu LOC(not_really_big)
+ clr %o4
+
+ ! Here the dividend is >= 2**(31-N) or so. We must be careful here,
+ ! as our usual N-at-a-shot divide step will cause overflow and havoc.
+ ! The number of bits in the result here is N*ITER+SC, where SC <= N.
+ ! Compute ITER in an unorthodox manner: know we need to shift V into
+ ! the top decade: so do not even bother to compare to R.
+ 1:
+ cmp %o5, %g1
+ bgeu 3f
+ mov 1, %g2
+ sll %o5, 4, %o5
+ b 1b
+ add %o4, 1, %o4
+
+ ! Now compute %g2.
+ 2: addcc %o5, %o5, %o5
+ bcc LOC(not_too_big)
+ add %g2, 1, %g2
+
+ ! We get here if the %o1 overflowed while shifting.
+ ! This means that %o3 has the high-order bit set.
+ ! Restore %o5 and subtract from %o3.
+ sll %g1, 4, %g1 ! high order bit
+ srl %o5, 1, %o5 ! rest of %o5
+ add %o5, %g1, %o5
+ b LOC(do_single_div)
+ sub %g2, 1, %g2
+
+ LOC(not_too_big):
+ 3: cmp %o5, %o3
+ blu 2b
+ nop
+ be LOC(do_single_div)
+ nop
+ /* NB: these are commented out in the V8-Sparc manual as well */
+ /* (I do not understand this) */
+ ! %o5 > %o3: went too far: back up 1 step
+ ! srl %o5, 1, %o5
+ ! dec %g2
+ ! do single-bit divide steps
+ !
+ ! We have to be careful here. We know that %o3 >= %o5, so we can do the
+ ! first divide step without thinking. BUT, the others are conditional,
+ ! and are only done if %o3 >= 0. Because both %o3 and %o5 may have the high-
+ ! order bit set in the first step, just falling into the regular
+ ! division loop will mess up the first time around.
+ ! So we unroll slightly...
+ LOC(do_single_div):
+ subcc %g2, 1, %g2
+ bl LOC(end_regular_divide)
+ nop
+ sub %o3, %o5, %o3
+ mov 1, %o2
+ b LOC(end_single_divloop)
+ nop
+ LOC(single_divloop):
+ sll %o2, 1, %o2
+ bl 1f
+ srl %o5, 1, %o5
+ ! %o3 >= 0
+ sub %o3, %o5, %o3
+ b 2f
+ add %o2, 1, %o2
+ 1: ! %o3 < 0
+ add %o3, %o5, %o3
+ sub %o2, 1, %o2
+ 2:
+ LOC(end_single_divloop):
+ subcc %g2, 1, %g2
+ bge LOC(single_divloop)
+ tst %o3
+ b,a LOC(end_regular_divide)
+
+LOC(not_really_big):
+1:
+ sll %o5, 4, %o5
+ cmp %o5, %o3
+ bleu 1b
+ addcc %o4, 1, %o4
+ be LOC(got_result)
+ sub %o4, 1, %o4
+
+ tst %o3 ! set up for initial iteration
+LOC(divloop):
+ sll %o2, 4, %o2
+ ! depth 1, accumulated bits 0
+ bl LOC(1.16)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ ! depth 2, accumulated bits 1
+ bl LOC(2.17)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ ! depth 3, accumulated bits 3
+ bl LOC(3.19)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ ! depth 4, accumulated bits 7
+ bl LOC(4.23)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ b 9f
+ add %o2, (7*2+1), %o2
+
+LOC(4.23):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ b 9f
+ add %o2, (7*2-1), %o2
+
+
+LOC(3.19):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ ! depth 4, accumulated bits 5
+ bl LOC(4.21)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ b 9f
+ add %o2, (5*2+1), %o2
+
+LOC(4.21):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ b 9f
+ add %o2, (5*2-1), %o2
+
+
+
+LOC(2.17):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ ! depth 3, accumulated bits 1
+ bl LOC(3.17)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ ! depth 4, accumulated bits 3
+ bl LOC(4.19)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ b 9f
+ add %o2, (3*2+1), %o2
+
+LOC(4.19):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ b 9f
+ add %o2, (3*2-1), %o2
+
+
+LOC(3.17):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ ! depth 4, accumulated bits 1
+ bl LOC(4.17)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ b 9f
+ add %o2, (1*2+1), %o2
+
+LOC(4.17):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ b 9f
+ add %o2, (1*2-1), %o2
+
+
+
+
+LOC(1.16):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ ! depth 2, accumulated bits -1
+ bl LOC(2.15)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ ! depth 3, accumulated bits -1
+ bl LOC(3.15)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ ! depth 4, accumulated bits -1
+ bl LOC(4.15)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ b 9f
+ add %o2, (-1*2+1), %o2
+
+LOC(4.15):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ b 9f
+ add %o2, (-1*2-1), %o2
+
+
+LOC(3.15):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ ! depth 4, accumulated bits -3
+ bl LOC(4.13)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ b 9f
+ add %o2, (-3*2+1), %o2
+
+LOC(4.13):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ b 9f
+ add %o2, (-3*2-1), %o2
+
+
+
+LOC(2.15):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ ! depth 3, accumulated bits -3
+ bl LOC(3.13)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ ! depth 4, accumulated bits -5
+ bl LOC(4.11)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ b 9f
+ add %o2, (-5*2+1), %o2
+
+LOC(4.11):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ b 9f
+ add %o2, (-5*2-1), %o2
+
+
+LOC(3.13):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ ! depth 4, accumulated bits -7
+ bl LOC(4.9)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ b 9f
+ add %o2, (-7*2+1), %o2
+
+LOC(4.9):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ b 9f
+ add %o2, (-7*2-1), %o2
+
+
+
+
+ 9:
+LOC(end_regular_divide):
+ subcc %o4, 1, %o4
+ bge LOC(divloop)
+ tst %o3
+ bl,a LOC(got_result)
+ ! non-restoring fixup here (one instruction only!)
+ sub %o2, 1, %o2
+
+
+LOC(got_result):
+ ! check to see if answer should be < 0
+ tst %g3
+ bl,a 1f
+ sub %g0, %o2, %o2
+1:
+ retl
+ mov %o2, %o0
+
+END(.div)
diff --git a/libc/sysdeps/linux/sparc/sparcv7/udiv.S b/libc/sysdeps/linux/sparc/sparcv7/udiv.S
new file mode 100644
index 000000000..56c64ad01
--- /dev/null
+++ b/libc/sysdeps/linux/sparc/sparcv7/udiv.S
@@ -0,0 +1,343 @@
+ /* This file is generated from divrem.m4; DO NOT EDIT! */
+/*
+ * Division and remainder, from Appendix E of the Sparc Version 8
+ * Architecture Manual, with fixes from Gordon Irlam.
+ */
+
+/*
+ * Input: dividend and divisor in %o0 and %o1 respectively.
+ *
+ * m4 parameters:
+ * .udiv name of function to generate
+ * div div=div => %o0 / %o1; div=rem => %o0 % %o1
+ * false false=true => signed; false=false => unsigned
+ *
+ * Algorithm parameters:
+ * N how many bits per iteration we try to get (4)
+ * WORDSIZE total number of bits (32)
+ *
+ * Derived constants:
+ * TOPBITS number of bits in the top decade of a number
+ *
+ * Important variables:
+ * Q the partial quotient under development (initially 0)
+ * R the remainder so far, initially the dividend
+ * ITER number of main division loop iterations required;
+ * equal to ceil(log2(quotient) / N). Note that this
+ * is the log base (2^N) of the quotient.
+ * V the current comparand, initially divisor*2^(ITER*N-1)
+ *
+ * Cost:
+ * Current estimate for non-large dividend is
+ * ceil(log2(quotient) / N) * (10 + 7N/2) + C
+ * A large dividend is one greater than 2^(31-TOPBITS) and takes a
+ * different path, as the upper bits of the quotient must be developed
+ * one bit at a time.
+ */
+
+
+
+ENTRY(.udiv)
+
+ ! Ready to divide. Compute size of quotient; scale comparand.
+ orcc %o1, %g0, %o5
+ bne 1f
+ mov %o0, %o3
+
+ ! Divide by zero trap. If it returns, return 0 (about as
+ ! wrong as possible, but that is what SunOS does...).
+ ta ST_DIV0
+ retl
+ clr %o0
+
+1:
+ cmp %o3, %o5 ! if %o1 exceeds %o0, done
+ blu LOC(got_result) ! (and algorithm fails otherwise)
+ clr %o2
+ sethi %hi(1 << (32 - 4 - 1)), %g1
+ cmp %o3, %g1
+ blu LOC(not_really_big)
+ clr %o4
+
+ ! Here the dividend is >= 2**(31-N) or so. We must be careful here,
+ ! as our usual N-at-a-shot divide step will cause overflow and havoc.
+ ! The number of bits in the result here is N*ITER+SC, where SC <= N.
+ ! Compute ITER in an unorthodox manner: know we need to shift V into
+ ! the top decade: so do not even bother to compare to R.
+ 1:
+ cmp %o5, %g1
+ bgeu 3f
+ mov 1, %g2
+ sll %o5, 4, %o5
+ b 1b
+ add %o4, 1, %o4
+
+ ! Now compute %g2.
+ 2: addcc %o5, %o5, %o5
+ bcc LOC(not_too_big)
+ add %g2, 1, %g2
+
+ ! We get here if the %o1 overflowed while shifting.
+ ! This means that %o3 has the high-order bit set.
+ ! Restore %o5 and subtract from %o3.
+ sll %g1, 4, %g1 ! high order bit
+ srl %o5, 1, %o5 ! rest of %o5
+ add %o5, %g1, %o5
+ b LOC(do_single_div)
+ sub %g2, 1, %g2
+
+ LOC(not_too_big):
+ 3: cmp %o5, %o3
+ blu 2b
+ nop
+ be LOC(do_single_div)
+ nop
+ /* NB: these are commented out in the V8-Sparc manual as well */
+ /* (I do not understand this) */
+ ! %o5 > %o3: went too far: back up 1 step
+ ! srl %o5, 1, %o5
+ ! dec %g2
+ ! do single-bit divide steps
+ !
+ ! We have to be careful here. We know that %o3 >= %o5, so we can do the
+ ! first divide step without thinking. BUT, the others are conditional,
+ ! and are only done if %o3 >= 0. Because both %o3 and %o5 may have the high-
+ ! order bit set in the first step, just falling into the regular
+ ! division loop will mess up the first time around.
+ ! So we unroll slightly...
+ LOC(do_single_div):
+ subcc %g2, 1, %g2
+ bl LOC(end_regular_divide)
+ nop
+ sub %o3, %o5, %o3
+ mov 1, %o2
+ b LOC(end_single_divloop)
+ nop
+ LOC(single_divloop):
+ sll %o2, 1, %o2
+ bl 1f
+ srl %o5, 1, %o5
+ ! %o3 >= 0
+ sub %o3, %o5, %o3
+ b 2f
+ add %o2, 1, %o2
+ 1: ! %o3 < 0
+ add %o3, %o5, %o3
+ sub %o2, 1, %o2
+ 2:
+ LOC(end_single_divloop):
+ subcc %g2, 1, %g2
+ bge LOC(single_divloop)
+ tst %o3
+ b,a LOC(end_regular_divide)
+
+LOC(not_really_big):
+1:
+ sll %o5, 4, %o5
+ cmp %o5, %o3
+ bleu 1b
+ addcc %o4, 1, %o4
+ be LOC(got_result)
+ sub %o4, 1, %o4
+
+ tst %o3 ! set up for initial iteration
+LOC(divloop):
+ sll %o2, 4, %o2
+ ! depth 1, accumulated bits 0
+ bl LOC(1.16)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ ! depth 2, accumulated bits 1
+ bl LOC(2.17)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ ! depth 3, accumulated bits 3
+ bl LOC(3.19)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ ! depth 4, accumulated bits 7
+ bl LOC(4.23)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ b 9f
+ add %o2, (7*2+1), %o2
+
+LOC(4.23):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ b 9f
+ add %o2, (7*2-1), %o2
+
+
+LOC(3.19):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ ! depth 4, accumulated bits 5
+ bl LOC(4.21)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ b 9f
+ add %o2, (5*2+1), %o2
+
+LOC(4.21):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ b 9f
+ add %o2, (5*2-1), %o2
+
+
+
+LOC(2.17):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ ! depth 3, accumulated bits 1
+ bl LOC(3.17)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ ! depth 4, accumulated bits 3
+ bl LOC(4.19)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ b 9f
+ add %o2, (3*2+1), %o2
+
+LOC(4.19):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ b 9f
+ add %o2, (3*2-1), %o2
+
+
+LOC(3.17):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ ! depth 4, accumulated bits 1
+ bl LOC(4.17)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ b 9f
+ add %o2, (1*2+1), %o2
+
+LOC(4.17):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ b 9f
+ add %o2, (1*2-1), %o2
+
+
+
+
+LOC(1.16):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ ! depth 2, accumulated bits -1
+ bl LOC(2.15)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ ! depth 3, accumulated bits -1
+ bl LOC(3.15)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ ! depth 4, accumulated bits -1
+ bl LOC(4.15)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ b 9f
+ add %o2, (-1*2+1), %o2
+
+LOC(4.15):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ b 9f
+ add %o2, (-1*2-1), %o2
+
+
+LOC(3.15):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ ! depth 4, accumulated bits -3
+ bl LOC(4.13)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ b 9f
+ add %o2, (-3*2+1), %o2
+
+LOC(4.13):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ b 9f
+ add %o2, (-3*2-1), %o2
+
+
+
+LOC(2.15):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ ! depth 3, accumulated bits -3
+ bl LOC(3.13)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ ! depth 4, accumulated bits -5
+ bl LOC(4.11)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ b 9f
+ add %o2, (-5*2+1), %o2
+
+LOC(4.11):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ b 9f
+ add %o2, (-5*2-1), %o2
+
+
+LOC(3.13):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ ! depth 4, accumulated bits -7
+ bl LOC(4.9)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ b 9f
+ add %o2, (-7*2+1), %o2
+
+LOC(4.9):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ b 9f
+ add %o2, (-7*2-1), %o2
+
+
+
+
+ 9:
+LOC(end_regular_divide):
+ subcc %o4, 1, %o4
+ bge LOC(divloop)
+ tst %o3
+ bl,a LOC(got_result)
+ ! non-restoring fixup here (one instruction only!)
+ sub %o2, 1, %o2
+
+
+LOC(got_result):
+
+ retl
+ mov %o2, %o0
+
+END(.udiv)
diff --git a/libc/sysdeps/linux/sparc/sparcv7/umul.S b/libc/sysdeps/linux/sparc/sparcv7/umul.S
new file mode 100644
index 000000000..50b3157db
--- /dev/null
+++ b/libc/sysdeps/linux/sparc/sparcv7/umul.S
@@ -0,0 +1,153 @@
+/*
+ * Unsigned multiply. Returns %o0 * %o1 in %o1%o0 (i.e., %o1 holds the
+ * upper 32 bits of the 64-bit product).
+ *
+ * This code optimizes short (less than 13-bit) multiplies. Short
+ * multiplies require 25 instruction cycles, and long ones require
+ * 45 instruction cycles.
+ *
+ * On return, overflow has occurred (%o1 is not zero) if and only if
+ * the Z condition code is clear, allowing, e.g., the following:
+ *
+ * call .umul
+ * nop
+ * bnz overflow (or tnz)
+ */
+
+ENTRY(.umul)
+ or %o0, %o1, %o4
+ mov %o0, %y ! multiplier -> Y
+ andncc %o4, 0xfff, %g0 ! test bits 12..31 of *both* args
+ be LOC(mul_shortway) ! if zero, can do it the short way
+ andcc %g0, %g0, %o4 ! zero the partial product; clear N & V
+
+ /*
+ * Long multiply. 32 steps, followed by a final shift step.
+ */
+ mulscc %o4, %o1, %o4 ! 1
+ mulscc %o4, %o1, %o4 ! 2
+ mulscc %o4, %o1, %o4 ! 3
+ mulscc %o4, %o1, %o4 ! 4
+ mulscc %o4, %o1, %o4 ! 5
+ mulscc %o4, %o1, %o4 ! 6
+ mulscc %o4, %o1, %o4 ! 7
+ mulscc %o4, %o1, %o4 ! 8
+ mulscc %o4, %o1, %o4 ! 9
+ mulscc %o4, %o1, %o4 ! 10
+ mulscc %o4, %o1, %o4 ! 11
+ mulscc %o4, %o1, %o4 ! 12
+ mulscc %o4, %o1, %o4 ! 13
+ mulscc %o4, %o1, %o4 ! 14
+ mulscc %o4, %o1, %o4 ! 15
+ mulscc %o4, %o1, %o4 ! 16
+ mulscc %o4, %o1, %o4 ! 17
+ mulscc %o4, %o1, %o4 ! 18
+ mulscc %o4, %o1, %o4 ! 19
+ mulscc %o4, %o1, %o4 ! 20
+ mulscc %o4, %o1, %o4 ! 21
+ mulscc %o4, %o1, %o4 ! 22
+ mulscc %o4, %o1, %o4 ! 23
+ mulscc %o4, %o1, %o4 ! 24
+ mulscc %o4, %o1, %o4 ! 25
+ mulscc %o4, %o1, %o4 ! 26
+ mulscc %o4, %o1, %o4 ! 27
+ mulscc %o4, %o1, %o4 ! 28
+ mulscc %o4, %o1, %o4 ! 29
+ mulscc %o4, %o1, %o4 ! 30
+ mulscc %o4, %o1, %o4 ! 31
+ mulscc %o4, %o1, %o4 ! 32
+ mulscc %o4, %g0, %o4 ! final shift
+
+ /*
+ * Normally, with the shift-and-add approach, if both numbers are
+ * positive you get the correct result. With 32-bit two's-complement
+ * numbers, -x is represented as
+ *
+ * x 32
+ * ( 2 - ------ ) mod 2 * 2
+ * 32
+ * 2
+ *
+ * (the `mod 2' subtracts 1 from 1.bbbb). To avoid lots of 2^32s,
+ * we can treat this as if the radix point were just to the left
+ * of the sign bit (multiply by 2^32), and get
+ *
+ * -x = (2 - x) mod 2
+ *
+ * Then, ignoring the `mod 2's for convenience:
+ *
+ * x * y = xy
+ * -x * y = 2y - xy
+ * x * -y = 2x - xy
+ * -x * -y = 4 - 2x - 2y + xy
+ *
+ * For signed multiplies, we subtract (x << 32) from the partial
+ * product to fix this problem for negative multipliers (see mul.s).
+ * Because of the way the shift into the partial product is calculated
+ * (N xor V), this term is automatically removed for the multiplicand,
+ * so we don't have to adjust.
+ *
+ * But for unsigned multiplies, the high order bit wasn't a sign bit,
+ * and the correction is wrong. So for unsigned multiplies where the
+ * high order bit is one, we end up with xy - (y << 32). To fix it
+ * we add y << 32.
+ */
+#if 0
+ tst %o1
+ bl,a 1f ! if %o1 < 0 (high order bit = 1),
+ add %o4, %o0, %o4 ! %o4 += %o0 (add y to upper half)
+1: rd %y, %o0 ! get lower half of product
+ retl
+ addcc %o4, %g0, %o1 ! put upper half in place and set Z for %o1==0
+#else
+ /* Faster code from tege@sics.se. */
+ sra %o1, 31, %o2 ! make mask from sign bit
+ and %o0, %o2, %o2 ! %o2 = 0 or %o0, depending on sign of %o1
+ rd %y, %o0 ! get lower half of product
+ retl
+ addcc %o4, %o2, %o1 ! add compensation and put upper half in place
+#endif
+
+LOC(mul_shortway):
+ /*
+ * Short multiply. 12 steps, followed by a final shift step.
+ * The resulting bits are off by 12 and (32-12) = 20 bit positions,
+ * but there is no problem with %o0 being negative (unlike above),
+ * and overflow is impossible (the answer is at most 24 bits long).
+ */
+ mulscc %o4, %o1, %o4 ! 1
+ mulscc %o4, %o1, %o4 ! 2
+ mulscc %o4, %o1, %o4 ! 3
+ mulscc %o4, %o1, %o4 ! 4
+ mulscc %o4, %o1, %o4 ! 5
+ mulscc %o4, %o1, %o4 ! 6
+ mulscc %o4, %o1, %o4 ! 7
+ mulscc %o4, %o1, %o4 ! 8
+ mulscc %o4, %o1, %o4 ! 9
+ mulscc %o4, %o1, %o4 ! 10
+ mulscc %o4, %o1, %o4 ! 11
+ mulscc %o4, %o1, %o4 ! 12
+ mulscc %o4, %g0, %o4 ! final shift
+
+ /*
+ * %o4 has 20 of the bits that should be in the result; %y has
+ * the bottom 12 (as %y's top 12). That is:
+ *
+ * %o4 %y
+ * +----------------+----------------+
+ * | -12- | -20- | -12- | -20- |
+ * +------(---------+------)---------+
+ * -----result-----
+ *
+ * The 12 bits of %o4 left of the `result' area are all zero;
+ * in fact, all top 20 bits of %o4 are zero.
+ */
+
+ rd %y, %o5
+ sll %o4, 12, %o0 ! shift middle bits left 12
+ srl %o5, 20, %o5 ! shift low bits right 20
+ or %o5, %o0, %o0
+ retl
+ addcc %g0, %g0, %o1 ! %o1 = zero, and set Z
+
+END(.umul)
diff --git a/libc/sysdeps/linux/sparc/sparcv7/urem.S b/libc/sysdeps/linux/sparc/sparcv7/urem.S
new file mode 100644
index 000000000..ecf34672a
--- /dev/null
+++ b/libc/sysdeps/linux/sparc/sparcv7/urem.S
@@ -0,0 +1,343 @@
+ /* This file is generated from divrem.m4; DO NOT EDIT! */
+/*
+ * Division and remainder, from Appendix E of the Sparc Version 8
+ * Architecture Manual, with fixes from Gordon Irlam.
+ */
+
+/*
+ * Input: dividend and divisor in %o0 and %o1 respectively.
+ *
+ * m4 parameters:
+ * .urem name of function to generate
+ * rem rem=div => %o0 / %o1; rem=rem => %o0 % %o1
+ * false false=true => signed; false=false => unsigned
+ *
+ * Algorithm parameters:
+ * N how many bits per iteration we try to get (4)
+ * WORDSIZE total number of bits (32)
+ *
+ * Derived constants:
+ * TOPBITS number of bits in the top decade of a number
+ *
+ * Important variables:
+ * Q the partial quotient under development (initially 0)
+ * R the remainder so far, initially the dividend
+ * ITER number of main division loop iterations required;
+ * equal to ceil(log2(quotient) / N). Note that this
+ * is the log base (2^N) of the quotient.
+ * V the current comparand, initially divisor*2^(ITER*N-1)
+ *
+ * Cost:
+ * Current estimate for non-large dividend is
+ * ceil(log2(quotient) / N) * (10 + 7N/2) + C
+ * A large dividend is one greater than 2^(31-TOPBITS) and takes a
+ * different path, as the upper bits of the quotient must be developed
+ * one bit at a time.
+ */
+
+
+
+ENTRY(.urem)
+
+ ! Ready to divide. Compute size of quotient; scale comparand.
+ orcc %o1, %g0, %o5
+ bne 1f
+ mov %o0, %o3
+
+ ! Divide by zero trap. If it returns, return 0 (about as
+ ! wrong as possible, but that is what SunOS does...).
+ ta ST_DIV0
+ retl
+ clr %o0
+
+1:
+ cmp %o3, %o5 ! if %o1 exceeds %o0, done
+ blu LOC(got_result) ! (and algorithm fails otherwise)
+ clr %o2
+ sethi %hi(1 << (32 - 4 - 1)), %g1
+ cmp %o3, %g1
+ blu LOC(not_really_big)
+ clr %o4
+
+ ! Here the dividend is >= 2**(31-N) or so. We must be careful here,
+ ! as our usual N-at-a-shot divide step will cause overflow and havoc.
+ ! The number of bits in the result here is N*ITER+SC, where SC <= N.
+ ! Compute ITER in an unorthodox manner: know we need to shift V into
+ ! the top decade: so do not even bother to compare to R.
+ 1:
+ cmp %o5, %g1
+ bgeu 3f
+ mov 1, %g2
+ sll %o5, 4, %o5
+ b 1b
+ add %o4, 1, %o4
+
+ ! Now compute %g2.
+ 2: addcc %o5, %o5, %o5
+ bcc LOC(not_too_big)
+ add %g2, 1, %g2
+
+ ! We get here if the %o1 overflowed while shifting.
+ ! This means that %o3 has the high-order bit set.
+ ! Restore %o5 and subtract from %o3.
+ sll %g1, 4, %g1 ! high order bit
+ srl %o5, 1, %o5 ! rest of %o5
+ add %o5, %g1, %o5
+ b LOC(do_single_div)
+ sub %g2, 1, %g2
+
+ LOC(not_too_big):
+ 3: cmp %o5, %o3
+ blu 2b
+ nop
+ be LOC(do_single_div)
+ nop
+ /* NB: these are commented out in the V8-Sparc manual as well */
+ /* (I do not understand this) */
+ ! %o5 > %o3: went too far: back up 1 step
+ ! srl %o5, 1, %o5
+ ! dec %g2
+ ! do single-bit divide steps
+ !
+ ! We have to be careful here. We know that %o3 >= %o5, so we can do the
+ ! first divide step without thinking. BUT, the others are conditional,
+ ! and are only done if %o3 >= 0. Because both %o3 and %o5 may have the high-
+ ! order bit set in the first step, just falling into the regular
+ ! division loop will mess up the first time around.
+ ! So we unroll slightly...
+ LOC(do_single_div):
+ subcc %g2, 1, %g2
+ bl LOC(end_regular_divide)
+ nop
+ sub %o3, %o5, %o3
+ mov 1, %o2
+ b LOC(end_single_divloop)
+ nop
+ LOC(single_divloop):
+ sll %o2, 1, %o2
+ bl 1f
+ srl %o5, 1, %o5
+ ! %o3 >= 0
+ sub %o3, %o5, %o3
+ b 2f
+ add %o2, 1, %o2
+ 1: ! %o3 < 0
+ add %o3, %o5, %o3
+ sub %o2, 1, %o2
+ 2:
+ LOC(end_single_divloop):
+ subcc %g2, 1, %g2
+ bge LOC(single_divloop)
+ tst %o3
+ b,a LOC(end_regular_divide)
+
+LOC(not_really_big):
+1:
+ sll %o5, 4, %o5
+ cmp %o5, %o3
+ bleu 1b
+ addcc %o4, 1, %o4
+ be LOC(got_result)
+ sub %o4, 1, %o4
+
+ tst %o3 ! set up for initial iteration
+LOC(divloop):
+ sll %o2, 4, %o2
+ ! depth 1, accumulated bits 0
+ bl LOC(1.16)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ ! depth 2, accumulated bits 1
+ bl LOC(2.17)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ ! depth 3, accumulated bits 3
+ bl LOC(3.19)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ ! depth 4, accumulated bits 7
+ bl LOC(4.23)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ b 9f
+ add %o2, (7*2+1), %o2
+
+LOC(4.23):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ b 9f
+ add %o2, (7*2-1), %o2
+
+
+LOC(3.19):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ ! depth 4, accumulated bits 5
+ bl LOC(4.21)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ b 9f
+ add %o2, (5*2+1), %o2
+
+LOC(4.21):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ b 9f
+ add %o2, (5*2-1), %o2
+
+
+
+LOC(2.17):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ ! depth 3, accumulated bits 1
+ bl LOC(3.17)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ ! depth 4, accumulated bits 3
+ bl LOC(4.19)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ b 9f
+ add %o2, (3*2+1), %o2
+
+LOC(4.19):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ b 9f
+ add %o2, (3*2-1), %o2
+
+
+LOC(3.17):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ ! depth 4, accumulated bits 1
+ bl LOC(4.17)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ b 9f
+ add %o2, (1*2+1), %o2
+
+LOC(4.17):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ b 9f
+ add %o2, (1*2-1), %o2
+
+
+
+
+LOC(1.16):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ ! depth 2, accumulated bits -1
+ bl LOC(2.15)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ ! depth 3, accumulated bits -1
+ bl LOC(3.15)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ ! depth 4, accumulated bits -1
+ bl LOC(4.15)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ b 9f
+ add %o2, (-1*2+1), %o2
+
+LOC(4.15):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ b 9f
+ add %o2, (-1*2-1), %o2
+
+
+LOC(3.15):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ ! depth 4, accumulated bits -3
+ bl LOC(4.13)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ b 9f
+ add %o2, (-3*2+1), %o2
+
+LOC(4.13):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ b 9f
+ add %o2, (-3*2-1), %o2
+
+
+
+LOC(2.15):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ ! depth 3, accumulated bits -3
+ bl LOC(3.13)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ ! depth 4, accumulated bits -5
+ bl LOC(4.11)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ b 9f
+ add %o2, (-5*2+1), %o2
+
+LOC(4.11):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ b 9f
+ add %o2, (-5*2-1), %o2
+
+
+LOC(3.13):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ ! depth 4, accumulated bits -7
+ bl LOC(4.9)
+ srl %o5,1,%o5
+ ! remainder is positive
+ subcc %o3,%o5,%o3
+ b 9f
+ add %o2, (-7*2+1), %o2
+
+LOC(4.9):
+ ! remainder is negative
+ addcc %o3,%o5,%o3
+ b 9f
+ add %o2, (-7*2-1), %o2
+
+
+
+
+ 9:
+LOC(end_regular_divide):
+ subcc %o4, 1, %o4
+ bge LOC(divloop)
+ tst %o3
+ bl,a LOC(got_result)
+ ! non-restoring fixup here (one instruction only!)
+ add %o3, %o1, %o3
+
+
+LOC(got_result):
+
+ retl
+ mov %o3, %o0
+
+END(.urem)
diff --git a/libc/sysdeps/linux/sparc/sparcv8/rem.S b/libc/sysdeps/linux/sparc/sparcv8/rem.S
new file mode 100644
index 000000000..c4faebe88
--- /dev/null
+++ b/libc/sysdeps/linux/sparc/sparcv8/rem.S
@@ -0,0 +1,19 @@
+/*
+ * Sparc v8 has divide.
+ */
+
+ENTRY(.rem)
+
+ sra %o0, 31, %o2
+ wr %o2, 0, %y
+ nop
+ nop
+ nop
+ sdivcc %o0, %o1, %o2
+ bvs,a 1f
+ xnor %o2, %g0, %o2
+1: smul %o2, %o1, %o2
+ retl
+ sub %o0, %o2, %o0
+
+END(.rem)
diff --git a/libc/sysdeps/linux/sparc/sparcv8/sdiv.S b/libc/sysdeps/linux/sparc/sparcv8/sdiv.S
new file mode 100644
index 000000000..4ac901a77
--- /dev/null
+++ b/libc/sysdeps/linux/sparc/sparcv8/sdiv.S
@@ -0,0 +1,18 @@
+/*
+ * Sparc v8 has divide.
+ */
+
+ENTRY(.div)
+
+ sra %o0, 31, %o2
+ wr %o2, 0, %y
+ nop
+ nop
+ nop
+ sdivcc %o0, %o1, %o0
+ bvs,a 1f
+ xnor %o0, %g0, %o0
+1: retl
+ nop
+
+END(.div)
diff --git a/libc/sysdeps/linux/sparc/sparcv8/udiv.S b/libc/sysdeps/linux/sparc/sparcv8/udiv.S
new file mode 100644
index 000000000..d5d93bb8f
--- /dev/null
+++ b/libc/sysdeps/linux/sparc/sparcv8/udiv.S
@@ -0,0 +1,13 @@
+/*
+ * Sparc v8 has divide.
+ */
+
+ENTRY(.udiv)
+
+ wr %g0, 0, %y
+ nop
+ nop
+ retl
+ udiv %o0, %o1, %o0
+
+END(.udiv)
diff --git a/libc/sysdeps/linux/sparc/sparcv8/umul.S b/libc/sysdeps/linux/sparc/sparcv8/umul.S
new file mode 100644
index 000000000..47b98e9ca
--- /dev/null
+++ b/libc/sysdeps/linux/sparc/sparcv8/umul.S
@@ -0,0 +1,11 @@
+/*
+ * Sparc v8 has multiply.
+ */
+
+ENTRY(.umul)
+
+ umul %o0, %o1, %o0
+ retl
+ rd %y, %o1
+
+END(.umul)
diff --git a/libc/sysdeps/linux/sparc/sparcv8/urem.S b/libc/sysdeps/linux/sparc/sparcv8/urem.S
new file mode 100644
index 000000000..0e96246f5
--- /dev/null
+++ b/libc/sysdeps/linux/sparc/sparcv8/urem.S
@@ -0,0 +1,16 @@
+/*
+ * Sparc v8 has divide.
+ */
+
+ENTRY(.urem)
+
+ wr %g0, 0, %y
+ nop
+ nop
+ nop
+ udiv %o0, %o1, %o2
+ umul %o2, %o1, %o2
+ retl
+ sub %o0, %o2, %o0
+
+END(.urem)
diff --git a/libc/sysdeps/linux/sparc/sparcv9/rem.S b/libc/sysdeps/linux/sparc/sparcv9/rem.S
new file mode 100644
index 000000000..1474e32ae
--- /dev/null
+++ b/libc/sysdeps/linux/sparc/sparcv9/rem.S
@@ -0,0 +1,20 @@
+/*
+ * Sparc v9 has divide.
+ * As divx takes 68 cycles and sdivcc only 36,
+ * we use sdivcc eventhough it is deprecated.
+ */
+
+ .text
+ .align 32
+ENTRY(.rem)
+
+ sra %o0, 31, %o2
+ wr %o2, 0, %y
+ sdivcc %o0, %o1, %o2
+ xnor %o2, %g0, %o3
+ movvs %icc, %o3, %o2
+ smul %o2, %o1, %o2
+ retl
+ sub %o0, %o2, %o0
+
+END(.rem)
diff --git a/libc/sysdeps/linux/sparc/sparcv9/sdiv.S b/libc/sysdeps/linux/sparc/sparcv9/sdiv.S
new file mode 100644
index 000000000..45535bb68
--- /dev/null
+++ b/libc/sysdeps/linux/sparc/sparcv9/sdiv.S
@@ -0,0 +1,18 @@
+/*
+ * Sparc v9 has divide.
+ * As divx takes 68 cycles and sdivcc only 36,
+ * we use sdivcc eventhough it is deprecated.
+ */
+
+ .text
+ .align 32
+ENTRY(.div)
+
+ sra %o0, 31, %o2
+ wr %o2, 0, %y
+ sdivcc %o0, %o1, %o0
+ xnor %o0, %g0, %o2
+ retl
+ movvs %icc, %o2, %o0
+
+END(.div)
diff --git a/libc/sysdeps/linux/sparc/sparcv9/udiv.S b/libc/sysdeps/linux/sparc/sparcv9/udiv.S
new file mode 100644
index 000000000..303f29bdf
--- /dev/null
+++ b/libc/sysdeps/linux/sparc/sparcv9/udiv.S
@@ -0,0 +1,15 @@
+/*
+ * Sparc v9 has divide.
+ * As divx takes 68 cycles and udiv only 37,
+ * we use udiv eventhough it is deprecated.
+ */
+
+ .text
+ .align 32
+ENTRY(.udiv)
+
+ wr %g0, 0, %y
+ retl
+ udiv %o0, %o1, %o0
+
+END(.udiv)
diff --git a/libc/sysdeps/linux/sparc/sparcv9/umul.S b/libc/sysdeps/linux/sparc/sparcv9/umul.S
new file mode 100644
index 000000000..e65e4b95f
--- /dev/null
+++ b/libc/sysdeps/linux/sparc/sparcv9/umul.S
@@ -0,0 +1,15 @@
+/*
+ * Sparc v9 has multiply.
+ */
+
+ .text
+ .align 32
+ENTRY(.umul)
+
+ srl %o0, 0, %o0
+ srl %o1, 0, %o1
+ mulx %o0, %o1, %o0
+ retl
+ srlx %o0, 32, %o1
+
+END(.umul)
diff --git a/libc/sysdeps/linux/sparc/sparcv9/urem.S b/libc/sysdeps/linux/sparc/sparcv9/urem.S
new file mode 100644
index 000000000..93542698d
--- /dev/null
+++ b/libc/sysdeps/linux/sparc/sparcv9/urem.S
@@ -0,0 +1,17 @@
+/*
+ * Sparc v9 has divide.
+ * As divx takes 68 cycles and udiv only 37,
+ * we use udiv eventhough it is deprecated.
+ */
+
+ .text
+ .align 32
+ENTRY(.urem)
+
+ wr %g0, 0, %y
+ udiv %o0, %o1, %o2
+ umul %o2, %o1, %o2
+ retl
+ sub %o0, %o2, %o0
+
+END(.urem)
diff --git a/libc/sysdeps/linux/sparc/udiv.S b/libc/sysdeps/linux/sparc/udiv.S
index 85eeb40fc..a1355a761 100644
--- a/libc/sysdeps/linux/sparc/udiv.S
+++ b/libc/sysdeps/linux/sparc/udiv.S
@@ -1,348 +1,9 @@
- /* This file is generated from divrem.m4; DO NOT EDIT! */
-/*
- * Division and remainder, from Appendix E of the Sparc Version 8
- * Architecture Manual, with fixes from Gordon Irlam.
- */
-
-/*
- * Input: dividend and divisor in %o0 and %o1 respectively.
- *
- * m4 parameters:
- * .udiv name of function to generate
- * div div=div => %o0 / %o1; div=rem => %o0 % %o1
- * false false=true => signed; false=false => unsigned
- *
- * Algorithm parameters:
- * N how many bits per iteration we try to get (4)
- * WORDSIZE total number of bits (32)
- *
- * Derived constants:
- * TOPBITS number of bits in the top decade of a number
- *
- * Important variables:
- * Q the partial quotient under development (initially 0)
- * R the remainder so far, initially the dividend
- * ITER number of main division loop iterations required;
- * equal to ceil(log2(quotient) / N). Note that this
- * is the log base (2^N) of the quotient.
- * V the current comparand, initially divisor*2^(ITER*N-1)
- *
- * Cost:
- * Current estimate for non-large dividend is
- * ceil(log2(quotient) / N) * (10 + 7N/2) + C
- * A large dividend is one greater than 2^(31-TOPBITS) and takes a
- * different path, as the upper bits of the quotient must be developed
- * one bit at a time.
- */
-
-
-
-#include <sys/syscall.h>
-
-.global .udiv;
-.align 4;
-.type .udiv ,@function;
-
-.udiv:
- ! Ready to divide. Compute size of quotient; scale comparand.
- orcc %o1, %g0, %o5
- bne 1f
- mov %o0, %o3
-
- ! Divide by zero trap. If it returns, return 0 (about as
- ! wrong as possible, but that is what SunOS does...).
- ta 0x02
- retl
- clr %o0
-
-1:
- cmp %o3, %o5 ! if %o1 exceeds %o0, done
- blu .Lgot_result ! (and algorithm fails otherwise)
- clr %o2
- sethi %hi(1 << (32 - 4 - 1)), %g1
- cmp %o3, %g1
- blu .Lnot_really_big
- clr %o4
-
- ! Here the dividend is >= 2**(31-N) or so. We must be careful here,
- ! as our usual N-at-a-shot divide step will cause overflow and havoc.
- ! The number of bits in the result here is N*ITER+SC, where SC <= N.
- ! Compute ITER in an unorthodox manner: know we need to shift V into
- ! the top decade: so do not even bother to compare to R.
- 1:
- cmp %o5, %g1
- bgeu 3f
- mov 1, %g2
- sll %o5, 4, %o5
- b 1b
- add %o4, 1, %o4
-
- ! Now compute %g2.
- 2: addcc %o5, %o5, %o5
- bcc .Lnot_too_big
- add %g2, 1, %g2
-
- ! We get here if the %o1 overflowed while shifting.
- ! This means that %o3 has the high-order bit set.
- ! Restore %o5 and subtract from %o3.
- sll %g1, 4, %g1 ! high order bit
- srl %o5, 1, %o5 ! rest of %o5
- add %o5, %g1, %o5
- b .Ldo_single_div
- sub %g2, 1, %g2
-
- .Lnot_too_big:
- 3: cmp %o5, %o3
- blu 2b
- nop
- be .Ldo_single_div
- nop
- /* NB: these are commented out in the V8-Sparc manual as well */
- /* (I do not understand this) */
- ! %o5 > %o3: went too far: back up 1 step
- ! srl %o5, 1, %o5
- ! dec %g2
- ! do single-bit divide steps
- !
- ! We have to be careful here. We know that %o3 >= %o5, so we can do the
- ! first divide step without thinking. BUT, the others are conditional,
- ! and are only done if %o3 >= 0. Because both %o3 and %o5 may have the high-
- ! order bit set in the first step, just falling into the regular
- ! division loop will mess up the first time around.
- ! So we unroll slightly...
- .Ldo_single_div:
- subcc %g2, 1, %g2
- bl .Lend_regular_divide
- nop
- sub %o3, %o5, %o3
- mov 1, %o2
- b .Lend_single_divloop
- nop
- .Lsingle_divloop:
- sll %o2, 1, %o2
- bl 1f
- srl %o5, 1, %o5
- ! %o3 >= 0
- sub %o3, %o5, %o3
- b 2f
- add %o2, 1, %o2
- 1: ! %o3 < 0
- add %o3, %o5, %o3
- sub %o2, 1, %o2
- 2:
- .Lend_single_divloop:
- subcc %g2, 1, %g2
- bge .Lsingle_divloop
- tst %o3
- b,a .Lend_regular_divide
-
-.Lnot_really_big:
-1:
- sll %o5, 4, %o5
- cmp %o5, %o3
- bleu 1b
- addcc %o4, 1, %o4
- be .Lgot_result
- sub %o4, 1, %o4
-
- tst %o3 ! set up for initial iteration
-.Ldivloop:
- sll %o2, 4, %o2
- ! depth 1, accumulated bits 0
- bl .L1.16
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- ! depth 2, accumulated bits 1
- bl .L2.17
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- ! depth 3, accumulated bits 3
- bl .L3.19
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- ! depth 4, accumulated bits 7
- bl .L4.23
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- b 9f
- add %o2, (7*2+1), %o2
-
-.L4.23:
- ! remainder is negative
- addcc %o3,%o5,%o3
- b 9f
- add %o2, (7*2-1), %o2
-
-
-.L3.19:
- ! remainder is negative
- addcc %o3,%o5,%o3
- ! depth 4, accumulated bits 5
- bl .L4.21
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- b 9f
- add %o2, (5*2+1), %o2
-
-.L4.21:
- ! remainder is negative
- addcc %o3,%o5,%o3
- b 9f
- add %o2, (5*2-1), %o2
-
-
-
-.L2.17:
- ! remainder is negative
- addcc %o3,%o5,%o3
- ! depth 3, accumulated bits 1
- bl .L3.17
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- ! depth 4, accumulated bits 3
- bl .L4.19
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- b 9f
- add %o2, (3*2+1), %o2
-
-.L4.19:
- ! remainder is negative
- addcc %o3,%o5,%o3
- b 9f
- add %o2, (3*2-1), %o2
-
-
-.L3.17:
- ! remainder is negative
- addcc %o3,%o5,%o3
- ! depth 4, accumulated bits 1
- bl .L4.17
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- b 9f
- add %o2, (1*2+1), %o2
-
-.L4.17:
- ! remainder is negative
- addcc %o3,%o5,%o3
- b 9f
- add %o2, (1*2-1), %o2
-
-
-
-
-.L1.16:
- ! remainder is negative
- addcc %o3,%o5,%o3
- ! depth 2, accumulated bits -1
- bl .L2.15
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- ! depth 3, accumulated bits -1
- bl .L3.15
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- ! depth 4, accumulated bits -1
- bl .L4.15
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- b 9f
- add %o2, (-1*2+1), %o2
-
-.L4.15:
- ! remainder is negative
- addcc %o3,%o5,%o3
- b 9f
- add %o2, (-1*2-1), %o2
-
-
-.L3.15:
- ! remainder is negative
- addcc %o3,%o5,%o3
- ! depth 4, accumulated bits -3
- bl .L4.13
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- b 9f
- add %o2, (-3*2+1), %o2
-
-.L4.13:
- ! remainder is negative
- addcc %o3,%o5,%o3
- b 9f
- add %o2, (-3*2-1), %o2
-
-
-
-.L2.15:
- ! remainder is negative
- addcc %o3,%o5,%o3
- ! depth 3, accumulated bits -3
- bl .L3.13
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- ! depth 4, accumulated bits -5
- bl .L4.11
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- b 9f
- add %o2, (-5*2+1), %o2
-
-.L4.11:
- ! remainder is negative
- addcc %o3,%o5,%o3
- b 9f
- add %o2, (-5*2-1), %o2
-
-
-.L3.13:
- ! remainder is negative
- addcc %o3,%o5,%o3
- ! depth 4, accumulated bits -7
- bl .L4.9
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- b 9f
- add %o2, (-7*2+1), %o2
-
-.L4.9:
- ! remainder is negative
- addcc %o3,%o5,%o3
- b 9f
- add %o2, (-7*2-1), %o2
-
-
-
-
- 9:
-.Lend_regular_divide:
- subcc %o4, 1, %o4
- bge .Ldivloop
- tst %o3
- bl,a .Lgot_result
- ! non-restoring fixup here (one instruction only!)
- sub %o2, 1, %o2
-
-
-.Lgot_result:
-
- retl
- mov %o2, %o0
-
-.size .udiv,.-.udiv;
+#include "_math_inc.h"
+
+#if defined(__CONFIG_SPARC_V9__) || defined(__CONFIG_SPARC_V9B__)
+# include "sparcv9/udiv.S"
+#elif defined(__CONFIG_SPARC_V8__)
+# include "sparcv8/udiv.S"
+#else
+# include "sparcv7/udiv.S"
+#endif
diff --git a/libc/sysdeps/linux/sparc/umul.S b/libc/sysdeps/linux/sparc/umul.S
index 4f38d78eb..e86059743 100644
--- a/libc/sysdeps/linux/sparc/umul.S
+++ b/libc/sysdeps/linux/sparc/umul.S
@@ -1,160 +1,9 @@
-/*
- * Unsigned multiply. Returns %o0 * %o1 in %o1%o0 (i.e., %o1 holds the
- * upper 32 bits of the 64-bit product).
- *
- * This code optimizes short (less than 13-bit) multiplies. Short
- * multiplies require 25 instruction cycles, and long ones require
- * 45 instruction cycles.
- *
- * On return, overflow has occurred (%o1 is not zero) if and only if
- * the Z condition code is clear, allowing, e.g., the following:
- *
- * call .umul
- * nop
- * bnz overflow (or tnz)
- */
+#include "_math_inc.h"
-#include <sys/syscall.h>
-
-
-.global .umul;
-.align 4;
-.type .umul ,@function;
-
-.umul:
- or %o0, %o1, %o4
- mov %o0, %y ! multiplier -> Y
- andncc %o4, 0xfff, %g0 ! test bits 12..31 of *both* args
- be .Lmul_shortway ! if zero, can do it the short way
- andcc %g0, %g0, %o4 ! zero the partial product; clear N & V
-
- /*
- * Long multiply. 32 steps, followed by a final shift step.
- */
- mulscc %o4, %o1, %o4 ! 1
- mulscc %o4, %o1, %o4 ! 2
- mulscc %o4, %o1, %o4 ! 3
- mulscc %o4, %o1, %o4 ! 4
- mulscc %o4, %o1, %o4 ! 5
- mulscc %o4, %o1, %o4 ! 6
- mulscc %o4, %o1, %o4 ! 7
- mulscc %o4, %o1, %o4 ! 8
- mulscc %o4, %o1, %o4 ! 9
- mulscc %o4, %o1, %o4 ! 10
- mulscc %o4, %o1, %o4 ! 11
- mulscc %o4, %o1, %o4 ! 12
- mulscc %o4, %o1, %o4 ! 13
- mulscc %o4, %o1, %o4 ! 14
- mulscc %o4, %o1, %o4 ! 15
- mulscc %o4, %o1, %o4 ! 16
- mulscc %o4, %o1, %o4 ! 17
- mulscc %o4, %o1, %o4 ! 18
- mulscc %o4, %o1, %o4 ! 19
- mulscc %o4, %o1, %o4 ! 20
- mulscc %o4, %o1, %o4 ! 21
- mulscc %o4, %o1, %o4 ! 22
- mulscc %o4, %o1, %o4 ! 23
- mulscc %o4, %o1, %o4 ! 24
- mulscc %o4, %o1, %o4 ! 25
- mulscc %o4, %o1, %o4 ! 26
- mulscc %o4, %o1, %o4 ! 27
- mulscc %o4, %o1, %o4 ! 28
- mulscc %o4, %o1, %o4 ! 29
- mulscc %o4, %o1, %o4 ! 30
- mulscc %o4, %o1, %o4 ! 31
- mulscc %o4, %o1, %o4 ! 32
- mulscc %o4, %g0, %o4 ! final shift
-
- /*
- * Normally, with the shift-and-add approach, if both numbers are
- * positive you get the correct result. With 32-bit two's-complement
- * numbers, -x is represented as
- *
- * x 32
- * ( 2 - ------ ) mod 2 * 2
- * 32
- * 2
- *
- * (the `mod 2' subtracts 1 from 1.bbbb). To avoid lots of 2^32s,
- * we can treat this as if the radix point were just to the left
- * of the sign bit (multiply by 2^32), and get
- *
- * -x = (2 - x) mod 2
- *
- * Then, ignoring the `mod 2's for convenience:
- *
- * x * y = xy
- * -x * y = 2y - xy
- * x * -y = 2x - xy
- * -x * -y = 4 - 2x - 2y + xy
- *
- * For signed multiplies, we subtract (x << 32) from the partial
- * product to fix this problem for negative multipliers (see mul.s).
- * Because of the way the shift into the partial product is calculated
- * (N xor V), this term is automatically removed for the multiplicand,
- * so we don't have to adjust.
- *
- * But for unsigned multiplies, the high order bit wasn't a sign bit,
- * and the correction is wrong. So for unsigned multiplies where the
- * high order bit is one, we end up with xy - (y << 32). To fix it
- * we add y << 32.
- */
-#if 0
- tst %o1
- bl,a 1f ! if %o1 < 0 (high order bit = 1),
- add %o4, %o0, %o4 ! %o4 += %o0 (add y to upper half)
-1: rd %y, %o0 ! get lower half of product
- retl
- addcc %o4, %g0, %o1 ! put upper half in place and set Z for %o1==0
+#if defined(__CONFIG_SPARC_V9__) || defined(__CONFIG_SPARC_V9B__)
+# include "sparcv9/umul.S"
+#elif defined(__CONFIG_SPARC_V8__)
+# include "sparcv8/umul.S"
#else
- /* Faster code from tege@sics.se. */
- sra %o1, 31, %o2 ! make mask from sign bit
- and %o0, %o2, %o2 ! %o2 = 0 or %o0, depending on sign of %o1
- rd %y, %o0 ! get lower half of product
- retl
- addcc %o4, %o2, %o1 ! add compensation and put upper half in place
+# include "sparcv7/umul.S"
#endif
-
-.Lmul_shortway:
- /*
- * Short multiply. 12 steps, followed by a final shift step.
- * The resulting bits are off by 12 and (32-12) = 20 bit positions,
- * but there is no problem with %o0 being negative (unlike above),
- * and overflow is impossible (the answer is at most 24 bits long).
- */
- mulscc %o4, %o1, %o4 ! 1
- mulscc %o4, %o1, %o4 ! 2
- mulscc %o4, %o1, %o4 ! 3
- mulscc %o4, %o1, %o4 ! 4
- mulscc %o4, %o1, %o4 ! 5
- mulscc %o4, %o1, %o4 ! 6
- mulscc %o4, %o1, %o4 ! 7
- mulscc %o4, %o1, %o4 ! 8
- mulscc %o4, %o1, %o4 ! 9
- mulscc %o4, %o1, %o4 ! 10
- mulscc %o4, %o1, %o4 ! 11
- mulscc %o4, %o1, %o4 ! 12
- mulscc %o4, %g0, %o4 ! final shift
-
- /*
- * %o4 has 20 of the bits that should be in the result; %y has
- * the bottom 12 (as %y's top 12). That is:
- *
- * %o4 %y
- * +----------------+----------------+
- * | -12- | -20- | -12- | -20- |
- * +------(---------+------)---------+
- * -----result-----
- *
- * The 12 bits of %o4 left of the `result' area are all zero;
- * in fact, all top 20 bits of %o4 are zero.
- */
-
- rd %y, %o5
- sll %o4, 12, %o0 ! shift middle bits left 12
- srl %o5, 20, %o5 ! shift low bits right 20
- or %o5, %o0, %o0
- retl
- addcc %g0, %g0, %o1 ! %o1 = zero, and set Z
-
-.size .umul , . -.umul
diff --git a/libc/sysdeps/linux/sparc/urem.S b/libc/sysdeps/linux/sparc/urem.S
index 890532141..baf6c4335 100644
--- a/libc/sysdeps/linux/sparc/urem.S
+++ b/libc/sysdeps/linux/sparc/urem.S
@@ -1,350 +1,9 @@
- /* This file is generated from divrem.m4; DO NOT EDIT! */
-/*
- * Division and remainder, from Appendix E of the Sparc Version 8
- * Architecture Manual, with fixes from Gordon Irlam.
- */
-
-/*
- * Input: dividend and divisor in %o0 and %o1 respectively.
- *
- * m4 parameters:
- * .urem name of function to generate
- * rem rem=div => %o0 / %o1; rem=rem => %o0 % %o1
- * false false=true => signed; false=false => unsigned
- *
- * Algorithm parameters:
- * N how many bits per iteration we try to get (4)
- * WORDSIZE total number of bits (32)
- *
- * Derived constants:
- * TOPBITS number of bits in the top decade of a number
- *
- * Important variables:
- * Q the partial quotient under development (initially 0)
- * R the remainder so far, initially the dividend
- * ITER number of main division loop iterations required;
- * equal to ceil(log2(quotient) / N). Note that this
- * is the log base (2^N) of the quotient.
- * V the current comparand, initially divisor*2^(ITER*N-1)
- *
- * Cost:
- * Current estimate for non-large dividend is
- * ceil(log2(quotient) / N) * (10 + 7N/2) + C
- * A large dividend is one greater than 2^(31-TOPBITS) and takes a
- * different path, as the upper bits of the quotient must be developed
- * one bit at a time.
- */
-
-
-
-#include <sys/syscall.h>
-
-
-.global .urem;
-.align 4;
-.type .urem ,@function;
-
-.urem:
-
- ! Ready to divide. Compute size of quotient; scale comparand.
- orcc %o1, %g0, %o5
- bne 1f
- mov %o0, %o3
-
- ! Divide by zero trap. If it returns, return 0 (about as
- ! wrong as possible, but that is what SunOS does...).
- ta 0x02
- retl
- clr %o0
-
-1:
- cmp %o3, %o5 ! if %o1 exceeds %o0, done
- blu .Lgot_result ! (and algorithm fails otherwise)
- clr %o2
- sethi %hi(1 << (32 - 4 - 1)), %g1
- cmp %o3, %g1
- blu .Lnot_really_big
- clr %o4
-
- ! Here the dividend is >= 2**(31-N) or so. We must be careful here,
- ! as our usual N-at-a-shot divide step will cause overflow and havoc.
- ! The number of bits in the result here is N*ITER+SC, where SC <= N.
- ! Compute ITER in an unorthodox manner: know we need to shift V into
- ! the top decade: so do not even bother to compare to R.
- 1:
- cmp %o5, %g1
- bgeu 3f
- mov 1, %g2
- sll %o5, 4, %o5
- b 1b
- add %o4, 1, %o4
-
- ! Now compute %g2.
- 2: addcc %o5, %o5, %o5
- bcc .Lnot_too_big
- add %g2, 1, %g2
-
- ! We get here if the %o1 overflowed while shifting.
- ! This means that %o3 has the high-order bit set.
- ! Restore %o5 and subtract from %o3.
- sll %g1, 4, %g1 ! high order bit
- srl %o5, 1, %o5 ! rest of %o5
- add %o5, %g1, %o5
- b .Ldo_single_div
- sub %g2, 1, %g2
-
- .Lnot_too_big:
- 3: cmp %o5, %o3
- blu 2b
- nop
- be .Ldo_single_div
- nop
- /* NB: these are commented out in the V8-Sparc manual as well */
- /* (I do not understand this) */
- ! %o5 > %o3: went too far: back up 1 step
- ! srl %o5, 1, %o5
- ! dec %g2
- ! do single-bit divide steps
- !
- ! We have to be careful here. We know that %o3 >= %o5, so we can do the
- ! first divide step without thinking. BUT, the others are conditional,
- ! and are only done if %o3 >= 0. Because both %o3 and %o5 may have the high-
- ! order bit set in the first step, just falling into the regular
- ! division loop will mess up the first time around.
- ! So we unroll slightly...
- .Ldo_single_div:
- subcc %g2, 1, %g2
- bl .Lend_regular_divide
- nop
- sub %o3, %o5, %o3
- mov 1, %o2
- b .Lend_single_divloop
- nop
- .Lsingle_divloop:
- sll %o2, 1, %o2
- bl 1f
- srl %o5, 1, %o5
- ! %o3 >= 0
- sub %o3, %o5, %o3
- b 2f
- add %o2, 1, %o2
- 1: ! %o3 < 0
- add %o3, %o5, %o3
- sub %o2, 1, %o2
- 2:
- .Lend_single_divloop:
- subcc %g2, 1, %g2
- bge .Lsingle_divloop
- tst %o3
- b,a .Lend_regular_divide
-
-.Lnot_really_big:
-1:
- sll %o5, 4, %o5
- cmp %o5, %o3
- bleu 1b
- addcc %o4, 1, %o4
- be .Lgot_result
- sub %o4, 1, %o4
-
- tst %o3 ! set up for initial iteration
-.Ldivloop:
- sll %o2, 4, %o2
- ! depth 1, accumulated bits 0
- bl .L1.16
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- ! depth 2, accumulated bits 1
- bl .L2.17
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- ! depth 3, accumulated bits 3
- bl .L3.19
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- ! depth 4, accumulated bits 7
- bl .L4.23
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- b 9f
- add %o2, (7*2+1), %o2
-
-.L4.23:
- ! remainder is negative
- addcc %o3,%o5,%o3
- b 9f
- add %o2, (7*2-1), %o2
-
-
-.L3.19:
- ! remainder is negative
- addcc %o3,%o5,%o3
- ! depth 4, accumulated bits 5
- bl .L4.21
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- b 9f
- add %o2, (5*2+1), %o2
-
-.L4.21:
- ! remainder is negative
- addcc %o3,%o5,%o3
- b 9f
- add %o2, (5*2-1), %o2
-
-
-
-.L2.17:
- ! remainder is negative
- addcc %o3,%o5,%o3
- ! depth 3, accumulated bits 1
- bl .L3.17
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- ! depth 4, accumulated bits 3
- bl .L4.19
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- b 9f
- add %o2, (3*2+1), %o2
-
-.L4.19:
- ! remainder is negative
- addcc %o3,%o5,%o3
- b 9f
- add %o2, (3*2-1), %o2
-
-
-.L3.17:
- ! remainder is negative
- addcc %o3,%o5,%o3
- ! depth 4, accumulated bits 1
- bl .L4.17
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- b 9f
- add %o2, (1*2+1), %o2
-
-.L4.17:
- ! remainder is negative
- addcc %o3,%o5,%o3
- b 9f
- add %o2, (1*2-1), %o2
-
-
-
-
-.L1.16:
- ! remainder is negative
- addcc %o3,%o5,%o3
- ! depth 2, accumulated bits -1
- bl .L2.15
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- ! depth 3, accumulated bits -1
- bl .L3.15
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- ! depth 4, accumulated bits -1
- bl .L4.15
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- b 9f
- add %o2, (-1*2+1), %o2
-
-.L4.15:
- ! remainder is negative
- addcc %o3,%o5,%o3
- b 9f
- add %o2, (-1*2-1), %o2
-
-
-.L3.15:
- ! remainder is negative
- addcc %o3,%o5,%o3
- ! depth 4, accumulated bits -3
- bl .L4.13
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- b 9f
- add %o2, (-3*2+1), %o2
-
-.L4.13:
- ! remainder is negative
- addcc %o3,%o5,%o3
- b 9f
- add %o2, (-3*2-1), %o2
-
-
-
-.L2.15:
- ! remainder is negative
- addcc %o3,%o5,%o3
- ! depth 3, accumulated bits -3
- bl .L3.13
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- ! depth 4, accumulated bits -5
- bl .L4.11
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- b 9f
- add %o2, (-5*2+1), %o2
-
-.L4.11:
- ! remainder is negative
- addcc %o3,%o5,%o3
- b 9f
- add %o2, (-5*2-1), %o2
-
-
-.L3.13:
- ! remainder is negative
- addcc %o3,%o5,%o3
- ! depth 4, accumulated bits -7
- bl .L4.9
- srl %o5,1,%o5
- ! remainder is positive
- subcc %o3,%o5,%o3
- b 9f
- add %o2, (-7*2+1), %o2
-
-.L4.9:
- ! remainder is negative
- addcc %o3,%o5,%o3
- b 9f
- add %o2, (-7*2-1), %o2
-
-
-
-
- 9:
-.Lend_regular_divide:
- subcc %o4, 1, %o4
- bge .Ldivloop
- tst %o3
- bl,a .Lgot_result
- ! non-restoring fixup here (one instruction only!)
- add %o3, %o1, %o3
-
-
-.Lgot_result:
-
- retl
- mov %o3, %o0
-
-.size .urem , . -.urem
+#include "_math_inc.h"
+
+#if defined(__CONFIG_SPARC_V9__) || defined(__CONFIG_SPARC_V9B__)
+# include "sparcv9/urem.S"
+#elif defined(__CONFIG_SPARC_V8__)
+# include "sparcv8/urem.S"
+#else
+# include "sparcv7/urem.S"
+#endif