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Diffstat (limited to 'libc/string/sparc/sparc64/memchr.S')
-rw-r--r--libc/string/sparc/sparc64/memchr.S261
1 files changed, 261 insertions, 0 deletions
diff --git a/libc/string/sparc/sparc64/memchr.S b/libc/string/sparc/sparc64/memchr.S
new file mode 100644
index 000000000..a10dfbc63
--- /dev/null
+++ b/libc/string/sparc/sparc64/memchr.S
@@ -0,0 +1,261 @@
+/* memchr (str, ch, n) -- Return pointer to first occurrence of CH in STR less
+ than N.
+ For SPARC v9.
+ Copyright (C) 1998, 1999, 2000, 2003 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Jan Vondrak <jvon4518@ss1000.ms.mff.cuni.cz> and
+ Jakub Jelinek <jj@ultra.linux.cz>.
+ This version is developed using the same algorithm as the fast C
+ version which carries the following introduction:
+ Based on strlen implementation by Torbjorn Granlund (tege@sics.se),
+ with help from Dan Sahlin (dan@sics.se) and
+ commentary by Jim Blandy (jimb@ai.mit.edu);
+ adaptation to memchr suggested by Dick Karpinski (dick@cca.ucsf.edu),
+ and implemented by Roland McGrath (roland@ai.mit.edu).
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include <asm/asi.h>
+#ifndef XCC
+#define XCC xcc
+#define USE_BPR
+ .register %g2, #scratch
+ .register %g3, #scratch
+#endif
+
+ /* Normally, this uses
+ ((xword - 0x0101010101010101) & 0x8080808080808080) test
+ to find out if any byte in xword could be zero. This is fast, but
+ also gives false alarm for any byte in range 0x81-0xff. It does
+ not matter for correctness, as if this test tells us there could
+ be some zero byte, we check it byte by byte, but if bytes with
+ high bits set are common in the strings, then this will give poor
+ performance. You can #define EIGHTBIT_NOT_RARE and the algorithm
+ will use one tick slower, but more precise test
+ ((xword - 0x0101010101010101) & (~xword) & 0x8080808080808080),
+ which does not give any false alarms (but if some bits are set,
+ one cannot assume from it which bytes are zero and which are not).
+ It is yet to be measured, what is the correct default for glibc
+ in these days for an average user.
+ */
+
+ .text
+ .align 32
+ENTRY(__memchr)
+ and %o1, 0xff, %o1 /* IEU0 Group */
+#ifdef USE_BPR
+ brz,pn %o2, 12f /* CTI+IEU1 */
+#else
+ tst %o2 /* IEU1 */
+ be,pn %XCC, 12f /* CTI */
+#endif
+ sll %o1, 8, %g3 /* IEU0 Group */
+ add %o0, %o2, %o2 /* IEU1 */
+
+ sethi %hi(0x01010101), %g1 /* IEU0 Group */
+ or %g3, %o1, %g3 /* IEU1 */
+ ldub [%o0], %o3 /* Load */
+ sllx %g3, 16, %g5 /* IEU0 Group */
+
+ or %g1, %lo(0x01010101), %g1 /* IEU1 */
+ sllx %g1, 32, %g2 /* IEU0 Group */
+ or %g3, %g5, %g3 /* IEU1 */
+ sllx %g3, 32, %g5 /* IEU0 Group */
+
+ cmp %o3, %o1 /* IEU1 */
+ be,pn %xcc, 13f /* CTI */
+ or %g1, %g2, %g1 /* IEU0 Group */
+ andcc %o0, 7, %g0 /* IEU1 */
+
+ bne,a,pn %icc, 21f /* CTI */
+ add %o0, 1, %o0 /* IEU0 Group */
+ ldx [%o0], %o3 /* Load Group */
+ sllx %g1, 7, %g2 /* IEU0 */
+
+ or %g3, %g5, %g3 /* IEU1 */
+1: add %o0, 8, %o0 /* IEU0 Group */
+ xor %o3, %g3, %o4 /* IEU1 */
+ /* %g1 = 0101010101010101 *
+ * %g2 = 8080088080808080 *
+ * %g3 = c c c c c c c c *
+ * %o3 = value *
+ * %o4 = value XOR c */
+2: cmp %o0, %o2 /* IEU1 Group */
+
+ bg,pn %XCC, 11f /* CTI */
+ ldxa [%o0] ASI_PNF, %o3 /* Load */
+ sub %o4, %g1, %o5 /* IEU0 Group */
+ add %o0, 8, %o0 /* IEU1 */
+#ifdef EIGHTBIT_NOT_RARE
+ andn %o5, %o4, %o5 /* IEU0 Group */
+#endif
+
+ andcc %o5, %g2, %g0 /* IEU1 Group */
+ be,a,pt %xcc, 2b /* CTI */
+ xor %o3, %g3, %o4 /* IEU0 */
+ srlx %o4, 56, %g5 /* IEU0 */
+
+ andcc %g5, 0xff, %g0 /* IEU1 Group */
+ be,pn %icc, 3f /* CTI */
+ srlx %o4, 48, %g5 /* IEU0 */
+ andcc %g5, 0xff, %g0 /* IEU1 Group */
+
+ be,pn %icc, 4f /* CTI */
+ srlx %o4, 40, %g5 /* IEU0 */
+ andcc %g5, 0xff, %g0 /* IEU1 Group */
+ be,pn %icc, 5f /* CTI */
+
+ srlx %o4, 32, %g5 /* IEU0 */
+ andcc %g5, 0xff, %g0 /* IEU1 Group */
+ be,pn %icc, 6f /* CTI */
+ srlx %o4, 24, %g5 /* IEU0 */
+
+ andcc %g5, 0xff, %g0 /* IEU1 Group */
+ be,pn %icc, 7f /* CTI */
+ srlx %o4, 16, %g5 /* IEU0 */
+ andcc %g5, 0xff, %g0 /* IEU1 Group */
+
+ be,pn %icc, 8f /* CTI */
+ srlx %o4, 8, %g5 /* IEU0 */
+ andcc %g5, 0xff, %g0 /* IEU1 Group */
+ be,pn %icc, 9f /* CTI */
+
+ andcc %o4, 0xff, %g0 /* IEU1 Group */
+ bne,pt %icc, 2b /* CTI */
+ xor %o3, %g3, %o4 /* IEU0 */
+ retl /* CTI+IEU1 Group */
+
+ add %o0, -9, %o0 /* IEU0 */
+
+ .align 16
+3: retl /* CTI+IEU1 Group */
+ add %o0, -16, %o0 /* IEU0 */
+4: retl /* CTI+IEU1 Group */
+ add %o0, -15, %o0 /* IEU0 */
+
+5: retl /* CTI+IEU1 Group */
+ add %o0, -14, %o0 /* IEU0 */
+6: retl /* CTI+IEU1 Group */
+ add %o0, -13, %o0 /* IEU0 */
+
+7: retl /* CTI+IEU1 Group */
+ add %o0, -12, %o0 /* IEU0 */
+8: retl /* CTI+IEU1 Group */
+ add %o0, -11, %o0 /* IEU0 */
+
+9: retl /* CTI+IEU1 Group */
+ add %o0, -10, %o0 /* IEU0 */
+11: sub %o4, %g1, %o5 /* IEU0 Group */
+ sub %o0, 8, %o0 /* IEU1 */
+
+ andcc %o5, %g2, %g0 /* IEU1 Group */
+ be,pt %xcc, 12f /* CTI */
+ sub %o2, %o0, %o2 /* IEU0 */
+ tst %o2 /* IEU1 Group */
+
+ be,pn %XCC, 12f /* CTI */
+ srlx %o4, 56, %g5 /* IEU0 */
+ andcc %g5, 0xff, %g0 /* IEU1 Group */
+ be,pn %icc, 13f /* CTI */
+
+ cmp %o2, 1 /* IEU0 */
+ be,pn %XCC, 12f /* CTI Group */
+ srlx %o4, 48, %g5 /* IEU0 */
+ andcc %g5, 0xff, %g0 /* IEU1 Group */
+
+ be,pn %icc, 14f /* CTI */
+ cmp %o2, 2 /* IEU1 Group */
+ be,pn %XCC, 12f /* CTI */
+ srlx %o4, 40, %g5 /* IEU0 */
+
+ andcc %g5, 0xff, %g0 /* IEU1 Group */
+ be,pn %icc, 15f /* CTI */
+ cmp %o2, 3 /* IEU1 Group */
+ be,pn %XCC, 12f /* CTI */
+
+ srlx %o4, 32, %g5 /* IEU0 */
+ andcc %g5, 0xff, %g0 /* IEU1 Group */
+ be,pn %icc, 16f /* CTI */
+ cmp %o2, 4 /* IEU1 Group */
+
+ be,pn %XCC, 12f /* CTI */
+ srlx %o4, 24, %g5 /* IEU0 */
+ andcc %g5, 0xff, %g0 /* IEU1 Group */
+ be,pn %icc, 17f /* CTI */
+
+ cmp %o2, 5 /* IEU1 Group */
+ be,pn %XCC, 12f /* CTI */
+ srlx %o4, 16, %g5 /* IEU0 */
+ andcc %g5, 0xff, %g0 /* IEU1 Group */
+
+ be,pn %icc, 18f /* CTI */
+ cmp %o2, 6 /* IEU1 Group */
+ be,pn %XCC, 12f /* CTI */
+ srlx %o4, 8, %g5 /* IEU0 */
+
+ andcc %g5, 0xff, %g0 /* IEU1 Group */
+ be,pn %icc, 19f /* CTI */
+ nop /* IEU0 */
+12: retl /* CTI+IEU1 Group */
+
+ clr %o0 /* IEU0 */
+ nop /* Stub */
+13: retl /* CTI+IEU1 Group */
+ nop /* IEU0 */
+
+14: retl /* CTI+IEU1 Group */
+ add %o0, 1, %o0 /* IEU0 */
+15: retl /* CTI+IEU1 Group */
+ add %o0, 2, %o0 /* IEU0 */
+
+16: retl /* CTI+IEU1 Group */
+ add %o0, 3, %o0 /* IEU0 */
+17: retl /* CTI+IEU1 Group */
+ add %o0, 4, %o0 /* IEU0 */
+
+18: retl /* CTI+IEU1 Group */
+ add %o0, 5, %o0 /* IEU0 */
+19: retl /* CTI+IEU1 Group */
+ add %o0, 6, %o0 /* IEU0 */
+
+21: cmp %o0, %o2 /* IEU1 */
+ be,pn %XCC, 12b /* CTI */
+ sllx %g1, 7, %g2 /* IEU0 Group */
+ ldub [%o0], %o3 /* Load */
+
+ or %g3, %g5, %g3 /* IEU1 */
+22: andcc %o0, 7, %g0 /* IEU1 Group */
+ be,a,pn %icc, 1b /* CTI */
+ ldx [%o0], %o3 /* Load */
+
+ cmp %o3, %o1 /* IEU1 Group */
+ be,pn %xcc, 23f /* CTI */
+ add %o0, 1, %o0 /* IEU0 */
+ cmp %o0, %o2 /* IEU1 Group */
+
+ bne,a,pt %XCC, 22b /* CTI */
+ ldub [%o0], %o3 /* Load */
+ retl /* CTI+IEU1 Group */
+ clr %o0 /* IEU0 */
+
+23: retl /* CTI+IEU1 Group */
+ add %o0, -1, %o0 /* IEU0 */
+END(__memchr)
+
+weak_alias (__memchr, memchr)
+#if !__BOUNDED_POINTERS__
+weak_alias (__memchr, __ubp_memchr)
+#endif
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-24 05:35:20 +0000