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/*
* Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
* Copyright (C) 2008-2009 PetaLogix
* Copyright (C) 2008 Jim Law - Iris LP All rights reserved.
*
* This file is subject to the terms and conditions of the GNU General
* Public License. See the file COPYING in the main directory of this
* archive for more details.
*
* Written by Jim Law <jlaw@irispower.com>
*
* intended to replace:
* memcpy in memcpy.c and
* memmove in memmove.c
* ... in arch/microblaze/lib
*
*
* assly_fastcopy.S
*
* Attempt at quicker memcpy and memmove for MicroBlaze
* Input : Operand1 in Reg r5 - destination address
* Operand2 in Reg r6 - source address
* Operand3 in Reg r7 - number of bytes to transfer
* Output: Result in Reg r3 - starting destinaition address
*
*
* Explanation:
* Perform (possibly unaligned) copy of a block of memory
* between mem locations with size of xfer spec'd in bytes
*/
.globl memmove
.type memmove, @function
.ent memmove
#ifdef __MICROBLAZEEL__
# define BSLLI bsrli
# define BSRLI bslli
#else
# define BSLLI bslli
# define BSRLI bsrli
#endif
memmove:
cmpu r4, r5, r6 /* n = s - d */
bgei r4, HIDDEN_JUMPTARGET(memcpy)
fast_memcpy_descending:
/* move d to return register as value of function */
addi r3, r5, 0
add r5, r5, r7 /* d = d + c */
add r6, r6, r7 /* s = s + c */
addi r4, r0, 4 /* n = 4 */
cmpu r4, r4, r7 /* n = c - n (unsigned) */
blti r4,d_xfer_end /* if n < 0, less than one word to transfer */
/* transfer first 0~3 bytes to get aligned dest address */
andi r4, r5, 3 /* n = d & 3 */
/* if zero, destination already aligned */
beqi r4,d_dalign_done
rsub r7, r4, r7 /* c = c - n adjust c */
d_xfer_first_loop:
/* if no bytes left to transfer, transfer the bulk */
beqi r4,d_dalign_done
addi r6, r6, -1 /* s-- */
addi r5, r5, -1 /* d-- */
lbui r11, r6, 0 /* h = *s */
sbi r11, r5, 0 /* *d = h */
brid d_xfer_first_loop /* loop */
addi r4, r4, -1 /* n-- (IN DELAY SLOT) */
d_dalign_done:
addi r4, r0, 32 /* n = 32 */
cmpu r4, r4, r7 /* n = c - n (unsigned) */
/* if n < 0, less than one block to transfer */
blti r4, d_block_done
d_block_xfer:
andi r4, r7, 0xffffffe0 /* n = c & ~31 */
rsub r7, r4, r7 /* c = c - n */
andi r9, r6, 3 /* t1 = s & 3 */
/* if temp != 0, unaligned transfers needed */
bnei r9, d_block_unaligned
d_block_aligned:
addi r6, r6, -32 /* s = s - 32 */
addi r5, r5, -32 /* d = d - 32 */
lwi r9, r6, 28 /* t1 = *(s + 28) */
lwi r10, r6, 24 /* t2 = *(s + 24) */
lwi r11, r6, 20 /* t3 = *(s + 20) */
lwi r12, r6, 16 /* t4 = *(s + 16) */
swi r9, r5, 28 /* *(d + 28) = t1 */
swi r10, r5, 24 /* *(d + 24) = t2 */
swi r11, r5, 20 /* *(d + 20) = t3 */
swi r12, r5, 16 /* *(d + 16) = t4 */
lwi r9, r6, 12 /* t1 = *(s + 12) */
lwi r10, r6, 8 /* t2 = *(s + 8) */
lwi r11, r6, 4 /* t3 = *(s + 4) */
lwi r12, r6, 0 /* t4 = *(s + 0) */
swi r9, r5, 12 /* *(d + 12) = t1 */
swi r10, r5, 8 /* *(d + 8) = t2 */
swi r11, r5, 4 /* *(d + 4) = t3 */
addi r4, r4, -32 /* n = n - 32 */
bneid r4, d_block_aligned /* while (n) loop */
swi r12, r5, 0 /* *(d + 0) = t4 (IN DELAY SLOT) */
bri d_block_done
d_block_unaligned:
andi r8, r6, 0xfffffffc /* as = s & ~3 */
rsub r6, r4, r6 /* s = s - n */
lwi r11, r8, 0 /* h = *(as + 0) */
addi r9, r9, -1
beqi r9,d_block_u1 /* t1 was 1 => 1 byte offset */
addi r9, r9, -1
beqi r9,d_block_u2 /* t1 was 2 => 2 byte offset */
d_block_u3:
BSRLI r11, r11, 8 /* h = h >> 8 */
d_bu3_loop:
addi r8, r8, -32 /* as = as - 32 */
addi r5, r5, -32 /* d = d - 32 */
lwi r12, r8, 28 /* v = *(as + 28) */
BSLLI r9, r12, 24 /* t1 = v << 24 */
or r9, r11, r9 /* t1 = h | t1 */
swi r9, r5, 28 /* *(d + 28) = t1 */
BSRLI r11, r12, 8 /* h = v >> 8 */
lwi r12, r8, 24 /* v = *(as + 24) */
BSLLI r9, r12, 24 /* t1 = v << 24 */
or r9, r11, r9 /* t1 = h | t1 */
swi r9, r5, 24 /* *(d + 24) = t1 */
BSRLI r11, r12, 8 /* h = v >> 8 */
lwi r12, r8, 20 /* v = *(as + 20) */
BSLLI r9, r12, 24 /* t1 = v << 24 */
or r9, r11, r9 /* t1 = h | t1 */
swi r9, r5, 20 /* *(d + 20) = t1 */
BSRLI r11, r12, 8 /* h = v >> 8 */
lwi r12, r8, 16 /* v = *(as + 16) */
BSLLI r9, r12, 24 /* t1 = v << 24 */
or r9, r11, r9 /* t1 = h | t1 */
swi r9, r5, 16 /* *(d + 16) = t1 */
BSRLI r11, r12, 8 /* h = v >> 8 */
lwi r12, r8, 12 /* v = *(as + 12) */
BSLLI r9, r12, 24 /* t1 = v << 24 */
or r9, r11, r9 /* t1 = h | t1 */
swi r9, r5, 12 /* *(d + 112) = t1 */
BSRLI r11, r12, 8 /* h = v >> 8 */
lwi r12, r8, 8 /* v = *(as + 8) */
BSLLI r9, r12, 24 /* t1 = v << 24 */
or r9, r11, r9 /* t1 = h | t1 */
swi r9, r5, 8 /* *(d + 8) = t1 */
BSRLI r11, r12, 8 /* h = v >> 8 */
lwi r12, r8, 4 /* v = *(as + 4) */
BSLLI r9, r12, 24 /* t1 = v << 24 */
or r9, r11, r9 /* t1 = h | t1 */
swi r9, r5, 4 /* *(d + 4) = t1 */
BSRLI r11, r12, 8 /* h = v >> 8 */
lwi r12, r8, 0 /* v = *(as + 0) */
BSLLI r9, r12, 24 /* t1 = v << 24 */
or r9, r11, r9 /* t1 = h | t1 */
swi r9, r5, 0 /* *(d + 0) = t1 */
addi r4, r4, -32 /* n = n - 32 */
bneid r4, d_bu3_loop /* while (n) loop */
BSRLI r11, r12, 8 /* h = v >> 8 (IN DELAY SLOT) */
bri d_block_done
d_block_u1:
BSRLI r11, r11, 24 /* h = h >> 24 */
d_bu1_loop:
addi r8, r8, -32 /* as = as - 32 */
addi r5, r5, -32 /* d = d - 32 */
lwi r12, r8, 28 /* v = *(as + 28) */
BSLLI r9, r12, 8 /* t1 = v << 8 */
or r9, r11, r9 /* t1 = h | t1 */
swi r9, r5, 28 /* *(d + 28) = t1 */
BSRLI r11, r12, 24 /* h = v >> 24 */
lwi r12, r8, 24 /* v = *(as + 24) */
BSLLI r9, r12, 8 /* t1 = v << 8 */
or r9, r11, r9 /* t1 = h | t1 */
swi r9, r5, 24 /* *(d + 24) = t1 */
BSRLI r11, r12, 24 /* h = v >> 24 */
lwi r12, r8, 20 /* v = *(as + 20) */
BSLLI r9, r12, 8 /* t1 = v << 8 */
or r9, r11, r9 /* t1 = h | t1 */
swi r9, r5, 20 /* *(d + 20) = t1 */
BSRLI r11, r12, 24 /* h = v >> 24 */
lwi r12, r8, 16 /* v = *(as + 16) */
BSLLI r9, r12, 8 /* t1 = v << 8 */
or r9, r11, r9 /* t1 = h | t1 */
swi r9, r5, 16 /* *(d + 16) = t1 */
BSRLI r11, r12, 24 /* h = v >> 24 */
lwi r12, r8, 12 /* v = *(as + 12) */
BSLLI r9, r12, 8 /* t1 = v << 8 */
or r9, r11, r9 /* t1 = h | t1 */
swi r9, r5, 12 /* *(d + 112) = t1 */
BSRLI r11, r12, 24 /* h = v >> 24 */
lwi r12, r8, 8 /* v = *(as + 8) */
BSLLI r9, r12, 8 /* t1 = v << 8 */
or r9, r11, r9 /* t1 = h | t1 */
swi r9, r5, 8 /* *(d + 8) = t1 */
BSRLI r11, r12, 24 /* h = v >> 24 */
lwi r12, r8, 4 /* v = *(as + 4) */
BSLLI r9, r12, 8 /* t1 = v << 8 */
or r9, r11, r9 /* t1 = h | t1 */
swi r9, r5, 4 /* *(d + 4) = t1 */
BSRLI r11, r12, 24 /* h = v >> 24 */
lwi r12, r8, 0 /* v = *(as + 0) */
BSLLI r9, r12, 8 /* t1 = v << 8 */
or r9, r11, r9 /* t1 = h | t1 */
swi r9, r5, 0 /* *(d + 0) = t1 */
addi r4, r4, -32 /* n = n - 32 */
bneid r4, d_bu1_loop /* while (n) loop */
BSRLI r11, r12, 24 /* h = v >> 24 (IN DELAY SLOT) */
bri d_block_done
d_block_u2:
BSRLI r11, r11, 16 /* h = h >> 16 */
d_bu2_loop:
addi r8, r8, -32 /* as = as - 32 */
addi r5, r5, -32 /* d = d - 32 */
lwi r12, r8, 28 /* v = *(as + 28) */
BSLLI r9, r12, 16 /* t1 = v << 16 */
or r9, r11, r9 /* t1 = h | t1 */
swi r9, r5, 28 /* *(d + 28) = t1 */
BSRLI r11, r12, 16 /* h = v >> 16 */
lwi r12, r8, 24 /* v = *(as + 24) */
BSLLI r9, r12, 16 /* t1 = v << 16 */
or r9, r11, r9 /* t1 = h | t1 */
swi r9, r5, 24 /* *(d + 24) = t1 */
BSRLI r11, r12, 16 /* h = v >> 16 */
lwi r12, r8, 20 /* v = *(as + 20) */
BSLLI r9, r12, 16 /* t1 = v << 16 */
or r9, r11, r9 /* t1 = h | t1 */
swi r9, r5, 20 /* *(d + 20) = t1 */
BSRLI r11, r12, 16 /* h = v >> 16 */
lwi r12, r8, 16 /* v = *(as + 16) */
BSLLI r9, r12, 16 /* t1 = v << 16 */
or r9, r11, r9 /* t1 = h | t1 */
swi r9, r5, 16 /* *(d + 16) = t1 */
BSRLI r11, r12, 16 /* h = v >> 16 */
lwi r12, r8, 12 /* v = *(as + 12) */
BSLLI r9, r12, 16 /* t1 = v << 16 */
or r9, r11, r9 /* t1 = h | t1 */
swi r9, r5, 12 /* *(d + 112) = t1 */
BSRLI r11, r12, 16 /* h = v >> 16 */
lwi r12, r8, 8 /* v = *(as + 8) */
BSLLI r9, r12, 16 /* t1 = v << 16 */
or r9, r11, r9 /* t1 = h | t1 */
swi r9, r5, 8 /* *(d + 8) = t1 */
BSRLI r11, r12, 16 /* h = v >> 16 */
lwi r12, r8, 4 /* v = *(as + 4) */
BSLLI r9, r12, 16 /* t1 = v << 16 */
or r9, r11, r9 /* t1 = h | t1 */
swi r9, r5, 4 /* *(d + 4) = t1 */
BSRLI r11, r12, 16 /* h = v >> 16 */
lwi r12, r8, 0 /* v = *(as + 0) */
BSLLI r9, r12, 16 /* t1 = v << 16 */
or r9, r11, r9 /* t1 = h | t1 */
swi r9, r5, 0 /* *(d + 0) = t1 */
addi r4, r4, -32 /* n = n - 32 */
bneid r4, d_bu2_loop /* while (n) loop */
BSRLI r11, r12, 16 /* h = v >> 16 (IN DELAY SLOT) */
d_block_done:
addi r4, r0, 4 /* n = 4 */
cmpu r4, r4, r7 /* n = c - n (unsigned) */
blti r4,d_xfer_end /* if n < 0, less than one word to transfer */
d_word_xfer:
andi r4, r7, 0xfffffffc /* n = c & ~3 */
rsub r5, r4, r5 /* d = d - n */
rsub r6, r4, r6 /* s = s - n */
rsub r7, r4, r7 /* c = c - n */
andi r9, r6, 3 /* t1 = s & 3 */
/* if temp != 0, unaligned transfers needed */
bnei r9, d_word_unaligned
d_word_aligned:
addi r4, r4,-4 /* n-- */
lw r9, r6, r4 /* t1 = *(s+n) */
bneid r4, d_word_aligned /* loop */
sw r9, r5, r4 /* *(d+n) = t1 (IN DELAY SLOT) */
bri d_word_done
d_word_unaligned:
andi r8, r6, 0xfffffffc /* as = s & ~3 */
lw r11, r8, r4 /* h = *(as + n) */
addi r9, r9, -1
beqi r9,d_word_u1 /* t1 was 1 => 1 byte offset */
addi r9, r9, -1
beqi r9,d_word_u2 /* t1 was 2 => 2 byte offset */
d_word_u3:
BSRLI r11, r11, 8 /* h = h >> 8 */
d_wu3_loop:
addi r4, r4,-4 /* n = n - 4 */
lw r12, r8, r4 /* v = *(as + n) */
BSLLI r9, r12, 24 /* t1 = v << 24 */
or r9, r11, r9 /* t1 = h | t1 */
sw r9, r5, r4 /* *(d + n) = t1 */
bneid r4, d_wu3_loop /* while (n) loop */
BSRLI r11, r12, 8 /* h = v >> 8 (IN DELAY SLOT) */
bri d_word_done
d_word_u1:
BSRLI r11, r11, 24 /* h = h >> 24 */
d_wu1_loop:
addi r4, r4,-4 /* n = n - 4 */
lw r12, r8, r4 /* v = *(as + n) */
BSLLI r9, r12, 8 /* t1 = v << 8 */
or r9, r11, r9 /* t1 = h | t1 */
sw r9, r5, r4 /* *(d + n) = t1 */
bneid r4, d_wu1_loop /* while (n) loop */
BSRLI r11, r12, 24 /* h = v >> 24 (IN DELAY SLOT) */
bri d_word_done
d_word_u2:
BSRLI r11, r11, 16 /* h = h >> 16 */
d_wu2_loop:
addi r4, r4,-4 /* n = n - 4 */
lw r12, r8, r4 /* v = *(as + n) */
BSLLI r9, r12, 16 /* t1 = v << 16 */
or r9, r11, r9 /* t1 = h | t1 */
sw r9, r5, r4 /* *(d + n) = t1 */
bneid r4, d_wu2_loop /* while (n) loop */
BSRLI r11, r12, 16 /* h = v >> 16 (IN DELAY SLOT) */
d_word_done:
d_xfer_end:
d_xfer_end_loop:
beqi r7, a_done /* while (c) */
addi r6, r6, -1 /* s-- */
lbui r9, r6, 0 /* t1 = *s */
addi r5, r5, -1 /* d-- */
sbi r9, r5, 0 /* *d = t1 */
brid d_xfer_end_loop /* loop */
addi r7, r7, -1 /* c-- (IN DELAY SLOT) */
a_done:
d_done:
rtsd r15, 8
nop
.size memmove, . - memmove
.end memmove
libc_hidden_def(memmove)
|
