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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
*/
.text
.globl memcpy
.type memcpy, @function
.ent memcpy
memcpy:
fast_memcpy_ascending:
/* move d to return register as value of function */
addi r3, r5, 0
addi r4, r0, 4 /* n = 4 */
cmpu r4, r4, r7 /* n = c - n (unsigned) */
blti r4, a_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, a_dalign_done
/* n = 4 - n (yields 3, 2, 1 transfers for 1, 2, 3 addr offset) */
rsubi r4, r4, 4
rsub r7, r4, r7 /* c = c - n adjust c */
a_xfer_first_loop:
/* if no bytes left to transfer, transfer the bulk */
beqi r4, a_dalign_done
lbui r11, r6, 0 /* h = *s */
sbi r11, r5, 0 /* *d = h */
addi r6, r6, 1 /* s++ */
addi r5, r5, 1 /* d++ */
brid a_xfer_first_loop /* loop */
addi r4, r4, -1 /* n-- (IN DELAY SLOT) */
a_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, a_block_done
a_block_xfer:
andi r9, r6, 3 /* t1 = s & 3 */
/* if temp == 0, everything is word-aligned */
beqi r9, a_word_xfer
a_block_unaligned:
andi r4, r7, 0xffffffe0 /* n = c & ~31 */
rsub r7, r4, r7 /* c = c - n */
andi r8, r6, 0xfffffffc /* as = s & ~3 */
add r6, r6, r4 /* s = s + n */
lwi r11, r8, 0 /* h = *(as + 0) */
addi r9, r9, -1
beqi r9, a_block_u1 /* t1 was 1 => 1 byte offset */
addi r9, r9, -1
beqi r9, a_block_u2 /* t1 was 2 => 2 byte offset */
a_block_u3:
bslli r11, r11, 24 /* h = h << 24 */
a_bu3_loop:
lwi r12, r8, 4 /* v = *(as + 4) */
bsrli r9, r12, 8 /* t1 = v >> 8 */
or r9, r11, r9 /* t1 = h | t1 */
swi r9, r5, 0 /* *(d + 0) = t1 */
bslli r11, r12, 24 /* h = v << 24 */
lwi r12, r8, 8 /* v = *(as + 8) */
bsrli r9, r12, 8 /* t1 = v >> 8 */
or r9, r11, r9 /* t1 = h | t1 */
swi r9, r5, 4 /* *(d + 4) = t1 */
bslli r11, r12, 24 /* h = v << 24 */
lwi r12, r8, 12 /* v = *(as + 12) */
bsrli r9, r12, 8 /* t1 = v >> 8 */
or r9, r11, r9 /* t1 = h | t1 */
swi r9, r5, 8 /* *(d + 8) = t1 */
bslli r11, r12, 24 /* h = v << 24 */
lwi r12, r8, 16 /* v = *(as + 16) */
bsrli r9, r12, 8 /* t1 = v >> 8 */
or r9, r11, r9 /* t1 = h | t1 */
swi r9, r5, 12 /* *(d + 12) = t1 */
bslli r11, r12, 24 /* h = v << 24 */
lwi r12, r8, 20 /* v = *(as + 20) */
bsrli r9, r12, 8 /* t1 = v >> 8 */
or r9, r11, r9 /* t1 = h | t1 */
swi r9, r5, 16 /* *(d + 16) = t1 */
bslli r11, r12, 24 /* h = v << 24 */
lwi r12, r8, 24 /* v = *(as + 24) */
bsrli r9, r12, 8 /* t1 = v >> 8 */
or r9, r11, r9 /* t1 = h | t1 */
swi r9, r5, 20 /* *(d + 20) = t1 */
bslli r11, r12, 24 /* h = v << 24 */
lwi r12, r8, 28 /* v = *(as + 28) */
bsrli r9, r12, 8 /* t1 = v >> 8 */
or r9, r11, r9 /* t1 = h | t1 */
swi r9, r5, 24 /* *(d + 24) = t1 */
bslli r11, r12, 24 /* h = v << 24 */
lwi r12, r8, 32 /* v = *(as + 32) */
bsrli r9, r12, 8 /* t1 = v >> 8 */
or r9, r11, r9 /* t1 = h | t1 */
swi r9, r5, 28 /* *(d + 28) = t1 */
bslli r11, r12, 24 /* h = v << 24 */
addi r8, r8, 32 /* as = as + 32 */
addi r4, r4, -32 /* n = n - 32 */
bneid r4, a_bu3_loop /* while (n) loop */
addi r5, r5, 32 /* d = d + 32 (IN DELAY SLOT) */
bri a_block_done
a_block_u1:
bslli r11, r11, 8 /* h = h << 8 */
a_bu1_loop:
lwi r12, r8, 4 /* v = *(as + 4) */
bsrli r9, r12, 24 /* t1 = v >> 24 */
or r9, r11, r9 /* t1 = h | t1 */
swi r9, r5, 0 /* *(d + 0) = t1 */
bslli r11, r12, 8 /* h = v << 8 */
lwi r12, r8, 8 /* v = *(as + 8) */
bsrli r9, r12, 24 /* t1 = v >> 24 */
or r9, r11, r9 /* t1 = h | t1 */
swi r9, r5, 4 /* *(d + 4) = t1 */
bslli r11, r12, 8 /* h = v << 8 */
lwi r12, r8, 12 /* v = *(as + 12) */
bsrli r9, r12, 24 /* t1 = v >> 24 */
or r9, r11, r9 /* t1 = h | t1 */
swi r9, r5, 8 /* *(d + 8) = t1 */
bslli r11, r12, 8 /* h = v << 8 */
lwi r12, r8, 16 /* v = *(as + 16) */
bsrli r9, r12, 24 /* t1 = v >> 24 */
or r9, r11, r9 /* t1 = h | t1 */
swi r9, r5, 12 /* *(d + 12) = t1 */
bslli r11, r12, 8 /* h = v << 8 */
lwi r12, r8, 20 /* v = *(as + 20) */
bsrli r9, r12, 24 /* t1 = v >> 24 */
or r9, r11, r9 /* t1 = h | t1 */
swi r9, r5, 16 /* *(d + 16) = t1 */
bslli r11, r12, 8 /* h = v << 8 */
lwi r12, r8, 24 /* v = *(as + 24) */
bsrli r9, r12, 24 /* t1 = v >> 24 */
or r9, r11, r9 /* t1 = h | t1 */
swi r9, r5, 20 /* *(d + 20) = t1 */
bslli r11, r12, 8 /* h = v << 8 */
lwi r12, r8, 28 /* v = *(as + 28) */
bsrli r9, r12, 24 /* t1 = v >> 24 */
or r9, r11, r9 /* t1 = h | t1 */
swi r9, r5, 24 /* *(d + 24) = t1 */
bslli r11, r12, 8 /* h = v << 8 */
lwi r12, r8, 32 /* v = *(as + 32) */
bsrli r9, r12, 24 /* t1 = v >> 24 */
or r9, r11, r9 /* t1 = h | t1 */
swi r9, r5, 28 /* *(d + 28) = t1 */
bslli r11, r12, 8 /* h = v << 8 */
addi r8, r8, 32 /* as = as + 32 */
addi r4, r4, -32 /* n = n - 32 */
bneid r4, a_bu1_loop /* while (n) loop */
addi r5, r5, 32 /* d = d + 32 (IN DELAY SLOT) */
bri a_block_done
a_block_u2:
bslli r11, r11, 16 /* h = h << 16 */
a_bu2_loop:
lwi r12, r8, 4 /* v = *(as + 4) */
bsrli r9, r12, 16 /* t1 = v >> 16 */
or r9, r11, r9 /* t1 = h | t1 */
swi r9, r5, 0 /* *(d + 0) = t1 */
bslli r11, r12, 16 /* h = v << 16 */
lwi r12, r8, 8 /* v = *(as + 8) */
bsrli r9, r12, 16 /* t1 = v >> 16 */
or r9, r11, r9 /* t1 = h | t1 */
swi r9, r5, 4 /* *(d + 4) = t1 */
bslli r11, r12, 16 /* h = v << 16 */
lwi r12, r8, 12 /* v = *(as + 12) */
bsrli r9, r12, 16 /* t1 = v >> 16 */
or r9, r11, r9 /* t1 = h | t1 */
swi r9, r5, 8 /* *(d + 8) = t1 */
bslli r11, r12, 16 /* h = v << 16 */
lwi r12, r8, 16 /* v = *(as + 16) */
bsrli r9, r12, 16 /* t1 = v >> 16 */
or r9, r11, r9 /* t1 = h | t1 */
swi r9, r5, 12 /* *(d + 12) = t1 */
bslli r11, r12, 16 /* h = v << 16 */
lwi r12, r8, 20 /* v = *(as + 20) */
bsrli r9, r12, 16 /* t1 = v >> 16 */
or r9, r11, r9 /* t1 = h | t1 */
swi r9, r5, 16 /* *(d + 16) = t1 */
bslli r11, r12, 16 /* h = v << 16 */
lwi r12, r8, 24 /* v = *(as + 24) */
bsrli r9, r12, 16 /* t1 = v >> 16 */
or r9, r11, r9 /* t1 = h | t1 */
swi r9, r5, 20 /* *(d + 20) = t1 */
bslli r11, r12, 16 /* h = v << 16 */
lwi r12, r8, 28 /* v = *(as + 28) */
bsrli r9, r12, 16 /* t1 = v >> 16 */
or r9, r11, r9 /* t1 = h | t1 */
swi r9, r5, 24 /* *(d + 24) = t1 */
bslli r11, r12, 16 /* h = v << 16 */
lwi r12, r8, 32 /* v = *(as + 32) */
bsrli r9, r12, 16 /* t1 = v >> 16 */
or r9, r11, r9 /* t1 = h | t1 */
swi r9, r5, 28 /* *(d + 28) = t1 */
bslli r11, r12, 16 /* h = v << 16 */
addi r8, r8, 32 /* as = as + 32 */
addi r4, r4, -32 /* n = n - 32 */
bneid r4, a_bu2_loop /* while (n) loop */
addi r5, r5, 32 /* d = d + 32 (IN DELAY SLOT) */
a_block_done:
addi r4, r0, 4 /* n = 4 */
cmpu r4, r4, r7 /* n = c - n (unsigned) */
blti r4, a_xfer_end /* if n < 0, less than one word to transfer */
a_word_xfer:
andi r4, r7, 0xfffffffc /* n = c & ~3 */
addi r10, r0, 0 /* offset = 0 */
andi r9, r6, 3 /* t1 = s & 3 */
/* if temp != 0, unaligned transfers needed */
bnei r9, a_word_unaligned
a_word_aligned:
lw r9, r6, r10 /* t1 = *(s+offset) */
sw r9, r5, r10 /* *(d+offset) = t1 */
addi r4, r4,-4 /* n-- */
bneid r4, a_word_aligned /* loop */
addi r10, r10, 4 /* offset++ (IN DELAY SLOT) */
bri a_word_done
a_word_unaligned:
andi r8, r6, 0xfffffffc /* as = s & ~3 */
lwi r11, r8, 0 /* h = *(as + 0) */
addi r8, r8, 4 /* as = as + 4 */
addi r9, r9, -1
beqi r9, a_word_u1 /* t1 was 1 => 1 byte offset */
addi r9, r9, -1
beqi r9, a_word_u2 /* t1 was 2 => 2 byte offset */
a_word_u3:
bslli r11, r11, 24 /* h = h << 24 */
a_wu3_loop:
lw r12, r8, r10 /* v = *(as + offset) */
bsrli r9, r12, 8 /* t1 = v >> 8 */
or r9, r11, r9 /* t1 = h | t1 */
sw r9, r5, r10 /* *(d + offset) = t1 */
bslli r11, r12, 24 /* h = v << 24 */
addi r4, r4,-4 /* n = n - 4 */
bneid r4, a_wu3_loop /* while (n) loop */
addi r10, r10, 4 /* offset = ofset + 4 (IN DELAY SLOT) */
bri a_word_done
a_word_u1:
bslli r11, r11, 8 /* h = h << 8 */
a_wu1_loop:
lw r12, r8, r10 /* v = *(as + offset) */
bsrli r9, r12, 24 /* t1 = v >> 24 */
or r9, r11, r9 /* t1 = h | t1 */
sw r9, r5, r10 /* *(d + offset) = t1 */
bslli r11, r12, 8 /* h = v << 8 */
addi r4, r4,-4 /* n = n - 4 */
bneid r4, a_wu1_loop /* while (n) loop */
addi r10, r10, 4 /* offset = ofset + 4 (IN DELAY SLOT) */
bri a_word_done
a_word_u2:
bslli r11, r11, 16 /* h = h << 16 */
a_wu2_loop:
lw r12, r8, r10 /* v = *(as + offset) */
bsrli r9, r12, 16 /* t1 = v >> 16 */
or r9, r11, r9 /* t1 = h | t1 */
sw r9, r5, r10 /* *(d + offset) = t1 */
bslli r11, r12, 16 /* h = v << 16 */
addi r4, r4,-4 /* n = n - 4 */
bneid r4, a_wu2_loop /* while (n) loop */
addi r10, r10, 4 /* offset = ofset + 4 (IN DELAY SLOT) */
a_word_done:
add r5, r5, r10 /* d = d + offset */
add r6, r6, r10 /* s = s + offset */
rsub r7, r10, r7 /* c = c - offset */
a_xfer_end:
a_xfer_end_loop:
beqi r7, a_done /* while (c) */
lbui r9, r6, 0 /* t1 = *s */
addi r6, r6, 1 /* s++ */
sbi r9, r5, 0 /* *d = t1 */
addi r7, r7, -1 /* c-- */
brid a_xfer_end_loop /* loop */
addi r5, r5, 1 /* d++ (IN DELAY SLOT) */
a_done:
rtsd r15, 8
nop
.size memcpy, . - memcpy
.end memcpy
libc_hidden_def(memcpy)
|
