mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-11 22:00:08 +00:00
527 lines
10 KiB
ArmAsm
527 lines
10 KiB
ArmAsm
/* Optimized memcpy implementation for PowerPC32/POWER7.
|
|
Copyright (C) 2010, 2011 Free Software Foundation, Inc.
|
|
Contributed by Luis Machado <luisgpm@br.ibm.com>.
|
|
This file is part of the GNU C Library.
|
|
|
|
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, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <sysdep.h>
|
|
#include <bp-sym.h>
|
|
#include <bp-asm.h>
|
|
|
|
/* __ptr_t [r3] memcpy (__ptr_t dst [r3], __ptr_t src [r4], size_t len [r5]);
|
|
Returns 'dst'. */
|
|
|
|
.machine power7
|
|
EALIGN (BP_SYM (memcpy), 5, 0)
|
|
CALL_MCOUNT
|
|
|
|
stwu 1,-32(1)
|
|
cfi_adjust_cfa_offset(32)
|
|
stw 30,20(1)
|
|
cfi_offset(30,(20-32))
|
|
stw 31,24(1)
|
|
mr 30,3
|
|
cmplwi cr1,5,31
|
|
neg 0,3
|
|
cfi_offset(31,-8)
|
|
ble cr1, L(copy_LT_32) /* If move < 32 bytes use short move
|
|
code. */
|
|
|
|
andi. 11,3,7 /* Check alignment of DST. */
|
|
clrlwi 10,4,29 /* Check alignment of SRC. */
|
|
cmplw cr6,10,11 /* SRC and DST alignments match? */
|
|
mr 12,4
|
|
mr 31,5
|
|
bne cr6,L(copy_GE_32_unaligned)
|
|
|
|
srwi 9,5,3 /* Number of full quadwords remaining. */
|
|
|
|
beq L(copy_GE_32_aligned_cont)
|
|
|
|
clrlwi 0,0,29
|
|
mtcrf 0x01,0
|
|
subf 31,0,5
|
|
|
|
/* Get the SRC aligned to 8 bytes. */
|
|
|
|
1: bf 31,2f
|
|
lbz 6,0(12)
|
|
addi 12,12,1
|
|
stb 6,0(3)
|
|
addi 3,3,1
|
|
2: bf 30,4f
|
|
lhz 6,0(12)
|
|
addi 12,12,2
|
|
sth 6,0(3)
|
|
addi 3,3,2
|
|
4: bf 29,0f
|
|
lwz 6,0(12)
|
|
addi 12,12,4
|
|
stw 6,0(3)
|
|
addi 3,3,4
|
|
0:
|
|
clrlwi 10,12,29 /* Check alignment of SRC again. */
|
|
srwi 9,31,3 /* Number of full doublewords remaining. */
|
|
|
|
L(copy_GE_32_aligned_cont):
|
|
|
|
clrlwi 11,31,29
|
|
mtcrf 0x01,9
|
|
|
|
srwi 8,31,5
|
|
cmplwi cr1,9,4
|
|
cmplwi cr6,11,0
|
|
mr 11,12
|
|
|
|
/* Copy 1~3 doublewords so the main loop starts
|
|
at a multiple of 32 bytes. */
|
|
|
|
bf 30,1f
|
|
lfd 6,0(12)
|
|
lfd 7,8(12)
|
|
addi 11,12,16
|
|
mtctr 8
|
|
stfd 6,0(3)
|
|
stfd 7,8(3)
|
|
addi 10,3,16
|
|
bf 31,4f
|
|
lfd 0,16(12)
|
|
stfd 0,16(3)
|
|
blt cr1,3f
|
|
addi 11,12,24
|
|
addi 10,3,24
|
|
b 4f
|
|
|
|
.align 4
|
|
1: /* Copy 1 doubleword and set the counter. */
|
|
mr 10,3
|
|
mtctr 8
|
|
bf 31,4f
|
|
lfd 6,0(12)
|
|
addi 11,12,8
|
|
stfd 6,0(3)
|
|
addi 10,3,8
|
|
|
|
L(aligned_copy):
|
|
/* Main aligned copy loop. Copies up to 128-bytes at a time. */
|
|
.align 4
|
|
4:
|
|
/* check for any 32-byte or 64-byte lumps that are outside of a
|
|
nice 128-byte range. R8 contains the number of 32-byte
|
|
lumps, so drop this into the CR, and use the SO/EQ bits to help
|
|
handle the 32- or 64- byte lumps. Then handle the rest with an
|
|
unrolled 128-bytes-at-a-time copy loop. */
|
|
mtocrf 1,8
|
|
li 6,16 # 16() index
|
|
li 7,32 # 32() index
|
|
li 8,48 # 48() index
|
|
|
|
L(aligned_32byte):
|
|
/* if the SO bit (indicating a 32-byte lump) is not set, move along. */
|
|
bns cr7,L(aligned_64byte)
|
|
lxvd2x 6,0,11
|
|
lxvd2x 7,11,6
|
|
addi 11,11,32
|
|
stxvd2x 6,0,10
|
|
stxvd2x 7,10,6
|
|
addi 10,10,32
|
|
|
|
L(aligned_64byte):
|
|
/* if the EQ bit (indicating a 64-byte lump) is not set, move along. */
|
|
bne cr7,L(aligned_128setup)
|
|
lxvd2x 6,0,11
|
|
lxvd2x 7,11,6
|
|
lxvd2x 8,11,7
|
|
lxvd2x 9,11,8
|
|
addi 11,11,64
|
|
stxvd2x 6,0,10
|
|
stxvd2x 7,10,6
|
|
stxvd2x 8,10,7
|
|
stxvd2x 9,10,8
|
|
addi 10,10,64
|
|
|
|
L(aligned_128setup):
|
|
/* Set up for the 128-byte at a time copy loop. */
|
|
srwi 8,31,7
|
|
cmpwi 8,0 # Any 4x lumps left?
|
|
beq 3f # if not, move along.
|
|
lxvd2x 6,0,11
|
|
lxvd2x 7,11,6
|
|
mtctr 8 # otherwise, load the ctr and begin.
|
|
li 8,48 # 48() index
|
|
b L(aligned_128loop)
|
|
|
|
L(aligned_128head):
|
|
/* for the 2nd + iteration of this loop. */
|
|
lxvd2x 6,0,11
|
|
lxvd2x 7,11,6
|
|
L(aligned_128loop):
|
|
lxvd2x 8,11,7
|
|
lxvd2x 9,11,8
|
|
stxvd2x 6,0,10
|
|
addi 11,11,64
|
|
stxvd2x 7,10,6
|
|
stxvd2x 8,10,7
|
|
stxvd2x 9,10,8
|
|
lxvd2x 6,0,11
|
|
lxvd2x 7,11,6
|
|
addi 10,10,64
|
|
lxvd2x 8,11,7
|
|
lxvd2x 9,11,8
|
|
addi 11,11,64
|
|
stxvd2x 6,0,10
|
|
stxvd2x 7,10,6
|
|
stxvd2x 8,10,7
|
|
stxvd2x 9,10,8
|
|
addi 10,10,64
|
|
bdnz L(aligned_128head)
|
|
|
|
3:
|
|
/* Check for tail bytes. */
|
|
clrrwi 0,31,3
|
|
mtcrf 0x01,31
|
|
beq cr6,0f
|
|
|
|
.L9:
|
|
add 3,3,0
|
|
add 12,12,0
|
|
|
|
/* At this point we have a tail of 0-7 bytes and we know that the
|
|
destination is doubleword-aligned. */
|
|
4: /* Copy 4 bytes. */
|
|
bf 29,2f
|
|
|
|
lwz 6,0(12)
|
|
addi 12,12,4
|
|
stw 6,0(3)
|
|
addi 3,3,4
|
|
2: /* Copy 2 bytes. */
|
|
bf 30,1f
|
|
|
|
lhz 6,0(12)
|
|
addi 12,12,2
|
|
sth 6,0(3)
|
|
addi 3,3,2
|
|
1: /* Copy 1 byte. */
|
|
bf 31,0f
|
|
|
|
lbz 6,0(12)
|
|
stb 6,0(3)
|
|
0: /* Return original DST pointer. */
|
|
mr 3,30
|
|
lwz 30,20(1)
|
|
lwz 31,24(1)
|
|
addi 1,1,32
|
|
blr
|
|
|
|
/* Handle copies of 0~31 bytes. */
|
|
.align 4
|
|
L(copy_LT_32):
|
|
cmplwi cr6,5,8
|
|
mr 12,4
|
|
mtcrf 0x01,5
|
|
ble cr6,L(copy_LE_8)
|
|
|
|
/* At least 9 bytes to go. */
|
|
neg 8,4
|
|
clrrwi 11,4,2
|
|
andi. 0,8,3
|
|
cmplwi cr1,5,16
|
|
mr 10,5
|
|
beq L(copy_LT_32_aligned)
|
|
|
|
/* Force 4-bytes alignment for SRC. */
|
|
mtocrf 0x01,0
|
|
subf 10,0,5
|
|
2: bf 30,1f
|
|
|
|
lhz 6,0(12)
|
|
addi 12,12,2
|
|
sth 6,0(3)
|
|
addi 3,3,2
|
|
1: bf 31,L(end_4bytes_alignment)
|
|
|
|
lbz 6,0(12)
|
|
addi 12,12,1
|
|
stb 6,0(3)
|
|
addi 3,3,1
|
|
|
|
.align 4
|
|
L(end_4bytes_alignment):
|
|
cmplwi cr1,10,16
|
|
mtcrf 0x01,10
|
|
|
|
L(copy_LT_32_aligned):
|
|
/* At least 6 bytes to go, and SRC is word-aligned. */
|
|
blt cr1,8f
|
|
|
|
/* Copy 16 bytes. */
|
|
lwz 6,0(12)
|
|
lwz 7,4(12)
|
|
stw 6,0(3)
|
|
lwz 8,8(12)
|
|
stw 7,4(3)
|
|
lwz 6,12(12)
|
|
addi 12,12,16
|
|
stw 8,8(3)
|
|
stw 6,12(3)
|
|
addi 3,3,16
|
|
8: /* Copy 8 bytes. */
|
|
bf 28,4f
|
|
|
|
lwz 6,0(12)
|
|
lwz 7,4(12)
|
|
addi 12,12,8
|
|
stw 6,0(3)
|
|
stw 7,4(3)
|
|
addi 3,3,8
|
|
4: /* Copy 4 bytes. */
|
|
bf 29,2f
|
|
|
|
lwz 6,0(12)
|
|
addi 12,12,4
|
|
stw 6,0(3)
|
|
addi 3,3,4
|
|
2: /* Copy 2-3 bytes. */
|
|
bf 30,1f
|
|
|
|
lhz 6,0(12)
|
|
sth 6,0(3)
|
|
bf 31,0f
|
|
lbz 7,2(12)
|
|
stb 7,2(3)
|
|
|
|
/* Return original DST pointer. */
|
|
mr 3,30
|
|
lwz 30,20(1)
|
|
addi 1,1,32
|
|
blr
|
|
|
|
.align 4
|
|
1: /* Copy 1 byte. */
|
|
bf 31,0f
|
|
|
|
lbz 6,0(12)
|
|
stb 6,0(3)
|
|
0: /* Return original DST pointer. */
|
|
mr 3,30
|
|
lwz 30,20(1)
|
|
addi 1,1,32
|
|
blr
|
|
|
|
/* Handles copies of 0~8 bytes. */
|
|
.align 4
|
|
L(copy_LE_8):
|
|
bne cr6,4f
|
|
|
|
/* Though we could've used lfd/stfd here, they are still
|
|
slow for unaligned cases. */
|
|
|
|
lwz 6,0(4)
|
|
lwz 7,4(4)
|
|
stw 6,0(3)
|
|
stw 7,4(3)
|
|
|
|
/* Return original DST pointer. */
|
|
mr 3,30
|
|
lwz 30,20(1)
|
|
addi 1,1,32
|
|
blr
|
|
|
|
.align 4
|
|
4: /* Copies 4~7 bytes. */
|
|
bf 29,2b
|
|
|
|
lwz 6,0(4)
|
|
stw 6,0(3)
|
|
bf 30,5f
|
|
lhz 7,4(4)
|
|
sth 7,4(3)
|
|
bf 31,0f
|
|
lbz 8,6(4)
|
|
stb 8,6(3)
|
|
|
|
/* Return original DST pointer. */
|
|
mr 3,30
|
|
lwz 30,20(1)
|
|
addi 1,1,32
|
|
blr
|
|
|
|
.align 4
|
|
5: /* Copy 1 byte. */
|
|
bf 31,0f
|
|
|
|
lbz 6,4(4)
|
|
stb 6,4(3)
|
|
|
|
0: /* Return original DST pointer. */
|
|
mr 3,30
|
|
lwz 30,20(1)
|
|
addi 1,1,32
|
|
blr
|
|
|
|
/* Handle copies of 32+ bytes where DST is aligned (to quadword) but
|
|
SRC is not. Use aligned quadword loads from SRC, shifted to realign
|
|
the data, allowing for aligned DST stores. */
|
|
.align 4
|
|
L(copy_GE_32_unaligned):
|
|
andi. 11,3,15 /* Check alignment of DST. */
|
|
clrlwi 0,0,28 /* Number of bytes until the 1st
|
|
quadword of DST. */
|
|
srwi 9,5,4 /* Number of full quadwords remaining. */
|
|
|
|
beq L(copy_GE_32_unaligned_cont)
|
|
|
|
/* SRC is not quadword aligned, get it aligned. */
|
|
|
|
mtcrf 0x01,0
|
|
subf 31,0,5
|
|
|
|
/* Vector instructions work best when proper alignment (16-bytes)
|
|
is present. Move 0~15 bytes as needed to get DST quadword-aligned. */
|
|
1: /* Copy 1 byte. */
|
|
bf 31,2f
|
|
|
|
lbz 6,0(12)
|
|
addi 12,12,1
|
|
stb 6,0(3)
|
|
addi 3,3,1
|
|
2: /* Copy 2 bytes. */
|
|
bf 30,4f
|
|
|
|
lhz 6,0(12)
|
|
addi 12,12,2
|
|
sth 6,0(3)
|
|
addi 3,3,2
|
|
4: /* Copy 4 bytes. */
|
|
bf 29,8f
|
|
|
|
lwz 6,0(12)
|
|
addi 12,12,4
|
|
stw 6,0(3)
|
|
addi 3,3,4
|
|
8: /* Copy 8 bytes. */
|
|
bf 28,0f
|
|
|
|
lfd 6,0(12)
|
|
addi 12,12,8
|
|
stfd 6,0(3)
|
|
addi 3,3,8
|
|
0:
|
|
clrlwi 10,12,28 /* Check alignment of SRC. */
|
|
srwi 9,31,4 /* Number of full quadwords remaining. */
|
|
|
|
/* The proper alignment is present, it is OK to copy the bytes now. */
|
|
L(copy_GE_32_unaligned_cont):
|
|
|
|
/* Setup two indexes to speed up the indexed vector operations. */
|
|
clrlwi 11,31,28
|
|
li 6,16 /* Index for 16-bytes offsets. */
|
|
li 7,32 /* Index for 32-bytes offsets. */
|
|
cmplwi cr1,11,0
|
|
srwi 8,31,5 /* Setup the loop counter. */
|
|
mr 10,3
|
|
mr 11,12
|
|
mtcrf 0x01,9
|
|
cmplwi cr6,9,1
|
|
lvsl 5,0,12
|
|
lvx 3,0,12
|
|
bf 31,L(setup_unaligned_loop)
|
|
|
|
/* Copy another 16 bytes to align to 32-bytes due to the loop . */
|
|
lvx 4,12,6
|
|
vperm 6,3,4,5
|
|
addi 11,12,16
|
|
addi 10,3,16
|
|
stvx 6,0,3
|
|
vor 3,4,4
|
|
|
|
L(setup_unaligned_loop):
|
|
mtctr 8
|
|
ble cr6,L(end_unaligned_loop)
|
|
|
|
/* Copy 32 bytes at a time using vector instructions. */
|
|
.align 4
|
|
L(unaligned_loop):
|
|
|
|
/* Note: vr6/vr10 may contain data that was already copied,
|
|
but in order to get proper alignment, we may have to copy
|
|
some portions again. This is faster than having unaligned
|
|
vector instructions though. */
|
|
|
|
lvx 4,11,6 /* vr4 = r11+16. */
|
|
vperm 6,3,4,5 /* Merge the correctly-aligned portions
|
|
of vr3/vr4 into vr6. */
|
|
lvx 3,11,7 /* vr3 = r11+32. */
|
|
vperm 10,4,3,5 /* Merge the correctly-aligned portions
|
|
of vr3/vr4 into vr10. */
|
|
addi 11,11,32
|
|
stvx 6,0,10
|
|
stvx 10,10,6
|
|
addi 10,10,32
|
|
|
|
bdnz L(unaligned_loop)
|
|
|
|
.align 4
|
|
L(end_unaligned_loop):
|
|
|
|
/* Check for tail bytes. */
|
|
clrrwi 0,31,4
|
|
mtcrf 0x01,31
|
|
beq cr1,0f
|
|
|
|
add 3,3,0
|
|
add 12,12,0
|
|
|
|
/* We have 1~15 tail bytes to copy, and DST is quadword aligned. */
|
|
8: /* Copy 8 bytes. */
|
|
bf 28,4f
|
|
|
|
lwz 6,0(12)
|
|
lwz 7,4(12)
|
|
addi 12,12,8
|
|
stw 6,0(3)
|
|
stw 7,4(3)
|
|
addi 3,3,8
|
|
4: /* Copy 4 bytes. */
|
|
bf 29,2f
|
|
|
|
lwz 6,0(12)
|
|
addi 12,12,4
|
|
stw 6,0(3)
|
|
addi 3,3,4
|
|
2: /* Copy 2~3 bytes. */
|
|
bf 30,1f
|
|
|
|
lhz 6,0(12)
|
|
addi 12,12,2
|
|
sth 6,0(3)
|
|
addi 3,3,2
|
|
1: /* Copy 1 byte. */
|
|
bf 31,0f
|
|
|
|
lbz 6,0(12)
|
|
stb 6,0(3)
|
|
0: /* Return original DST pointer. */
|
|
mr 3,30
|
|
lwz 30,20(1)
|
|
lwz 31,24(1)
|
|
addi 1,1,32
|
|
blr
|
|
|
|
END (BP_SYM (memcpy))
|
|
libc_hidden_builtin_def (memcpy)
|