mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-27 13:10:29 +00:00
688903eb3e
* All files with FSF copyright notices: Update copyright dates using scripts/update-copyrights. * locale/programs/charmap-kw.h: Regenerated. * locale/programs/locfile-kw.h: Likewise.
432 lines
6.8 KiB
ArmAsm
432 lines
6.8 KiB
ArmAsm
/* Optimized memset implementation for PowerPC32/POWER7.
|
|
Copyright (C) 2010-2018 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>
|
|
|
|
/* void * [r3] memset (void *s [r3], int c [r4], size_t n [r5]));
|
|
Returns 's'. */
|
|
|
|
.machine power7
|
|
EALIGN (memset, 5, 0)
|
|
CALL_MCOUNT
|
|
|
|
.align 4
|
|
L(_memset):
|
|
cmplwi cr7,5,31
|
|
cmplwi cr6,5,8
|
|
mr 10,3 /* Save original argument for later. */
|
|
mr 7,1 /* Save original r1 for later. */
|
|
cfi_offset(31,-8)
|
|
|
|
/* Replicate byte to word. */
|
|
insrwi 4,4,8,16
|
|
insrwi 4,4,16,0
|
|
|
|
ble cr6,L(small) /* If length <= 8, use short copy code. */
|
|
|
|
neg 0,3
|
|
ble cr7,L(medium) /* If length < 32, use medium copy code. */
|
|
|
|
/* Save our word twice to create a doubleword that we will later
|
|
copy to a FPR. */
|
|
stwu 1,-32(1)
|
|
andi. 11,10,7 /* Check alignment of DST. */
|
|
mr 12,5
|
|
stw 4,24(1)
|
|
stw 4,28(1)
|
|
beq L(big_aligned)
|
|
|
|
clrlwi 0,0,29
|
|
mtocrf 0x01,0
|
|
subf 5,0,5
|
|
|
|
/* Get DST aligned to 8 bytes. */
|
|
1: bf 31,2f
|
|
|
|
stb 4,0(10)
|
|
addi 10,10,1
|
|
2: bf 30,4f
|
|
|
|
sth 4,0(10)
|
|
addi 10,10,2
|
|
4: bf 29,L(big_aligned)
|
|
|
|
stw 4,0(10)
|
|
addi 10,10,4
|
|
|
|
.align 4
|
|
L(big_aligned):
|
|
cmplwi cr5,5,255
|
|
li 0,32
|
|
cmplwi cr1,5,160
|
|
dcbtst 0,10
|
|
cmplwi cr6,4,0
|
|
srwi 9,5,3 /* Number of full doublewords remaining. */
|
|
crand 27,26,21
|
|
mtocrf 0x01,9
|
|
bt 27,L(huge)
|
|
|
|
/* From this point on, we'll copy 32+ bytes and the value
|
|
isn't 0 (so we can't use dcbz). */
|
|
|
|
srwi 8,5,5
|
|
clrlwi 11,5,29
|
|
cmplwi cr6,11,0
|
|
cmplwi cr1,9,4
|
|
mtctr 8
|
|
|
|
/* Copy 1~3 doublewords so the main loop starts
|
|
at a multiple of 32 bytes. */
|
|
|
|
bf 30,1f
|
|
|
|
stw 4,0(10)
|
|
stw 4,4(10)
|
|
stw 4,8(10)
|
|
stw 4,12(10)
|
|
addi 10,10,16
|
|
bf 31,L(big_loop)
|
|
|
|
stw 4,0(10)
|
|
stw 4,4(10)
|
|
addi 10,10,8
|
|
mr 12,10
|
|
blt cr1,L(tail_bytes)
|
|
|
|
b L(big_loop)
|
|
|
|
.align 4
|
|
1: /* Copy 1 doubleword. */
|
|
bf 31,L(big_loop)
|
|
|
|
stw 4,0(10)
|
|
stw 4,4(10)
|
|
addi 10,10,8
|
|
|
|
/* First use a 32-bytes loop with stw's to try and avoid the LHS due
|
|
to the lfd we will do next. Also, ping-pong through r10 and r12
|
|
to avoid AGEN delays. */
|
|
.align 4
|
|
L(big_loop):
|
|
addi 12,10,32
|
|
stw 4,0(10)
|
|
stw 4,4(10)
|
|
stw 4,8(10)
|
|
stw 4,12(10)
|
|
stw 4,16(10)
|
|
stw 4,20(10)
|
|
stw 4,24(10)
|
|
stw 4,28(10)
|
|
bdz L(tail_bytes)
|
|
|
|
addi 10,10,64
|
|
stw 4,0(12)
|
|
stw 4,4(12)
|
|
stw 4,8(12)
|
|
stw 4,12(12)
|
|
stw 4,16(12)
|
|
stw 4,20(12)
|
|
stw 4,24(12)
|
|
stw 4,28(12)
|
|
bdnz L(big_loop_fast_setup)
|
|
|
|
mr 12,10
|
|
b L(tail_bytes)
|
|
|
|
/* Now that we're probably past the LHS window, use the VSX to
|
|
speed up the loop. */
|
|
L(big_loop_fast_setup):
|
|
li 11,24
|
|
li 6,16
|
|
lxvdsx 4,1,11
|
|
|
|
.align 4
|
|
L(big_loop_fast):
|
|
addi 12,10,32
|
|
stxvd2x 4,0,10
|
|
stxvd2x 4,10,6
|
|
bdz L(tail_bytes)
|
|
|
|
addi 10,10,64
|
|
stxvd2x 4,0,12
|
|
stxvd2x 4,12,6
|
|
bdnz L(big_loop_fast)
|
|
|
|
mr 12,10
|
|
|
|
.align 4
|
|
L(tail_bytes):
|
|
|
|
/* Check for tail bytes. */
|
|
mr 1,7 /* Restore r1. */
|
|
beqlr cr6
|
|
|
|
clrlwi 0,5,29
|
|
mtocrf 0x01,0
|
|
|
|
/* 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
|
|
|
|
stw 4,0(12)
|
|
addi 12,12,4
|
|
2: /* Copy 2 bytes. */
|
|
bf 30,1f
|
|
|
|
sth 4,0(12)
|
|
addi 12,12,2
|
|
1: /* Copy 1 byte. */
|
|
bflr 31
|
|
|
|
stb 4,0(12)
|
|
blr
|
|
|
|
|
|
/* Special case when value is 0 and we have a long length to deal
|
|
with. Use dcbz to zero out 128-bytes at a time. Before using
|
|
dcbz though, we need to get the destination 128-bytes aligned. */
|
|
.align 4
|
|
L(huge):
|
|
lfd 4,24(1)
|
|
andi. 11,10,127
|
|
neg 0,10
|
|
beq L(huge_aligned)
|
|
|
|
clrlwi 0,0,25
|
|
subf 5,0,5
|
|
srwi 0,0,3
|
|
mtocrf 0x01,0
|
|
|
|
/* Get DST aligned to 128 bytes. */
|
|
8: bf 28,4f
|
|
|
|
stfd 4,0(10)
|
|
stfd 4,8(10)
|
|
stfd 4,16(10)
|
|
stfd 4,24(10)
|
|
stfd 4,32(10)
|
|
stfd 4,40(10)
|
|
stfd 4,48(10)
|
|
stfd 4,56(10)
|
|
addi 10,10,64
|
|
.align 4
|
|
4: bf 29,2f
|
|
|
|
stfd 4,0(10)
|
|
stfd 4,8(10)
|
|
stfd 4,16(10)
|
|
stfd 4,24(10)
|
|
addi 10,10,32
|
|
.align 4
|
|
2: bf 30,1f
|
|
|
|
stfd 4,0(10)
|
|
stfd 4,8(10)
|
|
addi 10,10,16
|
|
.align 4
|
|
1: bf 31,L(huge_aligned)
|
|
|
|
stfd 4,0(10)
|
|
addi 10,10,8
|
|
|
|
L(huge_aligned):
|
|
srwi 8,5,7
|
|
clrlwi 11,5,25
|
|
cmplwi cr6,11,0
|
|
mtctr 8
|
|
|
|
/* Copies 128-bytes at a time. */
|
|
.align 4
|
|
L(huge_loop):
|
|
dcbz 0,10
|
|
addi 10,10,128
|
|
bdnz L(huge_loop)
|
|
|
|
/* We have a tail of 0~127 bytes to handle. */
|
|
mr 1,7 /* Restore r1. */
|
|
beqlr cr6
|
|
|
|
subf 9,3,10
|
|
subf 5,9,12
|
|
srwi 8,5,3
|
|
cmplwi cr6,8,0
|
|
mtocrf 0x01,8
|
|
|
|
/* We have a tail o 1~127 bytes. Copy up to 15 doublewords for
|
|
speed. We'll handle the resulting tail bytes later. */
|
|
beq cr6,L(tail)
|
|
|
|
8: bf 28,4f
|
|
|
|
stfd 4,0(10)
|
|
stfd 4,8(10)
|
|
stfd 4,16(10)
|
|
stfd 4,24(10)
|
|
stfd 4,32(10)
|
|
stfd 4,40(10)
|
|
stfd 4,48(10)
|
|
stfd 4,56(10)
|
|
addi 10,10,64
|
|
.align 4
|
|
4: bf 29,2f
|
|
|
|
stfd 4,0(10)
|
|
stfd 4,8(10)
|
|
stfd 4,16(10)
|
|
stfd 4,24(10)
|
|
addi 10,10,32
|
|
.align 4
|
|
2: bf 30,1f
|
|
|
|
stfd 4,0(10)
|
|
stfd 4,8(10)
|
|
addi 10,10,16
|
|
.align 4
|
|
1: bf 31,L(tail)
|
|
|
|
stfd 4,0(10)
|
|
addi 10,10,8
|
|
|
|
/* Handle the rest of the tail bytes here. */
|
|
L(tail):
|
|
mtocrf 0x01,5
|
|
|
|
.align 4
|
|
4: bf 29,2f
|
|
|
|
stw 4,0(10)
|
|
addi 10,10,4
|
|
.align 4
|
|
2: bf 30,1f
|
|
|
|
sth 4,0(10)
|
|
addi 10,10,2
|
|
.align 4
|
|
1: bflr 31
|
|
|
|
stb 4,0(10)
|
|
blr
|
|
|
|
|
|
/* Expanded tree to copy tail bytes without increments. */
|
|
.align 4
|
|
L(copy_tail):
|
|
bf 29,L(FXX)
|
|
|
|
stw 4,0(10)
|
|
bf 30,L(TFX)
|
|
|
|
sth 4,4(10)
|
|
bflr 31
|
|
|
|
stb 4,6(10)
|
|
blr
|
|
|
|
.align 4
|
|
L(FXX): bf 30,L(FFX)
|
|
|
|
sth 4,0(10)
|
|
bflr 31
|
|
|
|
stb 4,2(10)
|
|
blr
|
|
|
|
.align 4
|
|
L(TFX): bflr 31
|
|
|
|
stb 4,4(10)
|
|
blr
|
|
|
|
.align 4
|
|
L(FFX): bflr 31
|
|
|
|
stb 4,0(10)
|
|
blr
|
|
|
|
/* Handle copies of 9~31 bytes. */
|
|
.align 4
|
|
L(medium):
|
|
/* At least 9 bytes to go. */
|
|
andi. 11,10,3
|
|
clrlwi 0,0,30
|
|
beq L(medium_aligned)
|
|
|
|
/* Force 4-bytes alignment for DST. */
|
|
mtocrf 0x01,0
|
|
subf 5,0,5
|
|
1: /* Copy 1 byte. */
|
|
bf 31,2f
|
|
|
|
stb 4,0(10)
|
|
addi 10,10,1
|
|
2: /* Copy 2 bytes. */
|
|
bf 30,L(medium_aligned)
|
|
|
|
sth 4,0(10)
|
|
addi 10,10,2
|
|
|
|
.align 4
|
|
L(medium_aligned):
|
|
/* At least 6 bytes to go, and DST is word-aligned. */
|
|
cmplwi cr1,5,16
|
|
mtocrf 0x01,5
|
|
blt cr1,8f
|
|
|
|
/* Copy 16 bytes. */
|
|
stw 4,0(10)
|
|
stw 4,4(10)
|
|
stw 4,8(10)
|
|
stw 4,12(10)
|
|
addi 10,10,16
|
|
8: /* Copy 8 bytes. */
|
|
bf 28,4f
|
|
|
|
stw 4,0(10)
|
|
stw 4,4(10)
|
|
addi 10,10,8
|
|
4: /* Copy 4 bytes. */
|
|
bf 29,2f
|
|
|
|
stw 4,0(10)
|
|
addi 10,10,4
|
|
2: /* Copy 2-3 bytes. */
|
|
bf 30,1f
|
|
|
|
sth 4,0(10)
|
|
addi 10,10,2
|
|
1: /* Copy 1 byte. */
|
|
bflr 31
|
|
|
|
stb 4,0(10)
|
|
blr
|
|
|
|
/* Handles copies of 0~8 bytes. */
|
|
.align 4
|
|
L(small):
|
|
mtocrf 0x01,5
|
|
bne cr6,L(copy_tail)
|
|
|
|
stw 4,0(10)
|
|
stw 4,4(10)
|
|
blr
|
|
|
|
END (memset)
|
|
libc_hidden_builtin_def (memset)
|