mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-15 09:30:06 +00:00
2b778ceb40
I used these shell commands: ../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright (cd ../glibc && git commit -am"[this commit message]") and then ignored the output, which consisted lines saying "FOO: warning: copyright statement not found" for each of 6694 files FOO. I then removed trailing white space from benchtests/bench-pthread-locks.c and iconvdata/tst-iconv-big5-hkscs-to-2ucs4.c, to work around this diagnostic from Savannah: remote: *** pre-commit check failed ... remote: *** error: lines with trailing whitespace found remote: error: hook declined to update refs/heads/master
519 lines
8.6 KiB
ArmAsm
519 lines
8.6 KiB
ArmAsm
/* Optimized memset implementation for PowerPC64/POWER8.
|
|
Copyright (C) 2014-2021 Free Software Foundation, Inc.
|
|
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
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <sysdep.h>
|
|
|
|
/* void * [r3] memset (void *s [r3], int c [r4], size_t n [r5]));
|
|
Returns 's'. */
|
|
|
|
#ifndef MEMSET
|
|
# define MEMSET memset
|
|
#endif
|
|
.machine power8
|
|
ENTRY_TOCLESS (MEMSET, 5)
|
|
CALL_MCOUNT 3
|
|
|
|
L(_memset):
|
|
cmpldi cr7,r5,31
|
|
neg r0,r3
|
|
mr r10,r3
|
|
|
|
insrdi r4,r4,8,48
|
|
insrdi r4,r4,16,32 /* Replicate byte to word. */
|
|
ble cr7,L(write_LT_32)
|
|
|
|
andi. r11,r10,15 /* Check alignment of DST. */
|
|
insrdi r4,r4,32,0 /* Replicate word to double word. */
|
|
|
|
beq L(big_aligned)
|
|
|
|
mtocrf 0x01,r0
|
|
clrldi r0,r0,60
|
|
|
|
/* Get DST aligned to 16 bytes. */
|
|
1: bf 31,2f
|
|
stb r4,0(r10)
|
|
addi r10,r10,1
|
|
|
|
2: bf 30,4f
|
|
sth r4,0(r10)
|
|
addi r10,r10,2
|
|
|
|
4: bf 29,8f
|
|
stw r4,0(r10)
|
|
addi r10,r10,4
|
|
|
|
8: bf 28,16f
|
|
std r4,0(r10)
|
|
addi r10,r10,8
|
|
|
|
16: subf r5,r0,r5
|
|
|
|
.align 4
|
|
L(big_aligned):
|
|
/* For sizes larger than 255 two possible paths:
|
|
- if constant is '0', zero full cache lines with dcbz
|
|
- otherwise uses vector instructions. */
|
|
cmpldi cr5,r5,255
|
|
dcbtst 0,r10
|
|
cmpldi cr6,r4,0
|
|
crand 27,26,21
|
|
bt 27,L(huge_dcbz)
|
|
bge cr5,L(huge_vector)
|
|
|
|
|
|
/* Size between 32 and 255 bytes with constant different than 0, use
|
|
doubleword store instruction to achieve best throughput. */
|
|
srdi r8,r5,5
|
|
clrldi r11,r5,59
|
|
cmpldi cr6,r11,0
|
|
cmpdi r8,0
|
|
beq L(tail_bytes)
|
|
mtctr r8
|
|
|
|
/* Main aligned write loop, writes 32-bytes at a time. */
|
|
.align 4
|
|
L(big_loop):
|
|
std r4,0(r10)
|
|
std r4,8(r10)
|
|
std r4,16(r10)
|
|
std r4,24(r10)
|
|
addi r10,r10,32
|
|
bdz L(tail_bytes)
|
|
|
|
std r4,0(r10)
|
|
std r4,8(r10)
|
|
std r4,16(r10)
|
|
std r4,24(r10)
|
|
addi r10,10,32
|
|
bdnz L(big_loop)
|
|
|
|
b L(tail_bytes)
|
|
|
|
/* Write remaining 1~31 bytes. */
|
|
.align 4
|
|
L(tail_bytes):
|
|
beqlr cr6
|
|
|
|
srdi r7,r11,4
|
|
clrldi r8,r11,60
|
|
mtocrf 0x01,r7
|
|
|
|
.align 4
|
|
bf 31,8f
|
|
std r4,0(r10)
|
|
std r4,8(r10)
|
|
addi r10,r10,16
|
|
|
|
.align 4
|
|
8: mtocrf 0x1,r8
|
|
bf 28,4f
|
|
std r4,0(r10)
|
|
addi r10,r10,8
|
|
|
|
.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
|
|
|
|
/* Size larger than 255 bytes with constant different than 0, use
|
|
vector instruction to achieve best throughput. */
|
|
L(huge_vector):
|
|
/* Replicate set byte to quadword in VMX register. */
|
|
mtvsrd v1,r4
|
|
xxpermdi 32,v0,v1,0
|
|
vspltb v2,v0,15
|
|
|
|
/* Main aligned write loop: 128 bytes at a time. */
|
|
li r6,16
|
|
li r7,32
|
|
li r8,48
|
|
mtocrf 0x02,r5
|
|
srdi r12,r5,7
|
|
cmpdi r12,0
|
|
beq L(aligned_tail)
|
|
mtctr r12
|
|
b L(aligned_128loop)
|
|
|
|
.align 4
|
|
L(aligned_128loop):
|
|
stvx v2,0,r10
|
|
stvx v2,r10,r6
|
|
stvx v2,r10,r7
|
|
stvx v2,r10,r8
|
|
addi r10,r10,64
|
|
stvx v2,0,r10
|
|
stvx v2,r10,r6
|
|
stvx v2,r10,r7
|
|
stvx v2,r10,r8
|
|
addi r10,r10,64
|
|
bdnz L(aligned_128loop)
|
|
|
|
/* Write remaining 1~127 bytes. */
|
|
L(aligned_tail):
|
|
mtocrf 0x01,r5
|
|
bf 25,32f
|
|
stvx v2,0,r10
|
|
stvx v2,r10,r6
|
|
stvx v2,r10,r7
|
|
stvx v2,r10,r8
|
|
addi r10,r10,64
|
|
|
|
32: bf 26,16f
|
|
stvx v2,0,r10
|
|
stvx v2,r10,r6
|
|
addi r10,r10,32
|
|
|
|
16: bf 27,8f
|
|
stvx v2,0,r10
|
|
addi r10,r10,16
|
|
|
|
8: bf 28,4f
|
|
std r4,0(r10)
|
|
addi r10,r10,8
|
|
|
|
/* Copies 4~7 bytes. */
|
|
4: bf 29,L(tail2)
|
|
stw r4,0(r10)
|
|
bf 30,L(tail5)
|
|
sth r4,4(r10)
|
|
bflr 31
|
|
stb r4,6(r10)
|
|
/* Return original DST pointer. */
|
|
blr
|
|
|
|
/* Special case when value is 0 and we have a long length to deal
|
|
with. Use dcbz to zero out a full cacheline of 128 bytes at a time.
|
|
Before using dcbz though, we need to get the destination 128-byte
|
|
aligned. */
|
|
.align 4
|
|
L(huge_dcbz):
|
|
andi. r11,r10,127
|
|
neg r0,r10
|
|
beq L(huge_dcbz_aligned)
|
|
|
|
clrldi r0,r0,57
|
|
subf r5,r0,r5
|
|
srdi r0,r0,3
|
|
mtocrf 0x01,r0
|
|
|
|
/* Write 1~128 bytes until DST is aligned to 128 bytes. */
|
|
8: bf 28,4f
|
|
|
|
std r4,0(r10)
|
|
std r4,8(r10)
|
|
std r4,16(r10)
|
|
std r4,24(r10)
|
|
std r4,32(r10)
|
|
std r4,40(r10)
|
|
std r4,48(r10)
|
|
std r4,56(r10)
|
|
addi r10,r10,64
|
|
|
|
.align 4
|
|
4: bf 29,2f
|
|
std r4,0(r10)
|
|
std r4,8(r10)
|
|
std r4,16(r10)
|
|
std r4,24(r10)
|
|
addi r10,r10,32
|
|
|
|
.align 4
|
|
2: bf 30,1f
|
|
std r4,0(r10)
|
|
std r4,8(r10)
|
|
addi r10,r10,16
|
|
|
|
.align 4
|
|
1: bf 31,L(huge_dcbz_aligned)
|
|
std r4,0(r10)
|
|
addi r10,r10,8
|
|
|
|
L(huge_dcbz_aligned):
|
|
/* Setup dcbz unroll offsets and count numbers. */
|
|
srdi r8,r5,9
|
|
clrldi r11,r5,55
|
|
cmpldi cr6,r11,0
|
|
li r9,128
|
|
cmpdi r8,0
|
|
beq L(huge_tail)
|
|
li r7,256
|
|
li r6,384
|
|
mtctr r8
|
|
|
|
.align 4
|
|
L(huge_loop):
|
|
/* Sets 512 bytes to zero in each iteration, the loop unrolling shows
|
|
a throughput boost for large sizes (2048 bytes or higher). */
|
|
dcbz 0,r10
|
|
dcbz r9,r10
|
|
dcbz r7,r10
|
|
dcbz r6,r10
|
|
addi r10,r10,512
|
|
bdnz L(huge_loop)
|
|
|
|
beqlr cr6
|
|
|
|
L(huge_tail):
|
|
srdi r6,r11,8
|
|
srdi r7,r11,4
|
|
clrldi r8,r11,4
|
|
cmpldi cr6,r8,0
|
|
mtocrf 0x01,r6
|
|
|
|
beq cr6,L(tail)
|
|
|
|
/* We have 1~511 bytes remaining. */
|
|
.align 4
|
|
32: bf 31,16f
|
|
dcbz 0,r10
|
|
dcbz r9,r10
|
|
addi r10,r10,256
|
|
|
|
.align 4
|
|
16: mtocrf 0x01,r7
|
|
bf 28,8f
|
|
dcbz 0,r10
|
|
addi r10,r10,128
|
|
|
|
.align 4
|
|
8: bf 29,4f
|
|
std r4,0(r10)
|
|
std r4,8(r10)
|
|
std r4,16(r10)
|
|
std r4,24(r10)
|
|
std r4,32(r10)
|
|
std r4,40(r10)
|
|
std r4,48(r10)
|
|
std r4,56(r10)
|
|
addi r10,r10,64
|
|
|
|
.align 4
|
|
4: bf 30,2f
|
|
std r4,0(r10)
|
|
std r4,8(r10)
|
|
std r4,16(r10)
|
|
std r4,24(r10)
|
|
addi r10,r10,32
|
|
|
|
.align 4
|
|
2: bf 31,L(tail)
|
|
std r4,0(r10)
|
|
std r4,8(r10)
|
|
addi r10,r10,16
|
|
.align 4
|
|
|
|
/* Remaining 1~15 bytes. */
|
|
L(tail):
|
|
mtocrf 0x01,r8
|
|
|
|
.align
|
|
8: bf 28,4f
|
|
std r4,0(r10)
|
|
addi r10,r10,8
|
|
|
|
.align 4
|
|
4: bf 29,2f
|
|
stw r4,0(r10)
|
|
addi r10,r10,4
|
|
|
|
.align 4
|
|
2: bf 30,1f
|
|
sth r4,0(r10)
|
|
addi r10,r10,2
|
|
|
|
.align 4
|
|
1: bflr 31
|
|
stb r4,0(r10)
|
|
blr
|
|
|
|
/* Handle short copies of 0~31 bytes. Best throughput is achieved
|
|
by just unrolling all operations. */
|
|
.align 4
|
|
L(write_LT_32):
|
|
cmpldi cr6,5,8
|
|
mtocrf 0x01,r5
|
|
ble cr6,L(write_LE_8)
|
|
|
|
/* At least 9 bytes to go. */
|
|
neg r8,r4
|
|
andi. r0,r8,3
|
|
cmpldi cr1,r5,16
|
|
beq L(write_LT_32_aligned)
|
|
|
|
/* Force 4-byte alignment for SRC. */
|
|
mtocrf 0x01,r0
|
|
subf r5,r0,r5
|
|
|
|
2: bf 30,1f
|
|
/* Use stb instead of sth because it doesn't generate
|
|
alignment interrupts on cache-inhibited storage. */
|
|
stb r4,0(r10)
|
|
stb r4,1(r10)
|
|
addi r10,r10,2
|
|
|
|
1: bf 31,L(end_4bytes_alignment)
|
|
stb r4,0(r10)
|
|
addi r10,r10,1
|
|
|
|
.align 4
|
|
L(end_4bytes_alignment):
|
|
cmpldi cr1,r5,16
|
|
mtocrf 0x01,r5
|
|
|
|
L(write_LT_32_aligned):
|
|
blt cr1,8f
|
|
|
|
stw r4,0(r10)
|
|
stw r4,4(r10)
|
|
stw r4,8(r10)
|
|
stw r4,12(r10)
|
|
addi r10,r10,16
|
|
|
|
8: bf 28,L(tail4)
|
|
stw r4,0(r10)
|
|
stw r4,4(r10)
|
|
addi r10,r10,8
|
|
|
|
.align 4
|
|
/* Copies 4~7 bytes. */
|
|
L(tail4):
|
|
bf 29,L(tail2)
|
|
stw r4,0(r10)
|
|
bf 30,L(tail5)
|
|
sth r4,4(r10)
|
|
bflr 31
|
|
stb r4,6(r10)
|
|
blr
|
|
|
|
.align 4
|
|
/* Copies 2~3 bytes. */
|
|
L(tail2):
|
|
bf 30,1f
|
|
sth r4,0(r10)
|
|
bflr 31
|
|
stb r4,2(r10)
|
|
blr
|
|
|
|
.align 4
|
|
L(tail5):
|
|
bflr 31
|
|
stb r4,4(r10)
|
|
blr
|
|
|
|
.align 4
|
|
1: bflr 31
|
|
stb r4,0(r10)
|
|
blr
|
|
|
|
/* Handles copies of 0~8 bytes. */
|
|
.align 4
|
|
L(write_LE_8):
|
|
bne cr6,L(LE7_tail4)
|
|
/* If input is word aligned, use stw, else use stb. */
|
|
andi. r0,r10,3
|
|
bne L(8_unalign)
|
|
|
|
stw r4,0(r10)
|
|
stw r4,4(r10)
|
|
blr
|
|
|
|
/* Unaligned input and size is 8. */
|
|
.align 4
|
|
L(8_unalign):
|
|
andi. r0,r10,1
|
|
beq L(8_hwalign)
|
|
stb r4,0(r10)
|
|
sth r4,1(r10)
|
|
sth r4,3(r10)
|
|
sth r4,5(r10)
|
|
stb r4,7(r10)
|
|
blr
|
|
|
|
/* Halfword aligned input and size is 8. */
|
|
.align 4
|
|
L(8_hwalign):
|
|
sth r4,0(r10)
|
|
sth r4,2(r10)
|
|
sth r4,4(r10)
|
|
sth r4,6(r10)
|
|
blr
|
|
|
|
.align 4
|
|
/* Copies 4~7 bytes. */
|
|
L(LE7_tail4):
|
|
/* Use stb instead of sth because it doesn't generate
|
|
alignment interrupts on cache-inhibited storage. */
|
|
bf 29,L(LE7_tail2)
|
|
stb r4,0(r10)
|
|
stb r4,1(r10)
|
|
stb r4,2(r10)
|
|
stb r4,3(r10)
|
|
bf 30,L(LE7_tail5)
|
|
stb r4,4(r10)
|
|
stb r4,5(r10)
|
|
bflr 31
|
|
stb r4,6(r10)
|
|
blr
|
|
|
|
.align 4
|
|
/* Copies 2~3 bytes. */
|
|
L(LE7_tail2):
|
|
bf 30,1f
|
|
stb r4,0(r10)
|
|
stb r4,1(r10)
|
|
bflr 31
|
|
stb r4,2(r10)
|
|
blr
|
|
|
|
.align 4
|
|
L(LE7_tail5):
|
|
bflr 31
|
|
stb r4,4(r10)
|
|
blr
|
|
|
|
.align 4
|
|
1: bflr 31
|
|
stb r4,0(r10)
|
|
blr
|
|
|
|
END_GEN_TB (MEMSET,TB_TOCLESS)
|
|
libc_hidden_builtin_def (memset)
|
|
|
|
/* Copied from bzero.S to prevent the linker from inserting a stub
|
|
between bzero and memset. */
|
|
ENTRY_TOCLESS (__bzero)
|
|
CALL_MCOUNT 3
|
|
mr r5,r4
|
|
li r4,0
|
|
b L(_memset)
|
|
END (__bzero)
|
|
#ifndef __bzero
|
|
weak_alias (__bzero, bzero)
|
|
#endif
|