91 lines
3.2 KiB
ArmAsm
91 lines
3.2 KiB
ArmAsm
/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
|
|
│vi: set et ft=asm ts=8 tw=8 fenc=utf-8 :vi│
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2020 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ This program is free software; you can redistribute it and/or modify │
|
|
│ it under the terms of the GNU General Public License as published by │
|
|
│ the Free Software Foundation; version 2 of the License. │
|
|
│ │
|
|
│ This program 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 │
|
|
│ General Public License for more details. │
|
|
│ │
|
|
│ You should have received a copy of the GNU General Public License │
|
|
│ along with this program; if not, write to the Free Software │
|
|
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
|
|
│ 02110-1301 USA │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/macros.h"
|
|
|
|
/ Compares NUL-terminated strings w/ AVX (2011+)
|
|
/
|
|
/ @param rdi first string
|
|
/ @param rsi second string
|
|
/ @return 0 if equal, etc.
|
|
/ @asyncsignalsafe
|
|
strcmp$avx:
|
|
or $-1,%rdx
|
|
/ fallthrough
|
|
.endfn strcmp$avx,globl,hidden
|
|
|
|
/ Compares NUL-terminated strings, with byte limit.
|
|
/
|
|
/ @param rdi first string
|
|
/ @param rsi second string
|
|
/ @param rdx maximum number of bytes to compare
|
|
/ @return 0 if equal, etc.
|
|
/ @asyncsignalsafe
|
|
strncmp$avx:
|
|
.leafprologue
|
|
.profilable
|
|
cmp %rsi,%rdi
|
|
je 1f
|
|
mov $-16,%rcx
|
|
vpxor %xmm0,%xmm0,%xmm0
|
|
vpcmpeqd %xmm1,%xmm1,%xmm1
|
|
3: add $16,%rcx
|
|
4: lea 16(%rcx),%rax
|
|
cmp %rdx,%rax
|
|
ja 9f
|
|
lea (%rdi,%rcx),%eax
|
|
and $0xfff,%eax
|
|
cmp $0xff0,%eax
|
|
ja 9f
|
|
lea (%rsi,%rcx),%eax
|
|
and $0xfff,%eax
|
|
cmp $0xff0,%eax
|
|
jbe 7f
|
|
9: cmpq %rcx,%rdx
|
|
je 1f
|
|
movzbl (%rdi,%rcx),%r8d
|
|
movzbl (%rsi,%rcx),%r9d
|
|
mov %r8d,%eax
|
|
sub %r9d,%eax
|
|
testl %r8d,%r8d
|
|
je 5f
|
|
incq %rcx
|
|
testl %eax,%eax
|
|
je 4b
|
|
jmp 5f
|
|
1: xor %eax,%eax
|
|
5: .leafepilogue
|
|
7: vmovdqu (%rsi,%rcx),%xmm3
|
|
vpcmpeqb (%rdi,%rcx),%xmm3,%xmm2
|
|
vpcmpeqb %xmm0,%xmm3,%xmm3
|
|
vpandn %xmm1,%xmm2,%xmm2
|
|
vpor %xmm3,%xmm2,%xmm2
|
|
vpmovmskb %xmm2,%eax
|
|
bsf %eax,%eax
|
|
jz 3b
|
|
mov %eax,%edx
|
|
add %rdx,%rdi
|
|
movzbl (%rcx,%rdi),%eax
|
|
add %rdx,%rsi
|
|
movzbl (%rcx,%rsi),%ecx
|
|
sub %ecx,%eax
|
|
jmp 5b
|
|
.endfn strncmp$avx,globl,hidden
|
|
.source __FILE__
|