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/* strrchr (str, ch) -- Return pointer to last occurrence of CH in STR.
Copyright (C) 2013-2021 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>
.text
ENTRY (strrchr)
movd %esi, %xmm1
movq %rdi, %rax
andl $4095, %eax
punpcklbw %xmm1, %xmm1
cmpq $4032, %rax
punpcklwd %xmm1, %xmm1
pshufd $0, %xmm1, %xmm1
ja L(cross_page)
movdqu (%rdi), %xmm0
pxor %xmm2, %xmm2
movdqa %xmm0, %xmm3
pcmpeqb %xmm1, %xmm0
pcmpeqb %xmm2, %xmm3
pmovmskb %xmm0, %ecx
pmovmskb %xmm3, %edx
testq %rdx, %rdx
je L(next_48_bytes)
leaq -1(%rdx), %rax
xorq %rdx, %rax
andq %rcx, %rax
je L(exit)
bsrq %rax, %rax
addq %rdi, %rax
ret
.p2align 4
L(next_48_bytes):
movdqu 16(%rdi), %xmm4
movdqa %xmm4, %xmm5
movdqu 32(%rdi), %xmm3
pcmpeqb %xmm1, %xmm4
pcmpeqb %xmm2, %xmm5
movdqu 48(%rdi), %xmm0
pmovmskb %xmm5, %edx
movdqa %xmm3, %xmm5
pcmpeqb %xmm1, %xmm3
pcmpeqb %xmm2, %xmm5
pcmpeqb %xmm0, %xmm2
salq $16, %rdx
pmovmskb %xmm3, %r8d
pmovmskb %xmm5, %eax
pmovmskb %xmm2, %esi
salq $32, %r8
salq $32, %rax
pcmpeqb %xmm1, %xmm0
orq %rdx, %rax
movq %rsi, %rdx
pmovmskb %xmm4, %esi
salq $48, %rdx
salq $16, %rsi
orq %r8, %rsi
orq %rcx, %rsi
pmovmskb %xmm0, %ecx
salq $48, %rcx
orq %rcx, %rsi
orq %rdx, %rax
je L(loop_header2)
leaq -1(%rax), %rcx
xorq %rax, %rcx
andq %rcx, %rsi
je L(exit)
bsrq %rsi, %rsi
leaq (%rdi,%rsi), %rax
ret
.p2align 4
L(loop_header2):
testq %rsi, %rsi
movq %rdi, %rcx
je L(no_c_found)
L(loop_header):
addq $64, %rdi
pxor %xmm7, %xmm7
andq $-64, %rdi
jmp L(loop_entry)
.p2align 4
L(loop64):
testq %rdx, %rdx
cmovne %rdx, %rsi
cmovne %rdi, %rcx
addq $64, %rdi
L(loop_entry):
movdqa 32(%rdi), %xmm3
pxor %xmm6, %xmm6
movdqa 48(%rdi), %xmm2
movdqa %xmm3, %xmm0
movdqa 16(%rdi), %xmm4
pminub %xmm2, %xmm0
movdqa (%rdi), %xmm5
pminub %xmm4, %xmm0
pminub %xmm5, %xmm0
pcmpeqb %xmm7, %xmm0
pmovmskb %xmm0, %eax
movdqa %xmm5, %xmm0
pcmpeqb %xmm1, %xmm0
pmovmskb %xmm0, %r9d
movdqa %xmm4, %xmm0
pcmpeqb %xmm1, %xmm0
pmovmskb %xmm0, %edx
movdqa %xmm3, %xmm0
pcmpeqb %xmm1, %xmm0
salq $16, %rdx
pmovmskb %xmm0, %r10d
movdqa %xmm2, %xmm0
pcmpeqb %xmm1, %xmm0
salq $32, %r10
orq %r10, %rdx
pmovmskb %xmm0, %r8d
orq %r9, %rdx
salq $48, %r8
orq %r8, %rdx
testl %eax, %eax
je L(loop64)
pcmpeqb %xmm6, %xmm4
pcmpeqb %xmm6, %xmm3
pcmpeqb %xmm6, %xmm5
pmovmskb %xmm4, %eax
pmovmskb %xmm3, %r10d
pcmpeqb %xmm6, %xmm2
pmovmskb %xmm5, %r9d
salq $32, %r10
salq $16, %rax
pmovmskb %xmm2, %r8d
orq %r10, %rax
orq %r9, %rax
salq $48, %r8
orq %r8, %rax
leaq -1(%rax), %r8
xorq %rax, %r8
andq %r8, %rdx
cmovne %rdi, %rcx
cmovne %rdx, %rsi
bsrq %rsi, %rsi
leaq (%rcx,%rsi), %rax
ret
.p2align 4
L(no_c_found):
movl $1, %esi
xorl %ecx, %ecx
jmp L(loop_header)
.p2align 4
L(exit):
xorl %eax, %eax
ret
.p2align 4
L(cross_page):
movq %rdi, %rax
pxor %xmm0, %xmm0
andq $-64, %rax
movdqu (%rax), %xmm5
movdqa %xmm5, %xmm6
movdqu 16(%rax), %xmm4
pcmpeqb %xmm1, %xmm5
pcmpeqb %xmm0, %xmm6
movdqu 32(%rax), %xmm3
pmovmskb %xmm6, %esi
movdqa %xmm4, %xmm6
movdqu 48(%rax), %xmm2
pcmpeqb %xmm1, %xmm4
pcmpeqb %xmm0, %xmm6
pmovmskb %xmm6, %edx
movdqa %xmm3, %xmm6
pcmpeqb %xmm1, %xmm3
pcmpeqb %xmm0, %xmm6
pcmpeqb %xmm2, %xmm0
salq $16, %rdx
pmovmskb %xmm3, %r9d
pmovmskb %xmm6, %r8d
pmovmskb %xmm0, %ecx
salq $32, %r9
salq $32, %r8
pcmpeqb %xmm1, %xmm2
orq %r8, %rdx
salq $48, %rcx
pmovmskb %xmm5, %r8d
orq %rsi, %rdx
pmovmskb %xmm4, %esi
orq %rcx, %rdx
pmovmskb %xmm2, %ecx
salq $16, %rsi
salq $48, %rcx
orq %r9, %rsi
orq %r8, %rsi
orq %rcx, %rsi
movl %edi, %ecx
subl %eax, %ecx
shrq %cl, %rdx
shrq %cl, %rsi
testq %rdx, %rdx
je L(loop_header2)
leaq -1(%rdx), %rax
xorq %rdx, %rax
andq %rax, %rsi
je L(exit)
bsrq %rsi, %rax
addq %rdi, %rax
ret
END (strrchr)
weak_alias (strrchr, rindex)
libc_hidden_builtin_def (strrchr)
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