1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228
|
/* strrchr (str, ch) -- Return pointer to last occurrence of CH in STR.
Copyright (C) 2013-2014 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
<http://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)
|