2009-04-14 05:58:16 +00:00
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/* strrchr (str, ch) -- Return pointer to last occurrence of CH in STR.
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For AMD x86-64.
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Copyright (C) 2009 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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2012-02-09 23:18:22 +00:00
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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2009-04-14 05:58:16 +00:00
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#include <sysdep.h>
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.text
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ENTRY (strrchr)
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movd %esi, %xmm1
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movq %rdi, %rcx
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punpcklbw %xmm1, %xmm1
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andq $~15, %rdi
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pxor %xmm2, %xmm2
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punpcklbw %xmm1, %xmm1
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orl $0xffffffff, %esi
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movdqa (%rdi), %xmm0
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pshufd $0, %xmm1, %xmm1
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subq %rdi, %rcx
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movdqa %xmm0, %xmm3
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leaq 16(%rdi), %rdi
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pcmpeqb %xmm1, %xmm0
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pcmpeqb %xmm2, %xmm3
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shl %cl, %esi
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pmovmskb %xmm0, %edx
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pmovmskb %xmm3, %ecx
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andl %esi, %edx
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andl %esi, %ecx
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xorl %eax, %eax
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movl %edx, %esi
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orl %ecx, %esi
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jnz 1f
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2: movdqa (%rdi), %xmm0
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leaq 16(%rdi), %rdi
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movdqa %xmm0, %xmm3
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pcmpeqb %xmm1, %xmm0
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pcmpeqb %xmm2, %xmm3
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pmovmskb %xmm0, %edx
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pmovmskb %xmm3, %ecx
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movl %edx, %esi
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orl %ecx, %esi
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jz 2b
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1: bsfl %ecx, %r9d
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movl $0xffffffff, %r8d
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movl $31, %ecx
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jnz 5f
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bsrl %edx, %edx
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jz 2b
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leaq -16(%rdi,%rdx), %rax
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jmp 2b
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5: subl %r9d, %ecx
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shrl %cl, %r8d
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andl %r8d, %edx
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bsrl %edx, %edx
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jz 4f
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leaq -16(%rdi,%rdx), %rax
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4: ret
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END (strrchr)
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weak_alias (strrchr, rindex)
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libc_hidden_builtin_def (strrchr)
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