/* strrchr (str, ch) -- Return pointer to last occurrence of CH in STR. Copyright (C) 2013-2017 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 . */ #include .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)