diff options
Diffstat (limited to 'sysdeps/x86_64/strrchr.S')
| -rw-r--r-- | sysdeps/x86_64/strrchr.S | 238 |
1 files changed, 193 insertions, 45 deletions
diff --git a/sysdeps/x86_64/strrchr.S b/sysdeps/x86_64/strrchr.S index a5397e70f5..c07f1f9076 100644 --- a/sysdeps/x86_64/strrchr.S +++ b/sysdeps/x86_64/strrchr.S @@ -1,6 +1,5 @@ /* strrchr (str, ch) -- Return pointer to last occurrence of CH in STR. - For AMD x86-64. - Copyright (C) 2009 Free Software Foundation, Inc. + 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 @@ -17,63 +16,212 @@ License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ -#include <sysdep.h> +#include <sysdep.h> .text ENTRY (strrchr) movd %esi, %xmm1 - movq %rdi, %rcx - punpcklbw %xmm1, %xmm1 - andq $~15, %rdi - pxor %xmm2, %xmm2 - punpcklbw %xmm1, %xmm1 - orl $0xffffffff, %esi - movdqa (%rdi), %xmm0 + movq %rdi, %rax + andl $4095, %eax + punpcklbw %xmm1, %xmm1 + cmpq $4032, %rax + punpcklwd %xmm1, %xmm1 pshufd $0, %xmm1, %xmm1 - subq %rdi, %rcx + ja L(cross_page) + movdqu (%rdi), %xmm0 + pxor %xmm2, %xmm2 movdqa %xmm0, %xmm3 - leaq 16(%rdi), %rdi pcmpeqb %xmm1, %xmm0 pcmpeqb %xmm2, %xmm3 - shl %cl, %esi - pmovmskb %xmm0, %edx - pmovmskb %xmm3, %ecx - andl %esi, %edx - andl %esi, %ecx - xorl %eax, %eax - movl %edx, %esi - orl %ecx, %esi - jnz 1f + 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 -2: movdqa (%rdi), %xmm0 - leaq 16(%rdi), %rdi - movdqa %xmm0, %xmm3 + .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 - pcmpeqb %xmm2, %xmm3 - pmovmskb %xmm0, %edx - pmovmskb %xmm3, %ecx - movl %edx, %esi - orl %ecx, %esi - jz 2b + 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 -1: bsfl %ecx, %r9d - movl $0xffffffff, %r8d - movl $31, %ecx - jnz 5f + .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 - bsrl %edx, %edx - jz 2b - leaq -16(%rdi,%rdx), %rax - jmp 2b + .p2align 4 +L(no_c_found): + movl $1, %esi + xorl %ecx, %ecx + jmp L(loop_header) + + .p2align 4 +L(exit): + xorl %eax, %eax + ret -5: subl %r9d, %ecx - shrl %cl, %r8d - andl %r8d, %edx - bsrl %edx, %edx - jz 4f - leaq -16(%rdi,%rdx), %rax -4: 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) |