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Ondřej Bílka
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,210 @@ | ||
| /* strcmp with unaligned loads | ||
| Copyright (C) 2013 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" | ||
| #define ALIGN(x) .p2align x | ||
|
|
||
| ENTRY ( __strcmp_sse2_unaligned) | ||
| movl %edi, %eax | ||
| xorl %edx, %edx | ||
| pxor %xmm7, %xmm7 | ||
| orl %esi, %eax | ||
| andl $4095, %eax | ||
| cmpl $4032, %eax | ||
| jg L(cross_page) | ||
| movdqu (%rdi), %xmm1 | ||
| movdqu (%rsi), %xmm0 | ||
| pcmpeqb %xmm1, %xmm0 | ||
| pminub %xmm1, %xmm0 | ||
| pxor %xmm1, %xmm1 | ||
| pcmpeqb %xmm1, %xmm0 | ||
| pmovmskb %xmm0, %eax | ||
| testq %rax, %rax | ||
| je L(next_48_bytes) | ||
| L(return): | ||
| bsfq %rax, %rdx | ||
| movzbl (%rdi, %rdx), %eax | ||
| movzbl (%rsi, %rdx), %edx | ||
| subl %edx, %eax | ||
| ret | ||
|
|
||
| ALIGN (4) | ||
| L(next_48_bytes): | ||
| movdqu 16(%rdi), %xmm6 | ||
| movdqu 16(%rsi), %xmm3 | ||
| movdqu 32(%rdi), %xmm5 | ||
| pcmpeqb %xmm6, %xmm3 | ||
| movdqu 32(%rsi), %xmm2 | ||
| pminub %xmm6, %xmm3 | ||
| pcmpeqb %xmm1, %xmm3 | ||
| movdqu 48(%rdi), %xmm4 | ||
| pcmpeqb %xmm5, %xmm2 | ||
| pmovmskb %xmm3, %edx | ||
| movdqu 48(%rsi), %xmm0 | ||
| pminub %xmm5, %xmm2 | ||
| pcmpeqb %xmm1, %xmm2 | ||
| pcmpeqb %xmm4, %xmm0 | ||
| pmovmskb %xmm2, %eax | ||
| salq $16, %rdx | ||
| pminub %xmm4, %xmm0 | ||
| pcmpeqb %xmm1, %xmm0 | ||
| salq $32, %rax | ||
| orq %rdx, %rax | ||
| pmovmskb %xmm0, %ecx | ||
| movq %rcx, %rdx | ||
| salq $48, %rdx | ||
| orq %rdx, %rax | ||
| jne L(return) | ||
| L(main_loop_header): | ||
| leaq 64(%rdi), %rdx | ||
| movl $4096, %ecx | ||
| pxor %xmm9, %xmm9 | ||
| andq $-64, %rdx | ||
| subq %rdi, %rdx | ||
| leaq (%rdi, %rdx), %rax | ||
| addq %rsi, %rdx | ||
| movq %rdx, %rsi | ||
| andl $4095, %esi | ||
| subq %rsi, %rcx | ||
| shrq $6, %rcx | ||
| movq %rcx, %rsi | ||
| jmp L(loop_start) | ||
|
|
||
| ALIGN (4) | ||
| L(loop): | ||
| addq $64, %rax | ||
| addq $64, %rdx | ||
| L(loop_start): | ||
| testq %rsi, %rsi | ||
| leaq -1(%rsi), %rsi | ||
| je L(loop_cross_page) | ||
| L(back_to_loop): | ||
| movdqu (%rdx), %xmm0 | ||
| movdqu 16(%rdx), %xmm1 | ||
| movdqa (%rax), %xmm2 | ||
| movdqa 16(%rax), %xmm3 | ||
| pcmpeqb %xmm2, %xmm0 | ||
| movdqu 32(%rdx), %xmm5 | ||
| pcmpeqb %xmm3, %xmm1 | ||
| pminub %xmm2, %xmm0 | ||
| movdqu 48(%rdx), %xmm6 | ||
| pminub %xmm3, %xmm1 | ||
| movdqa 32(%rax), %xmm2 | ||
| pminub %xmm1, %xmm0 | ||
| movdqa 48(%rax), %xmm3 | ||
| pcmpeqb %xmm2, %xmm5 | ||
| pcmpeqb %xmm3, %xmm6 | ||
| pminub %xmm2, %xmm5 | ||
| pminub %xmm3, %xmm6 | ||
| pminub %xmm5, %xmm0 | ||
| pminub %xmm6, %xmm0 | ||
| pcmpeqb %xmm7, %xmm0 | ||
| pmovmskb %xmm0, %ecx | ||
| testl %ecx, %ecx | ||
| je L(loop) | ||
| pcmpeqb %xmm7, %xmm5 | ||
| movdqu (%rdx), %xmm0 | ||
| pcmpeqb %xmm7, %xmm1 | ||
| movdqa (%rax), %xmm2 | ||
| pcmpeqb %xmm2, %xmm0 | ||
| pminub %xmm2, %xmm0 | ||
| pcmpeqb %xmm7, %xmm6 | ||
| pcmpeqb %xmm7, %xmm0 | ||
| pmovmskb %xmm1, %ecx | ||
| pmovmskb %xmm5, %r8d | ||
| pmovmskb %xmm0, %edi | ||
| salq $16, %rcx | ||
| salq $32, %r8 | ||
| pmovmskb %xmm6, %esi | ||
| orq %r8, %rcx | ||
| orq %rdi, %rcx | ||
| salq $48, %rsi | ||
| orq %rsi, %rcx | ||
| bsfq %rcx, %rcx | ||
| movzbl (%rax, %rcx), %eax | ||
| movzbl (%rdx, %rcx), %edx | ||
| subl %edx, %eax | ||
| ret | ||
|
|
||
| ALIGN (4) | ||
| L(loop_cross_page): | ||
| xor %r10, %r10 | ||
| movq %rdx, %r9 | ||
| and $63, %r9 | ||
| subq %r9, %r10 | ||
|
|
||
| movdqa (%rdx, %r10), %xmm0 | ||
| movdqa 16(%rdx, %r10), %xmm1 | ||
| movdqu (%rax, %r10), %xmm2 | ||
| movdqu 16(%rax, %r10), %xmm3 | ||
| pcmpeqb %xmm2, %xmm0 | ||
| movdqa 32(%rdx, %r10), %xmm5 | ||
| pcmpeqb %xmm3, %xmm1 | ||
| pminub %xmm2, %xmm0 | ||
| movdqa 48(%rdx, %r10), %xmm6 | ||
| pminub %xmm3, %xmm1 | ||
| movdqu 32(%rax, %r10), %xmm2 | ||
| movdqu 48(%rax, %r10), %xmm3 | ||
| pcmpeqb %xmm2, %xmm5 | ||
| pcmpeqb %xmm3, %xmm6 | ||
| pminub %xmm2, %xmm5 | ||
| pminub %xmm3, %xmm6 | ||
|
|
||
| pcmpeqb %xmm7, %xmm0 | ||
| pcmpeqb %xmm7, %xmm1 | ||
| pcmpeqb %xmm7, %xmm5 | ||
| pcmpeqb %xmm7, %xmm6 | ||
|
|
||
| pmovmskb %xmm1, %ecx | ||
| pmovmskb %xmm5, %r8d | ||
| pmovmskb %xmm0, %edi | ||
| salq $16, %rcx | ||
| salq $32, %r8 | ||
| pmovmskb %xmm6, %esi | ||
| orq %r8, %rdi | ||
| orq %rcx, %rdi | ||
| salq $48, %rsi | ||
| orq %rsi, %rdi | ||
| movq %r9, %rcx | ||
| movq $63, %rsi | ||
| shrq %cl, %rdi | ||
| test %rdi, %rdi | ||
| je L(back_to_loop) | ||
| bsfq %rdi, %rcx | ||
| movzbl (%rax, %rcx), %eax | ||
| movzbl (%rdx, %rcx), %edx | ||
| subl %edx, %eax | ||
| ret | ||
|
|
||
| ALIGN (4) | ||
| L(cross_page_loop): | ||
| cmpb %cl, %al | ||
| jne L(different) | ||
| addq $1, %rdx | ||
| cmpq $64, %rdx | ||
| je L(main_loop_header) | ||
| L(cross_page): | ||
| movzbl (%rdi, %rdx), %eax | ||
| movzbl (%rsi, %rdx), %ecx | ||
| testb %al, %al | ||
| jne L(cross_page_loop) | ||
| xorl %eax, %eax | ||
| L(different): | ||
| subl %ecx, %eax | ||
| ret | ||
| END (__strcmp_sse2_unaligned) |
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