diff options
Diffstat (limited to 'sysdeps/x86_64/memchr.S')
| -rw-r--r-- | sysdeps/x86_64/memchr.S | 315 |
1 files changed, 0 insertions, 315 deletions
diff --git a/sysdeps/x86_64/memchr.S b/sysdeps/x86_64/memchr.S deleted file mode 100644 index d3be012424..0000000000 --- a/sysdeps/x86_64/memchr.S +++ /dev/null @@ -1,315 +0,0 @@ -/* Copyright (C) 2011-2017 Free Software Foundation, Inc. - Contributed by Intel Corporation. - 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> - -/* fast SSE2 version with using pmaxub and 64 byte loop */ - - .text -ENTRY(memchr) - movd %esi, %xmm1 - mov %edi, %ecx - - punpcklbw %xmm1, %xmm1 - test %rdx, %rdx - jz L(return_null) - punpcklbw %xmm1, %xmm1 - - and $63, %ecx - pshufd $0, %xmm1, %xmm1 - - cmp $48, %ecx - ja L(crosscache) - - movdqu (%rdi), %xmm0 - pcmpeqb %xmm1, %xmm0 - pmovmskb %xmm0, %eax - test %eax, %eax - - jnz L(matches_1) - sub $16, %rdx - jbe L(return_null) - add $16, %rdi - and $15, %ecx - and $-16, %rdi - add %rcx, %rdx - sub $64, %rdx - jbe L(exit_loop) - jmp L(loop_prolog) - - .p2align 4 -L(crosscache): - and $15, %ecx - and $-16, %rdi - movdqa (%rdi), %xmm0 - - pcmpeqb %xmm1, %xmm0 -/* Check if there is a match. */ - pmovmskb %xmm0, %eax -/* Remove the leading bytes. */ - sar %cl, %eax - test %eax, %eax - je L(unaligned_no_match) -/* Check which byte is a match. */ - bsf %eax, %eax - - sub %rax, %rdx - jbe L(return_null) - add %rdi, %rax - add %rcx, %rax - ret - - .p2align 4 -L(unaligned_no_match): - /* "rcx" is less than 16. Calculate "rdx + rcx - 16" by using - "rdx - (16 - rcx)" instead of "(rdx + rcx) - 16" to void - possible addition overflow. */ - neg %rcx - add $16, %rcx - sub %rcx, %rdx - jbe L(return_null) - add $16, %rdi - sub $64, %rdx - jbe L(exit_loop) - - .p2align 4 -L(loop_prolog): - movdqa (%rdi), %xmm0 - pcmpeqb %xmm1, %xmm0 - pmovmskb %xmm0, %eax - test %eax, %eax - jnz L(matches) - - movdqa 16(%rdi), %xmm2 - pcmpeqb %xmm1, %xmm2 - pmovmskb %xmm2, %eax - test %eax, %eax - jnz L(matches16) - - movdqa 32(%rdi), %xmm3 - pcmpeqb %xmm1, %xmm3 - pmovmskb %xmm3, %eax - test %eax, %eax - jnz L(matches32) - - movdqa 48(%rdi), %xmm4 - pcmpeqb %xmm1, %xmm4 - add $64, %rdi - pmovmskb %xmm4, %eax - test %eax, %eax - jnz L(matches0) - - test $0x3f, %rdi - jz L(align64_loop) - - sub $64, %rdx - jbe L(exit_loop) - - movdqa (%rdi), %xmm0 - pcmpeqb %xmm1, %xmm0 - pmovmskb %xmm0, %eax - test %eax, %eax - jnz L(matches) - - movdqa 16(%rdi), %xmm2 - pcmpeqb %xmm1, %xmm2 - pmovmskb %xmm2, %eax - test %eax, %eax - jnz L(matches16) - - movdqa 32(%rdi), %xmm3 - pcmpeqb %xmm1, %xmm3 - pmovmskb %xmm3, %eax - test %eax, %eax - jnz L(matches32) - - movdqa 48(%rdi), %xmm3 - pcmpeqb %xmm1, %xmm3 - pmovmskb %xmm3, %eax - - add $64, %rdi - test %eax, %eax - jnz L(matches0) - - mov %rdi, %rcx - and $-64, %rdi - and $63, %ecx - add %rcx, %rdx - - .p2align 4 -L(align64_loop): - sub $64, %rdx - jbe L(exit_loop) - movdqa (%rdi), %xmm0 - movdqa 16(%rdi), %xmm2 - movdqa 32(%rdi), %xmm3 - movdqa 48(%rdi), %xmm4 - - pcmpeqb %xmm1, %xmm0 - pcmpeqb %xmm1, %xmm2 - pcmpeqb %xmm1, %xmm3 - pcmpeqb %xmm1, %xmm4 - - pmaxub %xmm0, %xmm3 - pmaxub %xmm2, %xmm4 - pmaxub %xmm3, %xmm4 - pmovmskb %xmm4, %eax - - add $64, %rdi - - test %eax, %eax - jz L(align64_loop) - - sub $64, %rdi - - pmovmskb %xmm0, %eax - test %eax, %eax - jnz L(matches) - - pmovmskb %xmm2, %eax - test %eax, %eax - jnz L(matches16) - - movdqa 32(%rdi), %xmm3 - pcmpeqb %xmm1, %xmm3 - - pcmpeqb 48(%rdi), %xmm1 - pmovmskb %xmm3, %eax - test %eax, %eax - jnz L(matches32) - - pmovmskb %xmm1, %eax - bsf %eax, %eax - lea 48(%rdi, %rax), %rax - ret - - .p2align 4 -L(exit_loop): - add $32, %edx - jle L(exit_loop_32) - - movdqa (%rdi), %xmm0 - pcmpeqb %xmm1, %xmm0 - pmovmskb %xmm0, %eax - test %eax, %eax - jnz L(matches) - - movdqa 16(%rdi), %xmm2 - pcmpeqb %xmm1, %xmm2 - pmovmskb %xmm2, %eax - test %eax, %eax - jnz L(matches16) - - movdqa 32(%rdi), %xmm3 - pcmpeqb %xmm1, %xmm3 - pmovmskb %xmm3, %eax - test %eax, %eax - jnz L(matches32_1) - sub $16, %edx - jle L(return_null) - - pcmpeqb 48(%rdi), %xmm1 - pmovmskb %xmm1, %eax - test %eax, %eax - jnz L(matches48_1) - xor %eax, %eax - ret - - .p2align 4 -L(exit_loop_32): - add $32, %edx - movdqa (%rdi), %xmm0 - pcmpeqb %xmm1, %xmm0 - pmovmskb %xmm0, %eax - test %eax, %eax - jnz L(matches_1) - sub $16, %edx - jbe L(return_null) - - pcmpeqb 16(%rdi), %xmm1 - pmovmskb %xmm1, %eax - test %eax, %eax - jnz L(matches16_1) - xor %eax, %eax - ret - - .p2align 4 -L(matches0): - bsf %eax, %eax - lea -16(%rax, %rdi), %rax - ret - - .p2align 4 -L(matches): - bsf %eax, %eax - add %rdi, %rax - ret - - .p2align 4 -L(matches16): - bsf %eax, %eax - lea 16(%rax, %rdi), %rax - ret - - .p2align 4 -L(matches32): - bsf %eax, %eax - lea 32(%rax, %rdi), %rax - ret - - .p2align 4 -L(matches_1): - bsf %eax, %eax - sub %rax, %rdx - jbe L(return_null) - add %rdi, %rax - ret - - .p2align 4 -L(matches16_1): - bsf %eax, %eax - sub %rax, %rdx - jbe L(return_null) - lea 16(%rdi, %rax), %rax - ret - - .p2align 4 -L(matches32_1): - bsf %eax, %eax - sub %rax, %rdx - jbe L(return_null) - lea 32(%rdi, %rax), %rax - ret - - .p2align 4 -L(matches48_1): - bsf %eax, %eax - sub %rax, %rdx - jbe L(return_null) - lea 48(%rdi, %rax), %rax - ret - - .p2align 4 -L(return_null): - xor %eax, %eax - ret -END(memchr) - -strong_alias (memchr, __memchr) - -libc_hidden_builtin_def(memchr) |