/********************************************************************************* * libs/libc/machine/x86_64/gnu/arch_strlen.S * * Copyright (c) 2014, Intel Corporation * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * * Redistributions of source code must retain the above copyright notice, * * this list of conditions and the following disclaimer. * * * Redistributions in binary form must reproduce the above copyright notice, * * this list of conditions and the following disclaimer in the documentation * * and/or other materials provided with the distribution. * * * Neither the name of Intel Corporation nor the names of its contributors * * may be used to endorse or promote products derived from this software * * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * *********************************************************************************/ /********************************************************************************* * Pre-processor Definitions *********************************************************************************/ #ifndef USE_AS_STRCAT #ifndef STRLEN # define STRLEN strlen #endif #ifndef L # define L(label) .L##label #endif #ifndef cfi_startproc # define cfi_startproc .cfi_startproc #endif #ifndef cfi_endproc # define cfi_endproc .cfi_endproc #endif #ifndef ENTRY # define ENTRY(name) \ .type name, @function; \ .globl name; \ .p2align 4; \ name: \ cfi_startproc #endif #ifndef END # define END(name) \ cfi_endproc; \ .size name, .-name #endif #define RETURN ret /********************************************************************************* * Public Functions *********************************************************************************/ .section .text.sse2,"ax",@progbits ENTRY (STRLEN) /* end ifndef USE_AS_STRCAT */ #endif xor %rax, %rax mov %edi, %ecx and $0x3f, %ecx pxor %xmm0, %xmm0 cmp $0x30, %ecx ja L(next) movdqu (%rdi), %xmm1 pcmpeqb %xmm1, %xmm0 pmovmskb %xmm0, %edx test %edx, %edx jnz L(exit_less16) mov %rdi, %rax and $-16, %rax jmp L(align16_start) L(next): mov %rdi, %rax and $-16, %rax pcmpeqb (%rax), %xmm0 mov $-1, %r10d sub %rax, %rcx shl %cl, %r10d pmovmskb %xmm0, %edx and %r10d, %edx jnz L(exit) L(align16_start): pxor %xmm0, %xmm0 pxor %xmm1, %xmm1 pxor %xmm2, %xmm2 pxor %xmm3, %xmm3 pcmpeqb 16(%rax), %xmm0 pmovmskb %xmm0, %edx test %edx, %edx jnz L(exit16) pcmpeqb 32(%rax), %xmm1 pmovmskb %xmm1, %edx test %edx, %edx jnz L(exit32) pcmpeqb 48(%rax), %xmm2 pmovmskb %xmm2, %edx test %edx, %edx jnz L(exit48) pcmpeqb 64(%rax), %xmm3 pmovmskb %xmm3, %edx test %edx, %edx jnz L(exit64) pcmpeqb 80(%rax), %xmm0 add $64, %rax pmovmskb %xmm0, %edx test %edx, %edx jnz L(exit16) pcmpeqb 32(%rax), %xmm1 pmovmskb %xmm1, %edx test %edx, %edx jnz L(exit32) pcmpeqb 48(%rax), %xmm2 pmovmskb %xmm2, %edx test %edx, %edx jnz L(exit48) pcmpeqb 64(%rax), %xmm3 pmovmskb %xmm3, %edx test %edx, %edx jnz L(exit64) pcmpeqb 80(%rax), %xmm0 add $64, %rax pmovmskb %xmm0, %edx test %edx, %edx jnz L(exit16) pcmpeqb 32(%rax), %xmm1 pmovmskb %xmm1, %edx test %edx, %edx jnz L(exit32) pcmpeqb 48(%rax), %xmm2 pmovmskb %xmm2, %edx test %edx, %edx jnz L(exit48) pcmpeqb 64(%rax), %xmm3 pmovmskb %xmm3, %edx test %edx, %edx jnz L(exit64) pcmpeqb 80(%rax), %xmm0 add $64, %rax pmovmskb %xmm0, %edx test %edx, %edx jnz L(exit16) pcmpeqb 32(%rax), %xmm1 pmovmskb %xmm1, %edx test %edx, %edx jnz L(exit32) pcmpeqb 48(%rax), %xmm2 pmovmskb %xmm2, %edx test %edx, %edx jnz L(exit48) pcmpeqb 64(%rax), %xmm3 pmovmskb %xmm3, %edx test %edx, %edx jnz L(exit64) test $0x3f, %rax jz L(align64_loop) pcmpeqb 80(%rax), %xmm0 add $80, %rax pmovmskb %xmm0, %edx test %edx, %edx jnz L(exit) test $0x3f, %rax jz L(align64_loop) pcmpeqb 16(%rax), %xmm1 add $16, %rax pmovmskb %xmm1, %edx test %edx, %edx jnz L(exit) test $0x3f, %rax jz L(align64_loop) pcmpeqb 16(%rax), %xmm2 add $16, %rax pmovmskb %xmm2, %edx test %edx, %edx jnz L(exit) test $0x3f, %rax jz L(align64_loop) pcmpeqb 16(%rax), %xmm3 add $16, %rax pmovmskb %xmm3, %edx test %edx, %edx jnz L(exit) add $16, %rax .p2align 4 L(align64_loop): movaps (%rax), %xmm4 pminub 16(%rax), %xmm4 movaps 32(%rax), %xmm5 pminub 48(%rax), %xmm5 add $64, %rax pminub %xmm4, %xmm5 pcmpeqb %xmm0, %xmm5 pmovmskb %xmm5, %edx test %edx, %edx jz L(align64_loop) pcmpeqb -64(%rax), %xmm0 sub $80, %rax pmovmskb %xmm0, %edx test %edx, %edx jnz L(exit16) pcmpeqb 32(%rax), %xmm1 pmovmskb %xmm1, %edx test %edx, %edx jnz L(exit32) pcmpeqb 48(%rax), %xmm2 pmovmskb %xmm2, %edx test %edx, %edx jnz L(exit48) pcmpeqb 64(%rax), %xmm3 pmovmskb %xmm3, %edx sub %rdi, %rax bsf %rdx, %rdx add %rdx, %rax add $64, %rax RETURN .p2align 4 L(exit): sub %rdi, %rax L(exit_less16): bsf %rdx, %rdx add %rdx, %rax RETURN .p2align 4 L(exit16): sub %rdi, %rax bsf %rdx, %rdx add %rdx, %rax add $16, %rax RETURN .p2align 4 L(exit32): sub %rdi, %rax bsf %rdx, %rdx add %rdx, %rax add $32, %rax RETURN .p2align 4 L(exit48): sub %rdi, %rax bsf %rdx, %rdx add %rdx, %rax add $48, %rax RETURN .p2align 4 L(exit64): sub %rdi, %rax bsf %rdx, %rdx add %rdx, %rax add $64, %rax #ifndef USE_AS_STRCAT RETURN END (STRLEN) #endif