/* 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. */ #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 cfi_rel_offset # define cfi_rel_offset(reg, off) .cfi_rel_offset reg, off #endif #ifndef cfi_restore # define cfi_restore(reg) .cfi_restore reg #endif #ifndef cfi_adjust_cfa_offset # define cfi_adjust_cfa_offset(off) .cfi_adjust_cfa_offset off #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 CFI_PUSH(REG) \ cfi_adjust_cfa_offset (4); \ cfi_rel_offset (REG, 0) #define CFI_POP(REG) \ cfi_adjust_cfa_offset (-4); \ cfi_restore (REG) #define PUSH(REG) pushl REG; CFI_PUSH (REG) #define POP(REG) popl REG; CFI_POP (REG) .section .text.sse2,"ax",@progbits ENTRY (STRLEN) mov 4(%esp), %edx mov %edx, %ecx and $0x3f, %ecx pxor %xmm0, %xmm0 cmp $0x30, %ecx ja L(next) movdqu (%edx), %xmm1 pcmpeqb %xmm1, %xmm0 pmovmskb %xmm0, %ecx test %ecx, %ecx jnz L(exit_less16) mov %edx, %eax and $-16, %eax jmp L(align16_start) L(next): mov %edx, %eax and $-16, %eax PUSH (%edi) pcmpeqb (%eax), %xmm0 mov $-1, %edi sub %eax, %ecx shl %cl, %edi pmovmskb %xmm0, %ecx and %edi, %ecx POP (%edi) jnz L(exit_unaligned) pxor %xmm0, %xmm0 L(align16_start): pxor %xmm1, %xmm1 pxor %xmm2, %xmm2 pxor %xmm3, %xmm3 pcmpeqb 16(%eax), %xmm0 pmovmskb %xmm0, %ecx test %ecx, %ecx jnz L(exit16) pcmpeqb 32(%eax), %xmm1 pmovmskb %xmm1, %ecx test %ecx, %ecx jnz L(exit32) pcmpeqb 48(%eax), %xmm2 pmovmskb %xmm2, %ecx test %ecx, %ecx jnz L(exit48) pcmpeqb 64(%eax), %xmm3 pmovmskb %xmm3, %ecx test %ecx, %ecx jnz L(exit64) pcmpeqb 80(%eax), %xmm0 add $64, %eax pmovmskb %xmm0, %ecx test %ecx, %ecx jnz L(exit16) pcmpeqb 32(%eax), %xmm1 pmovmskb %xmm1, %ecx test %ecx, %ecx jnz L(exit32) pcmpeqb 48(%eax), %xmm2 pmovmskb %xmm2, %ecx test %ecx, %ecx jnz L(exit48) pcmpeqb 64(%eax), %xmm3 pmovmskb %xmm3, %ecx test %ecx, %ecx jnz L(exit64) pcmpeqb 80(%eax), %xmm0 add $64, %eax pmovmskb %xmm0, %ecx test %ecx, %ecx jnz L(exit16) pcmpeqb 32(%eax), %xmm1 pmovmskb %xmm1, %ecx test %ecx, %ecx jnz L(exit32) pcmpeqb 48(%eax), %xmm2 pmovmskb %xmm2, %ecx test %ecx, %ecx jnz L(exit48) pcmpeqb 64(%eax), %xmm3 pmovmskb %xmm3, %ecx test %ecx, %ecx jnz L(exit64) pcmpeqb 80(%eax), %xmm0 add $64, %eax pmovmskb %xmm0, %ecx test %ecx, %ecx jnz L(exit16) pcmpeqb 32(%eax), %xmm1 pmovmskb %xmm1, %ecx test %ecx, %ecx jnz L(exit32) pcmpeqb 48(%eax), %xmm2 pmovmskb %xmm2, %ecx test %ecx, %ecx jnz L(exit48) pcmpeqb 64(%eax), %xmm3 pmovmskb %xmm3, %ecx test %ecx, %ecx jnz L(exit64) test $0x3f, %eax jz L(align64_loop) pcmpeqb 80(%eax), %xmm0 add $80, %eax pmovmskb %xmm0, %ecx test %ecx, %ecx jnz L(exit) test $0x3f, %eax jz L(align64_loop) pcmpeqb 16(%eax), %xmm1 add $16, %eax pmovmskb %xmm1, %ecx test %ecx, %ecx jnz L(exit) test $0x3f, %eax jz L(align64_loop) pcmpeqb 16(%eax), %xmm2 add $16, %eax pmovmskb %xmm2, %ecx test %ecx, %ecx jnz L(exit) test $0x3f, %eax jz L(align64_loop) pcmpeqb 16(%eax), %xmm3 add $16, %eax pmovmskb %xmm3, %ecx test %ecx, %ecx jnz L(exit) add $16, %eax .p2align 4 L(align64_loop): movaps (%eax), %xmm4 pminub 16(%eax), %xmm4 movaps 32(%eax), %xmm5 pminub 48(%eax), %xmm5 add $64, %eax pminub %xmm4, %xmm5 pcmpeqb %xmm0, %xmm5 pmovmskb %xmm5, %ecx test %ecx, %ecx jz L(align64_loop) pcmpeqb -64(%eax), %xmm0 sub $80, %eax pmovmskb %xmm0, %ecx test %ecx, %ecx jnz L(exit16) pcmpeqb 32(%eax), %xmm1 pmovmskb %xmm1, %ecx test %ecx, %ecx jnz L(exit32) pcmpeqb 48(%eax), %xmm2 pmovmskb %xmm2, %ecx test %ecx, %ecx jnz L(exit48) pcmpeqb 64(%eax), %xmm3 pmovmskb %xmm3, %ecx sub %edx, %eax bsf %ecx, %ecx add %ecx, %eax add $64, %eax ret .p2align 4 L(exit): sub %edx, %eax bsf %ecx, %ecx add %ecx, %eax ret L(exit_less16): bsf %ecx, %eax ret .p2align 4 L(exit_unaligned): sub %edx, %eax bsf %ecx, %ecx add %ecx, %eax ret .p2align 4 L(exit16): sub %edx, %eax bsf %ecx, %ecx add %ecx, %eax add $16, %eax ret .p2align 4 L(exit32): sub %edx, %eax bsf %ecx, %ecx add %ecx, %eax add $32, %eax ret .p2align 4 L(exit48): sub %edx, %eax bsf %ecx, %ecx add %ecx, %eax add $48, %eax ret .p2align 4 L(exit64): sub %edx, %eax bsf %ecx, %ecx add %ecx, %eax add $64, %eax ret END (STRLEN)