| /* |
| 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) |
| |
