| /* strlen with SSE2 |
| Copyright (C) 2010-2014 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/>. */ |
| |
| /* for strlen only SHARED version is optimized, for strcat, strncat, strnlen both STATIC and SHARED are optimized */ |
| |
| #if (defined USE_AS_STRNLEN || defined USE_AS_STRCAT || defined SHARED) && !defined NOT_IN_libc |
| |
| # ifndef USE_AS_STRCAT |
| |
| # include <sysdep.h> |
| # define PARMS 4 |
| # define STR PARMS |
| # define RETURN ret |
| |
| # ifdef USE_AS_STRNLEN |
| # define LEN PARMS + 8 |
| # 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) |
| # undef RETURN |
| # define RETURN POP (%edi); CFI_PUSH(%edi); ret |
| # endif |
| |
| # ifndef STRLEN |
| # define STRLEN __strlen_sse2 |
| # endif |
| |
| atom_text_section |
| ENTRY (STRLEN) |
| mov STR(%esp), %edx |
| # ifdef USE_AS_STRNLEN |
| PUSH (%edi) |
| movl LEN(%esp), %edi |
| sub $4, %edi |
| jbe L(len_less4_prolog) |
| # endif |
| # endif |
| xor %eax, %eax |
| cmpb $0, (%edx) |
| jz L(exit_tail0) |
| cmpb $0, 1(%edx) |
| jz L(exit_tail1) |
| cmpb $0, 2(%edx) |
| jz L(exit_tail2) |
| cmpb $0, 3(%edx) |
| jz L(exit_tail3) |
| |
| # ifdef USE_AS_STRNLEN |
| sub $4, %edi |
| jbe L(len_less8_prolog) |
| # endif |
| |
| cmpb $0, 4(%edx) |
| jz L(exit_tail4) |
| cmpb $0, 5(%edx) |
| jz L(exit_tail5) |
| cmpb $0, 6(%edx) |
| jz L(exit_tail6) |
| cmpb $0, 7(%edx) |
| jz L(exit_tail7) |
| |
| # ifdef USE_AS_STRNLEN |
| sub $4, %edi |
| jbe L(len_less12_prolog) |
| # endif |
| |
| cmpb $0, 8(%edx) |
| jz L(exit_tail8) |
| cmpb $0, 9(%edx) |
| jz L(exit_tail9) |
| cmpb $0, 10(%edx) |
| jz L(exit_tail10) |
| cmpb $0, 11(%edx) |
| jz L(exit_tail11) |
| |
| # ifdef USE_AS_STRNLEN |
| sub $4, %edi |
| jbe L(len_less16_prolog) |
| # endif |
| |
| cmpb $0, 12(%edx) |
| jz L(exit_tail12) |
| cmpb $0, 13(%edx) |
| jz L(exit_tail13) |
| cmpb $0, 14(%edx) |
| jz L(exit_tail14) |
| cmpb $0, 15(%edx) |
| jz L(exit_tail15) |
| |
| pxor %xmm0, %xmm0 |
| lea 16(%edx), %eax |
| mov %eax, %ecx |
| and $-16, %eax |
| |
| # ifdef USE_AS_STRNLEN |
| and $15, %edx |
| add %edx, %edi |
| sub $64, %edi |
| jbe L(len_less64) |
| # endif |
| |
| pcmpeqb (%eax), %xmm0 |
| pmovmskb %xmm0, %edx |
| pxor %xmm1, %xmm1 |
| test %edx, %edx |
| lea 16(%eax), %eax |
| jnz L(exit) |
| |
| pcmpeqb (%eax), %xmm1 |
| pmovmskb %xmm1, %edx |
| pxor %xmm2, %xmm2 |
| test %edx, %edx |
| lea 16(%eax), %eax |
| jnz L(exit) |
| |
| pcmpeqb (%eax), %xmm2 |
| pmovmskb %xmm2, %edx |
| pxor %xmm3, %xmm3 |
| test %edx, %edx |
| lea 16(%eax), %eax |
| jnz L(exit) |
| |
| pcmpeqb (%eax), %xmm3 |
| pmovmskb %xmm3, %edx |
| test %edx, %edx |
| lea 16(%eax), %eax |
| jnz L(exit) |
| |
| # ifdef USE_AS_STRNLEN |
| sub $64, %edi |
| jbe L(len_less64) |
| # endif |
| |
| pcmpeqb (%eax), %xmm0 |
| pmovmskb %xmm0, %edx |
| test %edx, %edx |
| lea 16(%eax), %eax |
| jnz L(exit) |
| |
| pcmpeqb (%eax), %xmm1 |
| pmovmskb %xmm1, %edx |
| test %edx, %edx |
| lea 16(%eax), %eax |
| jnz L(exit) |
| |
| pcmpeqb (%eax), %xmm2 |
| pmovmskb %xmm2, %edx |
| test %edx, %edx |
| lea 16(%eax), %eax |
| jnz L(exit) |
| |
| pcmpeqb (%eax), %xmm3 |
| pmovmskb %xmm3, %edx |
| test %edx, %edx |
| lea 16(%eax), %eax |
| jnz L(exit) |
| |
| # ifdef USE_AS_STRNLEN |
| sub $64, %edi |
| jbe L(len_less64) |
| # endif |
| |
| pcmpeqb (%eax), %xmm0 |
| pmovmskb %xmm0, %edx |
| test %edx, %edx |
| lea 16(%eax), %eax |
| jnz L(exit) |
| |
| pcmpeqb (%eax), %xmm1 |
| pmovmskb %xmm1, %edx |
| test %edx, %edx |
| lea 16(%eax), %eax |
| jnz L(exit) |
| |
| pcmpeqb (%eax), %xmm2 |
| pmovmskb %xmm2, %edx |
| test %edx, %edx |
| lea 16(%eax), %eax |
| jnz L(exit) |
| |
| pcmpeqb (%eax), %xmm3 |
| pmovmskb %xmm3, %edx |
| test %edx, %edx |
| lea 16(%eax), %eax |
| jnz L(exit) |
| |
| # ifdef USE_AS_STRNLEN |
| sub $64, %edi |
| jbe L(len_less64) |
| # endif |
| |
| pcmpeqb (%eax), %xmm0 |
| pmovmskb %xmm0, %edx |
| test %edx, %edx |
| lea 16(%eax), %eax |
| jnz L(exit) |
| |
| pcmpeqb (%eax), %xmm1 |
| pmovmskb %xmm1, %edx |
| test %edx, %edx |
| lea 16(%eax), %eax |
| jnz L(exit) |
| |
| pcmpeqb (%eax), %xmm2 |
| pmovmskb %xmm2, %edx |
| test %edx, %edx |
| lea 16(%eax), %eax |
| jnz L(exit) |
| |
| pcmpeqb (%eax), %xmm3 |
| pmovmskb %xmm3, %edx |
| test %edx, %edx |
| lea 16(%eax), %eax |
| jnz L(exit) |
| |
| # ifdef USE_AS_STRNLEN |
| mov %eax, %edx |
| and $63, %edx |
| add %edx, %edi |
| # endif |
| |
| and $-0x40, %eax |
| |
| .p2align 4 |
| L(aligned_64_loop): |
| # ifdef USE_AS_STRNLEN |
| sub $64, %edi |
| jbe L(len_less64) |
| # endif |
| movaps (%eax), %xmm0 |
| movaps 16(%eax), %xmm1 |
| movaps 32(%eax), %xmm2 |
| movaps 48(%eax), %xmm6 |
| pminub %xmm1, %xmm0 |
| pminub %xmm6, %xmm2 |
| pminub %xmm0, %xmm2 |
| pcmpeqb %xmm3, %xmm2 |
| pmovmskb %xmm2, %edx |
| test %edx, %edx |
| lea 64(%eax), %eax |
| jz L(aligned_64_loop) |
| |
| pcmpeqb -64(%eax), %xmm3 |
| pmovmskb %xmm3, %edx |
| test %edx, %edx |
| lea 48(%ecx), %ecx |
| jnz L(exit) |
| |
| pcmpeqb %xmm1, %xmm3 |
| pmovmskb %xmm3, %edx |
| test %edx, %edx |
| lea -16(%ecx), %ecx |
| jnz L(exit) |
| |
| pcmpeqb -32(%eax), %xmm3 |
| pmovmskb %xmm3, %edx |
| test %edx, %edx |
| lea -16(%ecx), %ecx |
| jnz L(exit) |
| |
| pcmpeqb %xmm6, %xmm3 |
| pmovmskb %xmm3, %edx |
| lea -16(%ecx), %ecx |
| L(exit): |
| sub %ecx, %eax |
| test %dl, %dl |
| jz L(exit_high) |
| |
| mov %dl, %cl |
| and $15, %cl |
| jz L(exit_8) |
| test $0x01, %dl |
| jnz L(exit_tail0) |
| test $0x02, %dl |
| jnz L(exit_tail1) |
| test $0x04, %dl |
| jnz L(exit_tail2) |
| add $3, %eax |
| RETURN |
| |
| .p2align 4 |
| L(exit_8): |
| test $0x10, %dl |
| jnz L(exit_tail4) |
| test $0x20, %dl |
| jnz L(exit_tail5) |
| test $0x40, %dl |
| jnz L(exit_tail6) |
| add $7, %eax |
| RETURN |
| |
| .p2align 4 |
| L(exit_high): |
| mov %dh, %ch |
| and $15, %ch |
| jz L(exit_high_8) |
| test $0x01, %dh |
| jnz L(exit_tail8) |
| test $0x02, %dh |
| jnz L(exit_tail9) |
| test $0x04, %dh |
| jnz L(exit_tail10) |
| add $11, %eax |
| RETURN |
| |
| .p2align 4 |
| L(exit_high_8): |
| test $0x10, %dh |
| jnz L(exit_tail12) |
| test $0x20, %dh |
| jnz L(exit_tail13) |
| test $0x40, %dh |
| jnz L(exit_tail14) |
| add $15, %eax |
| L(exit_tail0): |
| RETURN |
| |
| # ifdef USE_AS_STRNLEN |
| |
| .p2align 4 |
| L(len_less64): |
| pxor %xmm0, %xmm0 |
| add $64, %edi |
| |
| pcmpeqb (%eax), %xmm0 |
| pmovmskb %xmm0, %edx |
| pxor %xmm1, %xmm1 |
| lea 16(%eax), %eax |
| test %edx, %edx |
| jnz L(strnlen_exit) |
| |
| sub $16, %edi |
| jbe L(return_start_len) |
| |
| pcmpeqb (%eax), %xmm1 |
| pmovmskb %xmm1, %edx |
| lea 16(%eax), %eax |
| test %edx, %edx |
| jnz L(strnlen_exit) |
| |
| sub $16, %edi |
| jbe L(return_start_len) |
| |
| pcmpeqb (%eax), %xmm0 |
| pmovmskb %xmm0, %edx |
| lea 16(%eax), %eax |
| test %edx, %edx |
| jnz L(strnlen_exit) |
| |
| sub $16, %edi |
| jbe L(return_start_len) |
| |
| pcmpeqb (%eax), %xmm1 |
| pmovmskb %xmm1, %edx |
| lea 16(%eax), %eax |
| test %edx, %edx |
| jnz L(strnlen_exit) |
| |
| movl LEN(%esp), %eax |
| RETURN |
| |
| .p2align 4 |
| L(strnlen_exit): |
| sub %ecx, %eax |
| |
| test %dl, %dl |
| jz L(strnlen_exit_high) |
| mov %dl, %cl |
| and $15, %cl |
| jz L(strnlen_exit_8) |
| test $0x01, %dl |
| jnz L(exit_tail0) |
| test $0x02, %dl |
| jnz L(strnlen_exit_tail1) |
| test $0x04, %dl |
| jnz L(strnlen_exit_tail2) |
| sub $4, %edi |
| jb L(return_start_len) |
| lea 3(%eax), %eax |
| RETURN |
| |
| .p2align 4 |
| L(strnlen_exit_8): |
| test $0x10, %dl |
| jnz L(strnlen_exit_tail4) |
| test $0x20, %dl |
| jnz L(strnlen_exit_tail5) |
| test $0x40, %dl |
| jnz L(strnlen_exit_tail6) |
| sub $8, %edi |
| jb L(return_start_len) |
| lea 7(%eax), %eax |
| RETURN |
| |
| .p2align 4 |
| L(strnlen_exit_high): |
| mov %dh, %ch |
| and $15, %ch |
| jz L(strnlen_exit_high_8) |
| test $0x01, %dh |
| jnz L(strnlen_exit_tail8) |
| test $0x02, %dh |
| jnz L(strnlen_exit_tail9) |
| test $0x04, %dh |
| jnz L(strnlen_exit_tail10) |
| sub $12, %edi |
| jb L(return_start_len) |
| lea 11(%eax), %eax |
| RETURN |
| |
| .p2align 4 |
| L(strnlen_exit_high_8): |
| test $0x10, %dh |
| jnz L(strnlen_exit_tail12) |
| test $0x20, %dh |
| jnz L(strnlen_exit_tail13) |
| test $0x40, %dh |
| jnz L(strnlen_exit_tail14) |
| sub $16, %edi |
| jb L(return_start_len) |
| lea 15(%eax), %eax |
| RETURN |
| |
| .p2align 4 |
| L(strnlen_exit_tail1): |
| sub $2, %edi |
| jb L(return_start_len) |
| lea 1(%eax), %eax |
| RETURN |
| |
| .p2align 4 |
| L(strnlen_exit_tail2): |
| sub $3, %edi |
| jb L(return_start_len) |
| lea 2(%eax), %eax |
| RETURN |
| |
| .p2align 4 |
| L(strnlen_exit_tail4): |
| sub $5, %edi |
| jb L(return_start_len) |
| lea 4(%eax), %eax |
| RETURN |
| |
| .p2align 4 |
| L(strnlen_exit_tail5): |
| sub $6, %edi |
| jb L(return_start_len) |
| lea 5(%eax), %eax |
| RETURN |
| |
| .p2align 4 |
| L(strnlen_exit_tail6): |
| sub $7, %edi |
| jb L(return_start_len) |
| lea 6(%eax), %eax |
| RETURN |
| |
| .p2align 4 |
| L(strnlen_exit_tail8): |
| sub $9, %edi |
| jb L(return_start_len) |
| lea 8(%eax), %eax |
| RETURN |
| |
| .p2align 4 |
| L(strnlen_exit_tail9): |
| sub $10, %edi |
| jb L(return_start_len) |
| lea 9(%eax), %eax |
| RETURN |
| |
| .p2align 4 |
| L(strnlen_exit_tail10): |
| sub $11, %edi |
| jb L(return_start_len) |
| lea 10(%eax), %eax |
| RETURN |
| |
| .p2align 4 |
| L(strnlen_exit_tail12): |
| sub $13, %edi |
| jb L(return_start_len) |
| lea 12(%eax), %eax |
| RETURN |
| |
| .p2align 4 |
| L(strnlen_exit_tail13): |
| sub $14, %edi |
| jb L(return_start_len) |
| lea 13(%eax), %eax |
| RETURN |
| |
| .p2align 4 |
| L(strnlen_exit_tail14): |
| sub $15, %edi |
| jb L(return_start_len) |
| lea 14(%eax), %eax |
| RETURN |
| |
| .p2align 4 |
| L(return_start_len): |
| movl LEN(%esp), %eax |
| RETURN |
| |
| /* for prolog only */ |
| |
| .p2align 4 |
| L(len_less4_prolog): |
| xor %eax, %eax |
| |
| add $4, %edi |
| jz L(exit_tail0) |
| |
| cmpb $0, (%edx) |
| jz L(exit_tail0) |
| cmp $1, %edi |
| je L(exit_tail1) |
| |
| cmpb $0, 1(%edx) |
| jz L(exit_tail1) |
| cmp $2, %edi |
| je L(exit_tail2) |
| |
| cmpb $0, 2(%edx) |
| jz L(exit_tail2) |
| cmp $3, %edi |
| je L(exit_tail3) |
| |
| cmpb $0, 3(%edx) |
| jz L(exit_tail3) |
| mov $4, %eax |
| RETURN |
| |
| .p2align 4 |
| L(len_less8_prolog): |
| add $4, %edi |
| |
| cmpb $0, 4(%edx) |
| jz L(exit_tail4) |
| cmp $1, %edi |
| je L(exit_tail5) |
| |
| cmpb $0, 5(%edx) |
| jz L(exit_tail5) |
| cmp $2, %edi |
| je L(exit_tail6) |
| |
| cmpb $0, 6(%edx) |
| jz L(exit_tail6) |
| cmp $3, %edi |
| je L(exit_tail7) |
| |
| cmpb $0, 7(%edx) |
| jz L(exit_tail7) |
| mov $8, %eax |
| RETURN |
| |
| |
| .p2align 4 |
| L(len_less12_prolog): |
| add $4, %edi |
| |
| cmpb $0, 8(%edx) |
| jz L(exit_tail8) |
| cmp $1, %edi |
| je L(exit_tail9) |
| |
| cmpb $0, 9(%edx) |
| jz L(exit_tail9) |
| cmp $2, %edi |
| je L(exit_tail10) |
| |
| cmpb $0, 10(%edx) |
| jz L(exit_tail10) |
| cmp $3, %edi |
| je L(exit_tail11) |
| |
| cmpb $0, 11(%edx) |
| jz L(exit_tail11) |
| mov $12, %eax |
| RETURN |
| |
| .p2align 4 |
| L(len_less16_prolog): |
| add $4, %edi |
| |
| cmpb $0, 12(%edx) |
| jz L(exit_tail12) |
| cmp $1, %edi |
| je L(exit_tail13) |
| |
| cmpb $0, 13(%edx) |
| jz L(exit_tail13) |
| cmp $2, %edi |
| je L(exit_tail14) |
| |
| cmpb $0, 14(%edx) |
| jz L(exit_tail14) |
| cmp $3, %edi |
| je L(exit_tail15) |
| |
| cmpb $0, 15(%edx) |
| jz L(exit_tail15) |
| mov $16, %eax |
| RETURN |
| # endif |
| |
| .p2align 4 |
| L(exit_tail1): |
| add $1, %eax |
| RETURN |
| |
| L(exit_tail2): |
| add $2, %eax |
| RETURN |
| |
| L(exit_tail3): |
| add $3, %eax |
| RETURN |
| |
| L(exit_tail4): |
| add $4, %eax |
| RETURN |
| |
| L(exit_tail5): |
| add $5, %eax |
| RETURN |
| |
| L(exit_tail6): |
| add $6, %eax |
| RETURN |
| |
| L(exit_tail7): |
| add $7, %eax |
| RETURN |
| |
| L(exit_tail8): |
| add $8, %eax |
| RETURN |
| |
| L(exit_tail9): |
| add $9, %eax |
| RETURN |
| |
| L(exit_tail10): |
| add $10, %eax |
| RETURN |
| |
| L(exit_tail11): |
| add $11, %eax |
| RETURN |
| |
| L(exit_tail12): |
| add $12, %eax |
| RETURN |
| |
| L(exit_tail13): |
| add $13, %eax |
| RETURN |
| |
| L(exit_tail14): |
| add $14, %eax |
| RETURN |
| |
| L(exit_tail15): |
| add $15, %eax |
| # ifndef USE_AS_STRCAT |
| RETURN |
| END (STRLEN) |
| # endif |
| #endif |
