| /* |
| Copyright (c) 2011, 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 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) |
| |
| #define PARMS 4 |
| #define STR1 PARMS |
| #define STR2 STR1+4 |
| #define LEN STR2+4 |
| |
| .text |
| ENTRY (memrchr) |
| mov STR1(%esp), %ecx |
| movd STR2(%esp), %xmm1 |
| mov LEN(%esp), %edx |
| |
| test %edx, %edx |
| jz L(return_null) |
| sub $16, %edx |
| jbe L(length_less16) |
| |
| punpcklbw %xmm1, %xmm1 |
| add %edx, %ecx |
| punpcklbw %xmm1, %xmm1 |
| |
| movdqu (%ecx), %xmm0 |
| pshufd $0, %xmm1, %xmm1 |
| pcmpeqb %xmm1, %xmm0 |
| |
| pmovmskb %xmm0, %eax |
| test %eax, %eax |
| jnz L(exit_dispatch) |
| |
| sub $64, %ecx |
| mov %ecx, %eax |
| and $15, %eax |
| jz L(loop_prolog) |
| |
| add $16, %ecx |
| add $16, %edx |
| and $-16, %ecx |
| sub %eax, %edx |
| |
| .p2align 4 |
| /* Loop start on aligned string. */ |
| L(loop_prolog): |
| sub $64, %edx |
| jbe L(exit_loop) |
| |
| movdqa 48(%ecx), %xmm0 |
| pcmpeqb %xmm1, %xmm0 |
| pmovmskb %xmm0, %eax |
| test %eax, %eax |
| jnz L(matches48) |
| |
| movdqa 32(%ecx), %xmm2 |
| pcmpeqb %xmm1, %xmm2 |
| pmovmskb %xmm2, %eax |
| test %eax, %eax |
| jnz L(matches32) |
| |
| movdqa 16(%ecx), %xmm3 |
| pcmpeqb %xmm1, %xmm3 |
| pmovmskb %xmm3, %eax |
| test %eax, %eax |
| jnz L(matches16) |
| |
| movdqa (%ecx), %xmm4 |
| pcmpeqb %xmm1, %xmm4 |
| pmovmskb %xmm4, %eax |
| test %eax, %eax |
| jnz L(exit_dispatch) |
| |
| sub $64, %ecx |
| sub $64, %edx |
| jbe L(exit_loop) |
| |
| movdqa 48(%ecx), %xmm0 |
| pcmpeqb %xmm1, %xmm0 |
| pmovmskb %xmm0, %eax |
| test %eax, %eax |
| jnz L(matches48) |
| |
| movdqa 32(%ecx), %xmm2 |
| pcmpeqb %xmm1, %xmm2 |
| pmovmskb %xmm2, %eax |
| test %eax, %eax |
| jnz L(matches32) |
| |
| movdqa 16(%ecx), %xmm3 |
| pcmpeqb %xmm1, %xmm3 |
| pmovmskb %xmm3, %eax |
| test %eax, %eax |
| jnz L(matches16) |
| |
| movdqa (%ecx), %xmm3 |
| pcmpeqb %xmm1, %xmm3 |
| pmovmskb %xmm3, %eax |
| test %eax, %eax |
| jnz L(exit_dispatch) |
| |
| mov %ecx, %eax |
| and $63, %eax |
| test %eax, %eax |
| jz L(align64_loop) |
| |
| add $64, %ecx |
| add $64, %edx |
| and $-64, %ecx |
| sub %eax, %edx |
| |
| .p2align 4 |
| L(align64_loop): |
| sub $64, %ecx |
| sub $64, %edx |
| jbe L(exit_loop) |
| |
| movdqa (%ecx), %xmm0 |
| movdqa 16(%ecx), %xmm2 |
| movdqa 32(%ecx), %xmm3 |
| movdqa 48(%ecx), %xmm4 |
| |
| pcmpeqb %xmm1, %xmm0 |
| pcmpeqb %xmm1, %xmm2 |
| pcmpeqb %xmm1, %xmm3 |
| pcmpeqb %xmm1, %xmm4 |
| |
| pmaxub %xmm3, %xmm0 |
| pmaxub %xmm4, %xmm2 |
| pmaxub %xmm0, %xmm2 |
| pmovmskb %xmm2, %eax |
| |
| test %eax, %eax |
| jz L(align64_loop) |
| |
| pmovmskb %xmm4, %eax |
| test %eax, %eax |
| jnz L(matches48) |
| |
| pmovmskb %xmm3, %eax |
| test %eax, %eax |
| jnz L(matches32) |
| |
| movdqa 16(%ecx), %xmm2 |
| |
| pcmpeqb %xmm1, %xmm2 |
| pcmpeqb (%ecx), %xmm1 |
| |
| pmovmskb %xmm2, %eax |
| test %eax, %eax |
| jnz L(matches16) |
| |
| pmovmskb %xmm1, %eax |
| test %ah, %ah |
| jnz L(exit_dispatch_high) |
| mov %al, %dl |
| and $15 << 4, %dl |
| jnz L(exit_dispatch_8) |
| test $0x08, %al |
| jnz L(exit_4) |
| test $0x04, %al |
| jnz L(exit_3) |
| test $0x02, %al |
| jnz L(exit_2) |
| mov %ecx, %eax |
| ret |
| |
| .p2align 4 |
| L(exit_loop): |
| add $64, %edx |
| cmp $32, %edx |
| jbe L(exit_loop_32) |
| |
| movdqa 48(%ecx), %xmm0 |
| pcmpeqb %xmm1, %xmm0 |
| pmovmskb %xmm0, %eax |
| test %eax, %eax |
| jnz L(matches48) |
| |
| movdqa 32(%ecx), %xmm2 |
| pcmpeqb %xmm1, %xmm2 |
| pmovmskb %xmm2, %eax |
| test %eax, %eax |
| jnz L(matches32) |
| |
| movdqa 16(%ecx), %xmm3 |
| pcmpeqb %xmm1, %xmm3 |
| pmovmskb %xmm3, %eax |
| test %eax, %eax |
| jnz L(matches16_1) |
| cmp $48, %edx |
| jbe L(return_null) |
| |
| pcmpeqb (%ecx), %xmm1 |
| pmovmskb %xmm1, %eax |
| test %eax, %eax |
| jnz L(matches0_1) |
| xor %eax, %eax |
| ret |
| |
| .p2align 4 |
| L(exit_loop_32): |
| movdqa 48(%ecx), %xmm0 |
| pcmpeqb %xmm1, %xmm0 |
| pmovmskb %xmm0, %eax |
| test %eax, %eax |
| jnz L(matches48_1) |
| cmp $16, %edx |
| jbe L(return_null) |
| |
| pcmpeqb 32(%ecx), %xmm1 |
| pmovmskb %xmm1, %eax |
| test %eax, %eax |
| jnz L(matches32_1) |
| xor %eax, %eax |
| ret |
| |
| .p2align 4 |
| L(matches16): |
| lea 16(%ecx), %ecx |
| test %ah, %ah |
| jnz L(exit_dispatch_high) |
| mov %al, %dl |
| and $15 << 4, %dl |
| jnz L(exit_dispatch_8) |
| test $0x08, %al |
| jnz L(exit_4) |
| test $0x04, %al |
| jnz L(exit_3) |
| test $0x02, %al |
| jnz L(exit_2) |
| mov %ecx, %eax |
| ret |
| |
| .p2align 4 |
| L(matches32): |
| lea 32(%ecx), %ecx |
| test %ah, %ah |
| jnz L(exit_dispatch_high) |
| mov %al, %dl |
| and $15 << 4, %dl |
| jnz L(exit_dispatch_8) |
| test $0x08, %al |
| jnz L(exit_4) |
| test $0x04, %al |
| jnz L(exit_3) |
| test $0x02, %al |
| jnz L(exit_2) |
| mov %ecx, %eax |
| ret |
| |
| .p2align 4 |
| L(matches48): |
| lea 48(%ecx), %ecx |
| |
| .p2align 4 |
| L(exit_dispatch): |
| test %ah, %ah |
| jnz L(exit_dispatch_high) |
| mov %al, %dl |
| and $15 << 4, %dl |
| jnz L(exit_dispatch_8) |
| test $0x08, %al |
| jnz L(exit_4) |
| test $0x04, %al |
| jnz L(exit_3) |
| test $0x02, %al |
| jnz L(exit_2) |
| mov %ecx, %eax |
| ret |
| |
| .p2align 4 |
| L(exit_dispatch_8): |
| test $0x80, %al |
| jnz L(exit_8) |
| test $0x40, %al |
| jnz L(exit_7) |
| test $0x20, %al |
| jnz L(exit_6) |
| lea 4(%ecx), %eax |
| ret |
| |
| .p2align 4 |
| L(exit_dispatch_high): |
| mov %ah, %dh |
| and $15 << 4, %dh |
| jnz L(exit_dispatch_high_8) |
| test $0x08, %ah |
| jnz L(exit_12) |
| test $0x04, %ah |
| jnz L(exit_11) |
| test $0x02, %ah |
| jnz L(exit_10) |
| lea 8(%ecx), %eax |
| ret |
| |
| .p2align 4 |
| L(exit_dispatch_high_8): |
| test $0x80, %ah |
| jnz L(exit_16) |
| test $0x40, %ah |
| jnz L(exit_15) |
| test $0x20, %ah |
| jnz L(exit_14) |
| lea 12(%ecx), %eax |
| ret |
| |
| .p2align 4 |
| L(exit_2): |
| lea 1(%ecx), %eax |
| ret |
| |
| .p2align 4 |
| L(exit_3): |
| lea 2(%ecx), %eax |
| ret |
| |
| .p2align 4 |
| L(exit_4): |
| lea 3(%ecx), %eax |
| ret |
| |
| .p2align 4 |
| L(exit_6): |
| lea 5(%ecx), %eax |
| ret |
| |
| .p2align 4 |
| L(exit_7): |
| lea 6(%ecx), %eax |
| ret |
| |
| .p2align 4 |
| L(exit_8): |
| lea 7(%ecx), %eax |
| ret |
| |
| .p2align 4 |
| L(exit_10): |
| lea 9(%ecx), %eax |
| ret |
| |
| .p2align 4 |
| L(exit_11): |
| lea 10(%ecx), %eax |
| ret |
| |
| .p2align 4 |
| L(exit_12): |
| lea 11(%ecx), %eax |
| ret |
| |
| .p2align 4 |
| L(exit_14): |
| lea 13(%ecx), %eax |
| ret |
| |
| .p2align 4 |
| L(exit_15): |
| lea 14(%ecx), %eax |
| ret |
| |
| .p2align 4 |
| L(exit_16): |
| lea 15(%ecx), %eax |
| ret |
| |
| .p2align 4 |
| L(matches0_1): |
| lea -64(%edx), %edx |
| |
| test %ah, %ah |
| jnz L(exit_dispatch_1_high) |
| mov %al, %ah |
| and $15 << 4, %ah |
| jnz L(exit_dispatch_1_8) |
| test $0x08, %al |
| jnz L(exit_1_4) |
| test $0x04, %al |
| jnz L(exit_1_3) |
| test $0x02, %al |
| jnz L(exit_1_2) |
| |
| add $0, %edx |
| jl L(return_null) |
| mov %ecx, %eax |
| ret |
| |
| .p2align 4 |
| L(matches16_1): |
| lea -48(%edx), %edx |
| lea 16(%ecx), %ecx |
| |
| test %ah, %ah |
| jnz L(exit_dispatch_1_high) |
| mov %al, %ah |
| and $15 << 4, %ah |
| jnz L(exit_dispatch_1_8) |
| test $0x08, %al |
| jnz L(exit_1_4) |
| test $0x04, %al |
| jnz L(exit_1_3) |
| test $0x02, %al |
| jnz L(exit_1_2) |
| |
| add $0, %edx |
| jl L(return_null) |
| mov %ecx, %eax |
| ret |
| |
| .p2align 4 |
| L(matches32_1): |
| lea -32(%edx), %edx |
| lea 32(%ecx), %ecx |
| |
| test %ah, %ah |
| jnz L(exit_dispatch_1_high) |
| mov %al, %ah |
| and $15 << 4, %ah |
| jnz L(exit_dispatch_1_8) |
| test $0x08, %al |
| jnz L(exit_1_4) |
| test $0x04, %al |
| jnz L(exit_1_3) |
| test $0x02, %al |
| jnz L(exit_1_2) |
| |
| add $0, %edx |
| jl L(return_null) |
| mov %ecx, %eax |
| ret |
| |
| .p2align 4 |
| L(matches48_1): |
| lea -16(%edx), %edx |
| lea 48(%ecx), %ecx |
| |
| .p2align 4 |
| L(exit_dispatch_1): |
| test %ah, %ah |
| jnz L(exit_dispatch_1_high) |
| mov %al, %ah |
| and $15 << 4, %ah |
| jnz L(exit_dispatch_1_8) |
| test $0x08, %al |
| jnz L(exit_1_4) |
| test $0x04, %al |
| jnz L(exit_1_3) |
| test $0x02, %al |
| jnz L(exit_1_2) |
| |
| add $0, %edx |
| jl L(return_null) |
| mov %ecx, %eax |
| ret |
| |
| .p2align 4 |
| L(exit_dispatch_1_8): |
| test $0x80, %al |
| jnz L(exit_1_8) |
| test $0x40, %al |
| jnz L(exit_1_7) |
| test $0x20, %al |
| jnz L(exit_1_6) |
| |
| add $4, %edx |
| jl L(return_null) |
| lea 4(%ecx), %eax |
| ret |
| |
| .p2align 4 |
| L(exit_dispatch_1_high): |
| mov %ah, %al |
| and $15 << 4, %al |
| jnz L(exit_dispatch_1_high_8) |
| test $0x08, %ah |
| jnz L(exit_1_12) |
| test $0x04, %ah |
| jnz L(exit_1_11) |
| test $0x02, %ah |
| jnz L(exit_1_10) |
| |
| add $8, %edx |
| jl L(return_null) |
| lea 8(%ecx), %eax |
| ret |
| |
| .p2align 4 |
| L(exit_dispatch_1_high_8): |
| test $0x80, %ah |
| jnz L(exit_1_16) |
| test $0x40, %ah |
| jnz L(exit_1_15) |
| test $0x20, %ah |
| jnz L(exit_1_14) |
| |
| add $12, %edx |
| jl L(return_null) |
| lea 12(%ecx), %eax |
| ret |
| |
| .p2align 4 |
| L(exit_1_2): |
| add $1, %edx |
| jl L(return_null) |
| lea 1(%ecx), %eax |
| ret |
| |
| .p2align 4 |
| L(exit_1_3): |
| add $2, %edx |
| jl L(return_null) |
| lea 2(%ecx), %eax |
| ret |
| |
| .p2align 4 |
| L(exit_1_4): |
| add $3, %edx |
| jl L(return_null) |
| lea 3(%ecx), %eax |
| ret |
| |
| .p2align 4 |
| L(exit_1_6): |
| add $5, %edx |
| jl L(return_null) |
| lea 5(%ecx), %eax |
| ret |
| |
| .p2align 4 |
| L(exit_1_7): |
| add $6, %edx |
| jl L(return_null) |
| lea 6(%ecx), %eax |
| ret |
| |
| .p2align 4 |
| L(exit_1_8): |
| add $7, %edx |
| jl L(return_null) |
| lea 7(%ecx), %eax |
| ret |
| |
| .p2align 4 |
| L(exit_1_10): |
| add $9, %edx |
| jl L(return_null) |
| lea 9(%ecx), %eax |
| ret |
| |
| .p2align 4 |
| L(exit_1_11): |
| add $10, %edx |
| jl L(return_null) |
| lea 10(%ecx), %eax |
| ret |
| |
| .p2align 4 |
| L(exit_1_12): |
| add $11, %edx |
| jl L(return_null) |
| lea 11(%ecx), %eax |
| ret |
| |
| .p2align 4 |
| L(exit_1_14): |
| add $13, %edx |
| jl L(return_null) |
| lea 13(%ecx), %eax |
| ret |
| |
| .p2align 4 |
| L(exit_1_15): |
| add $14, %edx |
| jl L(return_null) |
| lea 14(%ecx), %eax |
| ret |
| |
| .p2align 4 |
| L(exit_1_16): |
| add $15, %edx |
| jl L(return_null) |
| lea 15(%ecx), %eax |
| ret |
| |
| .p2align 4 |
| L(return_null): |
| xor %eax, %eax |
| ret |
| |
| .p2align 4 |
| L(length_less16_offset0): |
| mov %dl, %cl |
| pcmpeqb (%eax), %xmm1 |
| |
| mov $1, %edx |
| sal %cl, %edx |
| sub $1, %edx |
| |
| mov %eax, %ecx |
| pmovmskb %xmm1, %eax |
| |
| and %edx, %eax |
| test %eax, %eax |
| jnz L(exit_dispatch) |
| |
| xor %eax, %eax |
| ret |
| |
| .p2align 4 |
| L(length_less16): |
| punpcklbw %xmm1, %xmm1 |
| add $16, %edx |
| punpcklbw %xmm1, %xmm1 |
| |
| mov %ecx, %eax |
| pshufd $0, %xmm1, %xmm1 |
| |
| and $15, %ecx |
| jz L(length_less16_offset0) |
| |
| PUSH (%edi) |
| |
| mov %cl, %dh |
| add %dl, %dh |
| and $-16, %eax |
| |
| sub $16, %dh |
| ja L(length_less16_part2) |
| |
| pcmpeqb (%eax), %xmm1 |
| pmovmskb %xmm1, %edi |
| |
| sar %cl, %edi |
| add %ecx, %eax |
| mov %dl, %cl |
| |
| mov $1, %edx |
| sal %cl, %edx |
| sub $1, %edx |
| |
| and %edx, %edi |
| test %edi, %edi |
| jz L(ret_null) |
| |
| bsr %edi, %edi |
| add %edi, %eax |
| POP (%edi) |
| ret |
| |
| CFI_PUSH (%edi) |
| |
| .p2align 4 |
| L(length_less16_part2): |
| movdqa 16(%eax), %xmm2 |
| pcmpeqb %xmm1, %xmm2 |
| pmovmskb %xmm2, %edi |
| |
| mov %cl, %ch |
| |
| mov %dh, %cl |
| mov $1, %edx |
| sal %cl, %edx |
| sub $1, %edx |
| |
| and %edx, %edi |
| |
| test %edi, %edi |
| jnz L(length_less16_part2_return) |
| |
| pcmpeqb (%eax), %xmm1 |
| pmovmskb %xmm1, %edi |
| |
| mov %ch, %cl |
| sar %cl, %edi |
| test %edi, %edi |
| jz L(ret_null) |
| |
| bsr %edi, %edi |
| add %edi, %eax |
| xor %ch, %ch |
| add %ecx, %eax |
| POP (%edi) |
| ret |
| |
| CFI_PUSH (%edi) |
| |
| .p2align 4 |
| L(length_less16_part2_return): |
| bsr %edi, %edi |
| lea 16(%eax, %edi), %eax |
| POP (%edi) |
| ret |
| |
| CFI_PUSH (%edi) |
| |
| .p2align 4 |
| L(ret_null): |
| xor %eax, %eax |
| POP (%edi) |
| ret |
| |
| END (memrchr) |
