/* 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 8 #define ENTRANCE PUSH(%edi); #define RETURN POP(%edi); ret; CFI_PUSH(%edi); #define STR1 PARMS #define STR2 STR1+4 .text ENTRY (wcsrchr) ENTRANCE mov STR1(%esp), %ecx movd STR2(%esp), %xmm1 mov %ecx, %edi punpckldq %xmm1, %xmm1 pxor %xmm2, %xmm2 punpckldq %xmm1, %xmm1 /* ECX has OFFSET. */ and $63, %ecx cmp $48, %ecx ja L(crosscache) /* unaligned string. */ movdqu (%edi), %xmm0 pcmpeqd %xmm0, %xmm2 pcmpeqd %xmm1, %xmm0 /* Find where NULL is. */ pmovmskb %xmm2, %ecx /* Check if there is a match. */ pmovmskb %xmm0, %eax add $16, %edi test %eax, %eax jnz L(unaligned_match1) test %ecx, %ecx jnz L(return_null) and $-16, %edi PUSH (%esi) xor %edx, %edx jmp L(loop) CFI_POP (%esi) .p2align 4 L(unaligned_match1): test %ecx, %ecx jnz L(prolog_find_zero_1) PUSH (%esi) /* Save current match */ mov %eax, %edx mov %edi, %esi and $-16, %edi jmp L(loop) CFI_POP (%esi) .p2align 4 L(crosscache): /* Hancle unaligned string. */ and $15, %ecx and $-16, %edi pxor %xmm3, %xmm3 movdqa (%edi), %xmm0 pcmpeqd %xmm0, %xmm3 pcmpeqd %xmm1, %xmm0 /* Find where NULL is. */ pmovmskb %xmm3, %edx /* Check if there is a match. */ pmovmskb %xmm0, %eax /* Remove the leading bytes. */ shr %cl, %edx shr %cl, %eax add $16, %edi test %eax, %eax jnz L(unaligned_match) test %edx, %edx jnz L(return_null) PUSH (%esi) xor %edx, %edx jmp L(loop) CFI_POP (%esi) .p2align 4 L(unaligned_match): test %edx, %edx jnz L(prolog_find_zero) PUSH (%esi) mov %eax, %edx lea (%edi, %ecx), %esi /* Loop start on aligned string. */ .p2align 4 L(loop): movdqa (%edi), %xmm0 pcmpeqd %xmm0, %xmm2 add $16, %edi pcmpeqd %xmm1, %xmm0 pmovmskb %xmm2, %ecx pmovmskb %xmm0, %eax or %eax, %ecx jnz L(matches) movdqa (%edi), %xmm3 pcmpeqd %xmm3, %xmm2 add $16, %edi pcmpeqd %xmm1, %xmm3 pmovmskb %xmm2, %ecx pmovmskb %xmm3, %eax or %eax, %ecx jnz L(matches) movdqa (%edi), %xmm4 pcmpeqd %xmm4, %xmm2 add $16, %edi pcmpeqd %xmm1, %xmm4 pmovmskb %xmm2, %ecx pmovmskb %xmm4, %eax or %eax, %ecx jnz L(matches) movdqa (%edi), %xmm5 pcmpeqd %xmm5, %xmm2 add $16, %edi pcmpeqd %xmm1, %xmm5 pmovmskb %xmm2, %ecx pmovmskb %xmm5, %eax or %eax, %ecx jz L(loop) .p2align 4 L(matches): test %eax, %eax jnz L(match) L(return_value): test %edx, %edx jz L(return_null_1) mov %edx, %eax mov %esi, %edi POP (%esi) test %ah, %ah jnz L(match_third_or_fourth_wchar) test $15 << 4, %al jnz L(match_second_wchar) lea -16(%edi), %eax RETURN CFI_PUSH (%esi) .p2align 4 L(return_null_1): POP (%esi) xor %eax, %eax RETURN CFI_PUSH (%esi) .p2align 4 L(match): pmovmskb %xmm2, %ecx test %ecx, %ecx jnz L(find_zero) /* save match info */ mov %eax, %edx mov %edi, %esi jmp L(loop) .p2align 4 L(find_zero): test %cl, %cl jz L(find_zero_in_third_or_fourth_wchar) test $15, %cl jz L(find_zero_in_second_wchar) and $1, %eax jz L(return_value) POP (%esi) lea -16(%edi), %eax RETURN CFI_PUSH (%esi) .p2align 4 L(find_zero_in_second_wchar): and $(1 << 5) - 1, %eax jz L(return_value) POP (%esi) test $15 << 4, %al jnz L(match_second_wchar) lea -16(%edi), %eax RETURN CFI_PUSH (%esi) .p2align 4 L(find_zero_in_third_or_fourth_wchar): test $15, %ch jz L(find_zero_in_fourth_wchar) and $(1 << 9) - 1, %eax jz L(return_value) POP (%esi) test %ah, %ah jnz L(match_third_wchar) test $15 << 4, %al jnz L(match_second_wchar) lea -16(%edi), %eax RETURN CFI_PUSH (%esi) .p2align 4 L(find_zero_in_fourth_wchar): POP (%esi) test %ah, %ah jnz L(match_third_or_fourth_wchar) test $15 << 4, %al jnz L(match_second_wchar) lea -16(%edi), %eax RETURN CFI_PUSH (%esi) .p2align 4 L(match_second_wchar): lea -12(%edi), %eax RETURN .p2align 4 L(match_third_or_fourth_wchar): test $15 << 4, %ah jnz L(match_fourth_wchar) lea -8(%edi), %eax RETURN .p2align 4 L(match_third_wchar): lea -8(%edi), %eax RETURN .p2align 4 L(match_fourth_wchar): lea -4(%edi), %eax RETURN .p2align 4 L(return_null): xor %eax, %eax RETURN .p2align 4 L(prolog_find_zero): add %ecx, %edi mov %edx, %ecx L(prolog_find_zero_1): test %cl, %cl jz L(prolog_find_zero_in_third_or_fourth_wchar) test $15, %cl jz L(prolog_find_zero_in_second_wchar) and $1, %eax jz L(return_null) lea -16(%edi), %eax RETURN .p2align 4 L(prolog_find_zero_in_second_wchar): and $(1 << 5) - 1, %eax jz L(return_null) test $15 << 4, %al jnz L(match_second_wchar) lea -16(%edi), %eax RETURN .p2align 4 L(prolog_find_zero_in_third_or_fourth_wchar): test $15, %ch jz L(prolog_find_zero_in_fourth_wchar) and $(1 << 9) - 1, %eax jz L(return_null) test %ah, %ah jnz L(match_third_wchar) test $15 << 4, %al jnz L(match_second_wchar) lea -16(%edi), %eax RETURN .p2align 4 L(prolog_find_zero_in_fourth_wchar): test %ah, %ah jnz L(match_third_or_fourth_wchar) test $15 << 4, %al jnz L(match_second_wchar) lea -16(%edi), %eax RETURN END (wcsrchr)