/* Copyright (c) 2015, Synopsys, Inc. All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1) Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2) 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. 3) Neither the name of the Synopsys, Inc., 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 HOLDER 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. */ /* This implementation is optimized for performance. For code size a generic implementation of this function from newlib/libc/string/strcmp.c will be used. */ #if !defined (__OPTIMIZE_SIZE__) && !defined (PREFER_SIZE_OVER_SPEED) #include "asm.h" #ifdef __ARCHS__ ENTRY (strcmp) or r2, r0, r1 bmsk_s r2, r2, 1 brne r2, 0, @.Lcharloop ; s1 and s2 are word aligned ld.ab r2, [r0, 4] mov_s r12, 0x01010101 ror r11, r12 .align 4 .LwordLoop: ld.ab r3, [r1, 4] ; Detect NULL char in str1 sub r4, r2, r12 ld.ab r5, [r0, 4] bic r4, r4, r2 and r4, r4, r11 brne.d.nt r4, 0, .LfoundNULL ; Check if the read locations are the same cmp r2, r3 beq.d .LwordLoop mov.eq r2, r5 ; A match is found, spot it out #ifdef __LITTLE_ENDIAN__ swape r3, r3 mov_s r0, 1 swape r2, r2 #else mov_s r0, 1 #endif cmp_s r2, r3 j_s.d [blink] bset.lo r0, r0, 31 .align 4 .LfoundNULL: #ifdef __BIG_ENDIAN__ swape r4, r4 swape r2, r2 swape r3, r3 #endif ; Find null byte ffs r0, r4 bmsk r2, r2, r0 bmsk r3, r3, r0 swape r2, r2 swape r3, r3 ; make the return value sub.f r0, r2, r3 mov.hi r0, 1 j_s.d [blink] bset.lo r0, r0, 31 .align 4 .Lcharloop: ldb.ab r2, [r0, 1] ldb.ab r3, [r1, 1] nop breq r2, 0, .Lcmpend breq r2, r3, .Lcharloop .align 4 .Lcmpend: j_s.d [blink] sub r0, r2, r3 ENDFUNC (strcmp) #endif /* __ARCHS__ */ #endif /* !__OPTIMIZE_SIZE__ && !PREFER_SIZE_OVER_SPEED */