1/* 2 Copyright (c) 2015-2024, Synopsys, Inc. All rights reserved. 3 4 Redistribution and use in source and binary forms, with or without 5 modification, are permitted provided that the following conditions are met: 6 7 1) Redistributions of source code must retain the above copyright notice, 8 this list of conditions and the following disclaimer. 9 10 2) Redistributions in binary form must reproduce the above copyright notice, 11 this list of conditions and the following disclaimer in the documentation 12 and/or other materials provided with the distribution. 13 14 3) Neither the name of the Synopsys, Inc., nor the names of its contributors 15 may be used to endorse or promote products derived from this software 16 without specific prior written permission. 17 18 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 19 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 22 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 POSSIBILITY OF SUCH DAMAGE. 29*/ 30 31/* This implementation is optimized for performance. For code size a generic 32 implementation of this function from newlib/libc/string/strcmp.c will be 33 used. */ 34#include <picolibc.h> 35 36#if !defined (__OPTIMIZE_SIZE__) && !defined (PREFER_SIZE_OVER_SPEED) \ 37 && !defined (__ARC_RF16__) 38 39#include "asm.h" 40 41#ifdef __ARCHS__ 42ENTRY (strcmp) 43 or r2, r0, r1 44 bmsk_s r2, r2, 1 45 brne r2, 0, .Lcharloop 46 47; s1 and s2 are word aligned 48 ld.ab r2, [r0, 4] 49 50 mov_s r12, 0x01010101 51 ror r11, r12 52 .align 4 53.LwordLoop: 54 ld.ab r3, [r1, 4] 55 ; Detect NULL char in str1 56 sub r4, r2, r12 57 ld.ab r5, [r0, 4] 58 bic r4, r4, r2 59 and r4, r4, r11 60 brne.d.nt r4, 0, .LfoundNULL 61 ; Check if the read locations are the same 62 cmp r2, r3 63 beq.d .LwordLoop 64 mov.eq r2, r5 65 66 ; A match is found, spot it out 67#ifdef __LITTLE_ENDIAN__ 68 swape r3, r3 69 mov_s r0, 1 70 swape r2, r2 71#else 72 mov_s r0, 1 73#endif 74 cmp_s r2, r3 75 j_s.d [blink] 76 bset.lo r0, r0, 31 77 78 .align 4 79.LfoundNULL: 80#ifdef __BIG_ENDIAN__ 81 swape r4, r4 82 swape r2, r2 83 swape r3, r3 84#endif 85 ; Find null byte 86 ffs r0, r4 87 bmsk r2, r2, r0 88 bmsk r3, r3, r0 89 swape r2, r2 90 swape r3, r3 91 ; make the return value 92 sub.f r0, r2, r3 93 mov.hi r0, 1 94 j_s.d [blink] 95 bset.lo r0, r0, 31 96 97 .align 4 98.Lcharloop: 99 ldb.ab r2, [r0, 1] 100 ldb.ab r3, [r1, 1] 101 nop 102 breq r2, 0, .Lcmpend 103 breq r2, r3, .Lcharloop 104 105 .align 4 106.Lcmpend: 107 j_s.d [blink] 108 sub r0, r2, r3 109ENDFUNC (strcmp) 110#endif /* __ARCHS__ */ 111 112#endif /* !__OPTIMIZE_SIZE__ && !PREFER_SIZE_OVER_SPEED */ 113
