1/* 2 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License version 2 as 6 * published by the Free Software Foundation. 7 */ 8 9#include <asm/linkage.h> 10 11ARC_ENTRY strlen 12 or r3,r0,7 13 ld r2,[r3,-7] 14 ld.a r6,[r3,-3] 15 mov r4,0x01010101 16 ; uses long immediate 17#ifdef __LITTLE_ENDIAN__ 18 asl_s r1,r0,3 19 btst_s r0,2 20 asl r7,r4,r1 21 ror r5,r4 22 sub r1,r2,r7 23 bic_s r1,r1,r2 24 mov.eq r7,r4 25 sub r12,r6,r7 26 bic r12,r12,r6 27 or.eq r12,r12,r1 28 and r12,r12,r5 29 brne r12,0,.Learly_end 30#else /* BIG ENDIAN */ 31 ror r5,r4 32 btst_s r0,2 33 mov_s r1,31 34 sub3 r7,r1,r0 35 sub r1,r2,r4 36 bic_s r1,r1,r2 37 bmsk r1,r1,r7 38 sub r12,r6,r4 39 bic r12,r12,r6 40 bmsk.ne r12,r12,r7 41 or.eq r12,r12,r1 42 and r12,r12,r5 43 brne r12,0,.Learly_end 44#endif /* ENDIAN */ 45 46.Loop: 47 ld_s r2,[r3,4] 48 ld.a r6,[r3,8] 49 ; stall for load result 50 sub r1,r2,r4 51 bic_s r1,r1,r2 52 sub r12,r6,r4 53 bic r12,r12,r6 54 or r12,r12,r1 55 and r12,r12,r5 56 breq r12,0,.Loop 57.Lend: 58 and.f r1,r1,r5 59 sub.ne r3,r3,4 60 mov.eq r1,r12 61#ifdef __LITTLE_ENDIAN__ 62 sub_s r2,r1,1 63 bic_s r2,r2,r1 64 norm r1,r2 65 sub_s r0,r0,3 66 lsr_s r1,r1,3 67 sub r0,r3,r0 68 j_s.d [blink] 69 sub r0,r0,r1 70#else /* BIG ENDIAN */ 71 lsr_s r1,r1,7 72 mov.eq r2,r6 73 bic_s r1,r1,r2 74 norm r1,r1 75 sub r0,r3,r0 76 lsr_s r1,r1,3 77 j_s.d [blink] 78 add r0,r0,r1 79#endif /* ENDIAN */ 80.Learly_end: 81 b.d .Lend 82 sub_s.ne r1,r1,r1 83ARC_EXIT strlen 84