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 11#ifdef __LITTLE_ENDIAN__ 12#define WORD2 r2 13#define SHIFT r3 14#else /* BIG ENDIAN */ 15#define WORD2 r3 16#define SHIFT r2 17#endif 18 19ARC_ENTRY memcmp 20 or r12,r0,r1 21 asl_s r12,r12,30 22 sub r3,r2,1 23 brls r2,r12,.Lbytewise 24 ld r4,[r0,0] 25 ld r5,[r1,0] 26 lsr.f lp_count,r3,3 27 lpne .Loop_end 28 ld_s WORD2,[r0,4] 29 ld_s r12,[r1,4] 30 brne r4,r5,.Leven 31 ld.a r4,[r0,8] 32 ld.a r5,[r1,8] 33 brne WORD2,r12,.Lodd 34.Loop_end: 35 asl_s SHIFT,SHIFT,3 36 bhs_s .Last_cmp 37 brne r4,r5,.Leven 38 ld r4,[r0,4] 39 ld r5,[r1,4] 40#ifdef __LITTLE_ENDIAN__ 41 nop_s 42 ; one more load latency cycle 43.Last_cmp: 44 xor r0,r4,r5 45 bset r0,r0,SHIFT 46 sub_s r1,r0,1 47 bic_s r1,r1,r0 48 norm r1,r1 49 b.d .Leven_cmp 50 and r1,r1,24 51.Leven: 52 xor r0,r4,r5 53 sub_s r1,r0,1 54 bic_s r1,r1,r0 55 norm r1,r1 56 ; slow track insn 57 and r1,r1,24 58.Leven_cmp: 59 asl r2,r4,r1 60 asl r12,r5,r1 61 lsr_s r2,r2,1 62 lsr_s r12,r12,1 63 j_s.d [blink] 64 sub r0,r2,r12 65 .balign 4 66.Lodd: 67 xor r0,WORD2,r12 68 sub_s r1,r0,1 69 bic_s r1,r1,r0 70 norm r1,r1 71 ; slow track insn 72 and r1,r1,24 73 asl_s r2,r2,r1 74 asl_s r12,r12,r1 75 lsr_s r2,r2,1 76 lsr_s r12,r12,1 77 j_s.d [blink] 78 sub r0,r2,r12 79#else /* BIG ENDIAN */ 80.Last_cmp: 81 neg_s SHIFT,SHIFT 82 lsr r4,r4,SHIFT 83 lsr r5,r5,SHIFT 84 ; slow track insn 85.Leven: 86 sub.f r0,r4,r5 87 mov.ne r0,1 88 j_s.d [blink] 89 bset.cs r0,r0,31 90.Lodd: 91 cmp_s WORD2,r12 92 93 mov_s r0,1 94 j_s.d [blink] 95 bset.cs r0,r0,31 96#endif /* ENDIAN */ 97 .balign 4 98.Lbytewise: 99 breq r2,0,.Lnil 100 ldb r4,[r0,0] 101 ldb r5,[r1,0] 102 lsr.f lp_count,r3 103 lpne .Lbyte_end 104 ldb_s r3,[r0,1] 105 ldb r12,[r1,1] 106 brne r4,r5,.Lbyte_even 107 ldb.a r4,[r0,2] 108 ldb.a r5,[r1,2] 109 brne r3,r12,.Lbyte_odd 110.Lbyte_end: 111 bcc .Lbyte_even 112 brne r4,r5,.Lbyte_even 113 ldb_s r3,[r0,1] 114 ldb_s r12,[r1,1] 115.Lbyte_odd: 116 j_s.d [blink] 117 sub r0,r3,r12 118.Lbyte_even: 119 j_s.d [blink] 120 sub r0,r4,r5 121.Lnil: 122 j_s.d [blink] 123 mov r0,0 124ARC_EXIT memcmp 125