| // Copyright 2018 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| #include "go_asm.h" |
| #include "textflag.h" |
| |
| // memequal(a, b unsafe.Pointer, size uintptr) bool |
| TEXT runtime·memequal(SB),NOSPLIT|NOFRAME,$0-25 |
| MOVD a+0(FP), R3 |
| MOVD b+8(FP), R5 |
| MOVD size+16(FP), R6 |
| LA ret+24(FP), R7 |
| BR memeqbody<>(SB) |
| |
| // memequal_varlen(a, b unsafe.Pointer) bool |
| TEXT runtime·memequal_varlen(SB),NOSPLIT|NOFRAME,$0-17 |
| MOVD a+0(FP), R3 |
| MOVD b+8(FP), R5 |
| MOVD 8(R12), R6 // compiler stores size at offset 8 in the closure |
| LA ret+16(FP), R7 |
| BR memeqbody<>(SB) |
| |
| // input: |
| // R3 = a |
| // R5 = b |
| // R6 = len |
| // R7 = address of output byte (stores 0 or 1 here) |
| // a and b have the same length |
| TEXT memeqbody<>(SB),NOSPLIT|NOFRAME,$0-0 |
| CMPBEQ R3, R5, equal |
| loop: |
| CMPBEQ R6, $0, equal |
| CMPBLT R6, $32, tiny |
| CMP R6, $256 |
| BLT tail |
| CLC $256, 0(R3), 0(R5) |
| BNE notequal |
| SUB $256, R6 |
| LA 256(R3), R3 |
| LA 256(R5), R5 |
| BR loop |
| tail: |
| SUB $1, R6, R8 |
| EXRL $memeqbodyclc<>(SB), R8 |
| BEQ equal |
| notequal: |
| MOVB $0, 0(R7) |
| RET |
| equal: |
| MOVB $1, 0(R7) |
| RET |
| tiny: |
| MOVD $0, R2 |
| CMPBLT R6, $16, lt16 |
| MOVD 0(R3), R8 |
| MOVD 0(R5), R9 |
| CMPBNE R8, R9, notequal |
| MOVD 8(R3), R8 |
| MOVD 8(R5), R9 |
| CMPBNE R8, R9, notequal |
| LA 16(R2), R2 |
| SUB $16, R6 |
| lt16: |
| CMPBLT R6, $8, lt8 |
| MOVD 0(R3)(R2*1), R8 |
| MOVD 0(R5)(R2*1), R9 |
| CMPBNE R8, R9, notequal |
| LA 8(R2), R2 |
| SUB $8, R6 |
| lt8: |
| CMPBLT R6, $4, lt4 |
| MOVWZ 0(R3)(R2*1), R8 |
| MOVWZ 0(R5)(R2*1), R9 |
| CMPBNE R8, R9, notequal |
| LA 4(R2), R2 |
| SUB $4, R6 |
| lt4: |
| #define CHECK(n) \ |
| CMPBEQ R6, $n, equal \ |
| MOVB n(R3)(R2*1), R8 \ |
| MOVB n(R5)(R2*1), R9 \ |
| CMPBNE R8, R9, notequal |
| CHECK(0) |
| CHECK(1) |
| CHECK(2) |
| CHECK(3) |
| BR equal |
| |
| TEXT memeqbodyclc<>(SB),NOSPLIT|NOFRAME,$0-0 |
| CLC $1, 0(R3), 0(R5) |
| RET |
