| // 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. |
| |
| // +build mips mipsle |
| |
| #include "go_asm.h" |
| #include "textflag.h" |
| |
| TEXT ·Compare(SB),NOSPLIT,$0-28 |
| MOVW a_base+0(FP), R3 |
| MOVW b_base+12(FP), R4 |
| MOVW a_len+4(FP), R1 |
| MOVW b_len+16(FP), R2 |
| BEQ R3, R4, samebytes |
| SGTU R1, R2, R7 |
| MOVW R1, R8 |
| CMOVN R7, R2, R8 // R8 is min(R1, R2) |
| |
| ADDU R3, R8 // R3 is current byte in a, R8 is last byte in a to compare |
| loop: |
| BEQ R3, R8, samebytes |
| |
| MOVBU (R3), R6 |
| ADDU $1, R3 |
| MOVBU (R4), R7 |
| ADDU $1, R4 |
| BEQ R6, R7 , loop |
| |
| SGTU R6, R7, R8 |
| MOVW $-1, R6 |
| CMOVZ R8, R6, R8 |
| JMP cmp_ret |
| samebytes: |
| SGTU R1, R2, R6 |
| SGTU R2, R1, R7 |
| SUBU R7, R6, R8 |
| cmp_ret: |
| MOVW R8, ret+24(FP) |
| RET |
| |
| TEXT runtime·cmpstring(SB),NOSPLIT,$0-20 |
| MOVW a_base+0(FP), R3 |
| MOVW a_len+4(FP), R1 |
| MOVW b_base+8(FP), R4 |
| MOVW b_len+12(FP), R2 |
| BEQ R3, R4, samebytes |
| SGTU R1, R2, R7 |
| MOVW R1, R8 |
| CMOVN R7, R2, R8 // R8 is min(R1, R2) |
| |
| ADDU R3, R8 // R3 is current byte in a, R8 is last byte in a to compare |
| loop: |
| BEQ R3, R8, samebytes // all compared bytes were the same; compare lengths |
| |
| MOVBU (R3), R6 |
| ADDU $1, R3 |
| MOVBU (R4), R7 |
| ADDU $1, R4 |
| BEQ R6, R7 , loop |
| // bytes differed |
| SGTU R6, R7, R8 |
| MOVW $-1, R6 |
| CMOVZ R8, R6, R8 |
| JMP cmp_ret |
| samebytes: |
| SGTU R1, R2, R6 |
| SGTU R2, R1, R7 |
| SUBU R7, R6, R8 |
| cmp_ret: |
| MOVW R8, ret+16(FP) |
| RET |
