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Diffstat (limited to 'src/internal/bytealg/compare_mipsx.s')
| -rw-r--r-- | src/internal/bytealg/compare_mipsx.s | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/src/internal/bytealg/compare_mipsx.s b/src/internal/bytealg/compare_mipsx.s new file mode 100644 index 0000000..857ac13 --- /dev/null +++ b/src/internal/bytealg/compare_mipsx.s @@ -0,0 +1,72 @@ +// 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. + +//go: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 |