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Diffstat (limited to '')
| -rw-r--r-- | src/runtime/memclr_mipsx.s | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/src/runtime/memclr_mipsx.s b/src/runtime/memclr_mipsx.s new file mode 100644 index 0000000..eb2a8a7 --- /dev/null +++ b/src/runtime/memclr_mipsx.s @@ -0,0 +1,73 @@ +// Copyright 2016 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 "textflag.h" + +#ifdef GOARCH_mips +#define MOVWHI MOVWL +#define MOVWLO MOVWR +#else +#define MOVWHI MOVWR +#define MOVWLO MOVWL +#endif + +// See memclrNoHeapPointers Go doc for important implementation constraints. + +// func memclrNoHeapPointers(ptr unsafe.Pointer, n uintptr) +TEXT runtime·memclrNoHeapPointers(SB),NOSPLIT,$0-8 + MOVW n+4(FP), R2 + MOVW ptr+0(FP), R1 + + SGTU $4, R2, R3 + ADDU R2, R1, R4 + BNE R3, small_zero + +ptr_align: + AND $3, R1, R3 + BEQ R3, setup + SUBU R1, R0, R3 + AND $3, R3 // R3 contains number of bytes needed to align ptr + MOVWHI R0, 0(R1) // MOVWHI will write zeros up to next word boundary + SUBU R3, R2 + ADDU R3, R1 + +setup: + AND $31, R2, R6 + AND $3, R2, R5 + SUBU R6, R4, R6 // end pointer for 32-byte chunks + SUBU R5, R4, R5 // end pointer for 4-byte chunks + +large: + BEQ R1, R6, words + MOVW R0, 0(R1) + MOVW R0, 4(R1) + MOVW R0, 8(R1) + MOVW R0, 12(R1) + MOVW R0, 16(R1) + MOVW R0, 20(R1) + MOVW R0, 24(R1) + MOVW R0, 28(R1) + ADDU $32, R1 + JMP large + +words: + BEQ R1, R5, tail + MOVW R0, 0(R1) + ADDU $4, R1 + JMP words + +tail: + BEQ R1, R4, ret + MOVWLO R0, -1(R4) + +ret: + RET + +small_zero: + BEQ R1, R4, ret + MOVB R0, 0(R1) + ADDU $1, R1 + JMP small_zero |