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| // 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
|
| // 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
|
|
