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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
// 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
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