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https://github.com/golang/go
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72 lines
1.2 KiB
ArmAsm
72 lines
1.2 KiB
ArmAsm
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// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build mips mipsle
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#include "textflag.h"
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#ifdef GOARCH_mips
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#define MOVWHI MOVWL
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#define MOVWLO MOVWR
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#else
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#define MOVWHI MOVWR
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#define MOVWLO MOVWL
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#endif
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// void runtime·memclrNoHeapPointers(void*, uintptr)
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TEXT runtime·memclrNoHeapPointers(SB),NOSPLIT,$0-8
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MOVW n+4(FP), R2
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MOVW ptr+0(FP), R1
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SGTU $4, R2, R3
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ADDU R2, R1, R4
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BNE R3, small_zero
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ptr_align:
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AND $3, R1, R3
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BEQ R3, setup
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SUBU R1, R0, R3
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AND $3, R3 // R3 contains number of bytes needed to align ptr
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MOVWHI R0, 0(R1) // MOVWHI will write zeros up to next word boundary
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SUBU R3, R2
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ADDU R3, R1
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setup:
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AND $31, R2, R6
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AND $3, R2, R5
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SUBU R6, R4, R6 // end pointer for 32-byte chunks
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SUBU R5, R4, R5 // end pointer for 4-byte chunks
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large:
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BEQ R1, R6, words
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MOVW R0, 0(R1)
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MOVW R0, 4(R1)
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MOVW R0, 8(R1)
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MOVW R0, 12(R1)
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MOVW R0, 16(R1)
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MOVW R0, 20(R1)
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MOVW R0, 24(R1)
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MOVW R0, 28(R1)
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ADDU $32, R1
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JMP large
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words:
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BEQ R1, R5, tail
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MOVW R0, 0(R1)
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ADDU $4, R1
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JMP words
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tail:
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BEQ R1, R4, ret
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MOVWLO R0, -1(R4)
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ret:
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RET
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small_zero:
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BEQ R1, R4, ret
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MOVB R0, 0(R1)
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ADDU $1, R1
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JMP small_zero
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