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49 lines
785 B
ArmAsm
49 lines
785 B
ArmAsm
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// Copyright 2014 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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#include "../../cmd/ld/textflag.h"
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// void runtime·memclr(void*, uintptr)
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TEXT runtime·memclr(SB), NOSPLIT, $0-16
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MOVQ ptr+0(FP), DI
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MOVQ n+8(FP), BX
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XORQ AX, AX
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clr_tail:
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TESTQ BX, BX
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JEQ clr_0
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CMPQ BX, $2
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JBE clr_1or2
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CMPQ BX, $4
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JBE clr_3or4
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CMPQ BX, $8
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JBE clr_5through8
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CMPQ BX, $16
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JBE clr_9through16
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MOVQ BX, CX
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SHRQ $2, CX
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REP
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STOSQ
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ANDQ $3, BX
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JNE clr_tail
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RET
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clr_1or2:
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MOVB AX, (DI)
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MOVB AX, -1(DI)(BX*1)
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clr_0:
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RET
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clr_3or4:
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MOVW AX, (DI)
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MOVW AX, -2(DI)(BX*1)
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RET
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clr_5through8:
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MOVL AX, (DI)
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MOVL AX, -4(DI)(BX*1)
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RET
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clr_9through16:
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MOVQ AX, (DI)
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MOVQ AX, -8(DI)(BX*1)
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RET
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