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c83b5fefab
Update #40724 Co-authored-by: Xiaolin Zhao <zhaoxiaolin@loongson.cn> Change-Id: I55c78bab5c697ea6c30f9d81f5f8fb75abb3987c Reviewed-on: https://go-review.googlesource.com/c/go/+/521786 TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Cherry Mui <cherryyz@google.com> Reviewed-by: Meidan Li <limeidan@loongson.cn> Run-TryBot: David Chase <drchase@google.com> Auto-Submit: David Chase <drchase@google.com> Reviewed-by: David Chase <drchase@google.com>
45 lines
843 B
ArmAsm
45 lines
843 B
ArmAsm
// Copyright 2022 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 "go_asm.h"
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#include "textflag.h"
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// func memclrNoHeapPointers(ptr unsafe.Pointer, n uintptr)
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TEXT runtime·memclrNoHeapPointers<ABIInternal>(SB),NOSPLIT,$0-16
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#ifndef GOEXPERIMENT_regabiargs
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MOVV ptr+0(FP), R4
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MOVV n+8(FP), R5
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#endif
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ADDV R4, R5, R6
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// if less than 8 bytes, do one byte at a time
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SGTU $8, R5, R8
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BNE R8, out
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// do one byte at a time until 8-aligned
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AND $7, R4, R8
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BEQ R8, words
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MOVB R0, (R4)
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ADDV $1, R4
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JMP -4(PC)
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words:
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// do 8 bytes at a time if there is room
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ADDV $-7, R6, R5
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PCALIGN $16
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SGTU R5, R4, R8
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BEQ R8, out
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MOVV R0, (R4)
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ADDV $8, R4
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JMP -4(PC)
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out:
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BEQ R4, R6, done
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MOVB R0, (R4)
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ADDV $1, R4
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JMP -3(PC)
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done:
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RET
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