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go/src/runtime/memclr_amd64p32.s

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runtime: cleanup amd64p32 memmove and memclr file organization Move memclr to a separate file to make it consistent with other platforms asm function to file organization. Remove nacl from the memmove filename as the implementation is generic for the amd64p32 platform even if currently only nacl is supported for amd64p32. Change-Id: I8930b76da430a5cf2664801974e4f5185fc0f82f Reviewed-on: https://go-review.googlesource.com/61031 Run-TryBot: Martin Möhrmann <moehrmann@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Keith Randall <khr@golang.org>
2017-09-02 00:33:21 -06:00
// Copyright 2009 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.
#include "textflag.h"
runtime: use Go function signatures for memclr and memmove comments The function signatures in the comments used a C-like style. Using Go function signatures is cleaner. Change-Id: I1a093ed8fe5df59f3697c613cf3fce58bba4f5c1 Reviewed-on: https://go-review.googlesource.com/113876 Run-TryBot: Michael Munday <mike.munday@ibm.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2018-05-21 04:22:00 -06:00
// func memclrNoHeapPointers(ptr unsafe.Pointer, n uintptr)
runtime: cleanup amd64p32 memmove and memclr file organization Move memclr to a separate file to make it consistent with other platforms asm function to file organization. Remove nacl from the memmove filename as the implementation is generic for the amd64p32 platform even if currently only nacl is supported for amd64p32. Change-Id: I8930b76da430a5cf2664801974e4f5185fc0f82f Reviewed-on: https://go-review.googlesource.com/61031 Run-TryBot: Martin Möhrmann <moehrmann@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Keith Randall <khr@golang.org>
2017-09-02 00:33:21 -06:00
TEXT runtime·memclrNoHeapPointers(SB),NOSPLIT,$0-8
MOVL ptr+0(FP), DI
MOVL n+4(FP), CX
MOVQ CX, BX
ANDQ $3, BX
SHRQ $2, CX
MOVQ $0, AX
CLD
REP
STOSL
MOVQ BX, CX
REP
STOSB
// Note: we zero only 4 bytes at a time so that the tail is at most
// 3 bytes. That guarantees that we aren't zeroing pointers with STOSB.
// See issue 13160.
RET
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