blob: 47c6b73c84d440c11c785f218db2cc9b20c54bb5 [file] [log] [blame]
// Copyright 2014 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"
// void runtime·memclr(void*, uintptr)
TEXT runtime·memclr(SB),NOSPLIT,$0-16
MOVD ptr+0(FP), R3
MOVD n+8(FP), R4
// TODO(mwhudson): this is written this way to avoid tickling
// warnings from addpool when written as AND $7, R4, R6 (see
AND $~7, R4, R5 // R5 is N&~7
SUB R5, R4, R6 // R6 is N&7
CMP $0, R5
BEQ nowords
ADD R3, R5, R5
wordloop: // TODO: Optimize for unaligned ptr.
MOVD.P $0, 8(R3)
CMP R3, R5
BNE wordloop
CMP $0, R6
BEQ done
ADD R3, R6, R6
MOVBU.P $0, 1(R3)
CMP R3, R6
BNE byteloop