Current File : //usr/local/go/src/runtime/memclr_riscv64.s
// Copyright 2016 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"
// See memclrNoHeapPointers Go doc for important implementation constraints.
// void runtime·memclrNoHeapPointers(void*, uintptr)
TEXT runtime·memclrNoHeapPointers(SB),NOSPLIT,$0-16
MOV ptr+0(FP), T1
MOV n+8(FP), T2
ADD T1, T2, T4
// If less than eight bytes, do one byte at a time.
SLTU $8, T2, T3
BNE T3, ZERO, outcheck
// Do one byte at a time until eight-aligned.
JMP aligncheck
align:
MOVB ZERO, (T1)
ADD $1, T1
aligncheck:
AND $7, T1, T3
BNE T3, ZERO, align
// Do eight bytes at a time as long as there is room.
ADD $-7, T4, T5
JMP wordscheck
words:
MOV ZERO, (T1)
ADD $8, T1
wordscheck:
SLTU T5, T1, T3
BNE T3, ZERO, words
JMP outcheck
out:
MOVB ZERO, (T1)
ADD $1, T1
outcheck:
BNE T1, T4, out
done:
RET
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