blob: e4f20587b7b0c892c55b848f0dc1abcdc9a3426a [file] [log] [blame]
// Copyright 2022 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 "go_asm.h"
#include "textflag.h"
// func memclrNoHeapPointers(ptr unsafe.Pointer, n uintptr)
TEXT runtime·memclrNoHeapPointers(SB),NOSPLIT,$0-16
MOVV ptr+0(FP), R6
MOVV n+8(FP), R7
ADDV R6, R7, R4
// if less than 8 bytes, do one byte at a time
SGTU $8, R7, R8
BNE R8, out
// do one byte at a time until 8-aligned
AND $7, R6, R8
BEQ R8, words
MOVB R0, (R6)
ADDV $1, R6
JMP -4(PC)
// do 8 bytes at a time if there is room
ADDV $-7, R4, R7
SGTU R7, R6, R8
BEQ R8, out
MOVV R0, (R6)
ADDV $8, R6
JMP -4(PC)
BEQ R6, R4, done
MOVB R0, (R6)
ADDV $1, R6
JMP -3(PC)