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// Copyright 2018 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 memmove Go doc for important implementation constraints.
// func memmove(to, from unsafe.Pointer, n uintptr)
TEXT runtime·memmove(SB), NOSPLIT, $0-24
MOVD to+0(FP), R0
MOVD from+8(FP), R1
MOVD n+16(FP), R2
Get R0
Get R1
I64LtU
If // forward
exit_forward_64:
Block
loop_forward_64:
Loop
Get R2
I64Const $8
I64LtU
BrIf exit_forward_64
MOVD 0(R1), 0(R0)
Get R0
I64Const $8
I64Add
Set R0
Get R1
I64Const $8
I64Add
Set R1
Get R2
I64Const $8
I64Sub
Set R2
Br loop_forward_64
End
End
loop_forward_8:
Loop
Get R2
I64Eqz
If
RET
End
Get R0
I32WrapI64
I64Load8U (R1)
I64Store8 $0
Get R0
I64Const $1
I64Add
Set R0
Get R1
I64Const $1
I64Add
Set R1
Get R2
I64Const $1
I64Sub
Set R2
Br loop_forward_8
End
Else
// backward
Get R0
Get R2
I64Add
Set R0
Get R1
Get R2
I64Add
Set R1
exit_backward_64:
Block
loop_backward_64:
Loop
Get R2
I64Const $8
I64LtU
BrIf exit_backward_64
Get R0
I64Const $8
I64Sub
Set R0
Get R1
I64Const $8
I64Sub
Set R1
Get R2
I64Const $8
I64Sub
Set R2
MOVD 0(R1), 0(R0)
Br loop_backward_64
End
End
loop_backward_8:
Loop
Get R2
I64Eqz
If
RET
End
Get R0
I64Const $1
I64Sub
Set R0
Get R1
I64Const $1
I64Sub
Set R1
Get R2
I64Const $1
I64Sub
Set R2
Get R0
I32WrapI64
I64Load8U (R1)
I64Store8 $0
Br loop_backward_8
End
End
UNDEF
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