mirror of
https://github.com/golang/go
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424738e43e
Change-Id: I9e94027ef66c88007107de2b2b75c3d7cf1352af Reviewed-on: https://go-review.googlesource.com/14467 Reviewed-by: Minux Ma <minux@golang.org>
106 lines
1.7 KiB
ArmAsm
106 lines
1.7 KiB
ArmAsm
// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build mips64 mips64le
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#include "textflag.h"
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// void runtime·memmove(void*, void*, uintptr)
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TEXT runtime·memmove(SB), NOSPLIT, $-8-24
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MOVV to+0(FP), R1
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MOVV from+8(FP), R2
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MOVV n+16(FP), R3
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BNE R3, check
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RET
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check:
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SGTU R1, R2, R4
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BNE R4, backward
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ADDV R1, R3, R6 // end pointer
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// if the two pointers are not of same alignments, do byte copying
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SUBVU R2, R1, R4
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AND $7, R4
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BNE R4, out
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// if less than 8 bytes, do byte copying
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SGTU $8, R3, R4
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BNE R4, out
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// do one byte at a time until 8-aligned
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AND $7, R1, R5
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BEQ R5, words
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MOVB (R2), R4
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ADDV $1, R2
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MOVB R4, (R1)
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ADDV $1, R1
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JMP -6(PC)
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words:
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// do 8 bytes at a time if there is room
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ADDV $-7, R6, R3 // R3 is end pointer-7
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SGTU R3, R1, R5
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BEQ R5, out
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MOVV (R2), R4
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ADDV $8, R2
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MOVV R4, (R1)
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ADDV $8, R1
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JMP -6(PC)
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out:
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BEQ R1, R6, done
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MOVB (R2), R4
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ADDV $1, R2
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MOVB R4, (R1)
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ADDV $1, R1
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JMP -5(PC)
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done:
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RET
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backward:
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ADDV R3, R2 // from-end pointer
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ADDV R1, R3, R6 // to-end pointer
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// if the two pointers are not of same alignments, do byte copying
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SUBVU R6, R2, R4
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AND $7, R4
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BNE R4, out1
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// if less than 8 bytes, do byte copying
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SGTU $8, R3, R4
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BNE R4, out1
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// do one byte at a time until 8-aligned
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AND $7, R6, R5
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BEQ R5, words1
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ADDV $-1, R2
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MOVB (R2), R4
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ADDV $-1, R6
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MOVB R4, (R6)
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JMP -6(PC)
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words1:
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// do 8 bytes at a time if there is room
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ADDV $7, R1, R3 // R3 is start pointer+7
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SGTU R6, R3, R5
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BEQ R5, out1
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ADDV $-8, R2
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MOVV (R2), R4
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ADDV $-8, R6
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MOVV R4, (R6)
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JMP -6(PC)
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out1:
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BEQ R1, R6, done1
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ADDV $-1, R2
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MOVB (R2), R4
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ADDV $-1, R6
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MOVB R4, (R6)
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JMP -5(PC)
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done1:
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RET
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