mirror of
https://github.com/golang/go
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07826038c3
Partially fixes issue 3718. R=golang-dev, rsc, minux.ma CC=golang-dev https://golang.org/cl/6300043
92 lines
2.5 KiB
ArmAsm
92 lines
2.5 KiB
ArmAsm
// Inferno's libkern/memset-arm.s
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// http://code.google.com/p/inferno-os/source/browse/libkern/memset-arm.s
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//
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// Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
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// Revisions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com). All rights reserved.
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// Portions Copyright 2009 The Go Authors. All rights reserved.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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TO = 8
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TOE = 11
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N = 12
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TMP = 12 /* N and TMP don't overlap */
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TEXT runtime·memset(SB), $0
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MOVW R0, R(TO)
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MOVW data+4(FP), R(0)
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MOVW n+8(FP), R(N)
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ADD R(N), R(TO), R(TOE) /* to end pointer */
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CMP $4, R(N) /* need at least 4 bytes to copy */
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BLT _1tail
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AND $0xFF, R(0) /* it's a byte */
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SLL $8, R(0), R(TMP) /* replicate to a word */
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ORR R(TMP), R(0)
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SLL $16, R(0), R(TMP)
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ORR R(TMP), R(0)
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_4align: /* align on 4 */
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AND.S $3, R(TO), R(TMP)
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BEQ _4aligned
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MOVBU.P R(0), 1(R(TO)) /* implicit write back */
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B _4align
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_4aligned:
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SUB $31, R(TOE), R(TMP) /* do 32-byte chunks if possible */
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CMP R(TMP), R(TO)
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BHS _4tail
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MOVW R0, R1 /* replicate */
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MOVW R0, R2
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MOVW R0, R3
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MOVW R0, R4
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MOVW R0, R5
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MOVW R0, R6
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MOVW R0, R7
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_f32loop:
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CMP R(TMP), R(TO)
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BHS _4tail
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MOVM.IA.W [R0-R7], (R(TO))
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B _f32loop
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_4tail:
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SUB $3, R(TOE), R(TMP) /* do remaining words if possible */
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_4loop:
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CMP R(TMP), R(TO)
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BHS _1tail
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MOVW.P R(0), 4(R(TO)) /* implicit write back */
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B _4loop
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_1tail:
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CMP R(TO), R(TOE)
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BEQ _return
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MOVBU.P R(0), 1(R(TO)) /* implicit write back */
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B _1tail
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_return:
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RET
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