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| // Inferno's libkern/memset-arm.s
| // https://bitbucket.org/inferno-os/inferno-os/src/default/libkern/memset-arm.s
| //
| // Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
| // Revisions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com). All rights reserved.
| // Portions Copyright 2009 The Go Authors. All rights reserved.
| //
| // Permission is hereby granted, free of charge, to any person obtaining a copy
| // of this software and associated documentation files (the "Software"), to deal
| // in the Software without restriction, including without limitation the rights
| // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
| // copies of the Software, and to permit persons to whom the Software is
| // furnished to do so, subject to the following conditions:
| //
| // The above copyright notice and this permission notice shall be included in
| // all copies or substantial portions of the Software.
| //
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
| // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
| // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
| // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
| // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
| // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
| // THE SOFTWARE.
|
| #include "textflag.h"
|
| #define TO R8
| #define TOE R11
| #define N R12
| #define TMP R12 /* N and TMP don't overlap */
|
| // func memclrNoHeapPointers(ptr unsafe.Pointer, n uintptr)
| TEXT runtime·memclrNoHeapPointers(SB),NOSPLIT,$0-8
| MOVW ptr+0(FP), TO
| MOVW n+4(FP), N
| MOVW $0, R0
|
| ADD N, TO, TOE /* to end pointer */
|
| CMP $4, N /* need at least 4 bytes to copy */
| BLT _1tail
|
| _4align: /* align on 4 */
| AND.S $3, TO, TMP
| BEQ _4aligned
|
| MOVBU.P R0, 1(TO) /* implicit write back */
| B _4align
|
| _4aligned:
| SUB $31, TOE, TMP /* do 32-byte chunks if possible */
| CMP TMP, TO
| BHS _4tail
|
| MOVW R0, R1 /* replicate */
| MOVW R0, R2
| MOVW R0, R3
| MOVW R0, R4
| MOVW R0, R5
| MOVW R0, R6
| MOVW R0, R7
|
| _f32loop:
| CMP TMP, TO
| BHS _4tail
|
| MOVM.IA.W [R0-R7], (TO)
| B _f32loop
|
| _4tail:
| SUB $3, TOE, TMP /* do remaining words if possible */
| _4loop:
| CMP TMP, TO
| BHS _1tail
|
| MOVW.P R0, 4(TO) /* implicit write back */
| B _4loop
|
| _1tail:
| CMP TO, TOE
| BEQ _return
|
| MOVBU.P R0, 1(TO) /* implicit write back */
| B _1tail
|
| _return:
| RET
|
|
