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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-16 19:23:18 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-16 19:23:18 +0000 |
| commit | 43a123c1ae6613b3efeed291fa552ecd909d3acf (patch) | |
| tree | fd92518b7024bc74031f78a1cf9e454b65e73665 /src/runtime/memclr_plan9_386.s | |
| parent | Initial commit. (diff) | |
| download | golang-1.20-43a123c1ae6613b3efeed291fa552ecd909d3acf.tar.xz golang-1.20-43a123c1ae6613b3efeed291fa552ecd909d3acf.zip | |
Adding upstream version 1.20.14.upstream/1.20.14upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/runtime/memclr_plan9_386.s')
| -rw-r--r-- | src/runtime/memclr_plan9_386.s | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/src/runtime/memclr_plan9_386.s b/src/runtime/memclr_plan9_386.s new file mode 100644 index 0000000..54701a9 --- /dev/null +++ b/src/runtime/memclr_plan9_386.s @@ -0,0 +1,58 @@ +// Copyright 2014 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 memclrNoHeapPointers Go doc for important implementation constraints. + +// func memclrNoHeapPointers(ptr unsafe.Pointer, n uintptr) +TEXT runtime·memclrNoHeapPointers(SB), NOSPLIT, $0-8 + MOVL ptr+0(FP), DI + MOVL n+4(FP), BX + XORL AX, AX + +tail: + TESTL BX, BX + JEQ _0 + CMPL BX, $2 + JBE _1or2 + CMPL BX, $4 + JB _3 + JE _4 + CMPL BX, $8 + JBE _5through8 + CMPL BX, $16 + JBE _9through16 + MOVL BX, CX + SHRL $2, CX + REP + STOSL + ANDL $3, BX + JNE tail + RET + +_1or2: + MOVB AX, (DI) + MOVB AX, -1(DI)(BX*1) + RET +_0: + RET +_3: + MOVW AX, (DI) + MOVB AX, 2(DI) + RET +_4: + // We need a separate case for 4 to make sure we clear pointers atomically. + MOVL AX, (DI) + RET +_5through8: + MOVL AX, (DI) + MOVL AX, -4(DI)(BX*1) + RET +_9through16: + MOVL AX, (DI) + MOVL AX, 4(DI) + MOVL AX, -8(DI)(BX*1) + MOVL AX, -4(DI)(BX*1) + RET |