| // Copyright 2009 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" |
| |
| // func memclrNoHeapPointers(ptr unsafe.Pointer, n uintptr) |
| TEXT runtime·memclrNoHeapPointers(SB),NOSPLIT,$0-8 |
| MOVL ptr+0(FP), DI |
| MOVL n+4(FP), CX |
| MOVQ CX, BX |
| ANDQ $3, BX |
| SHRQ $2, CX |
| MOVQ $0, AX |
| CLD |
| REP |
| STOSL |
| MOVQ BX, CX |
| REP |
| STOSB |
| // Note: we zero only 4 bytes at a time so that the tail is at most |
| // 3 bytes. That guarantees that we aren't zeroing pointers with STOSB. |
| // See issue 13160. |
| RET |
