| // 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 "../../cmd/ld/textflag.h" |
| |
| // void runtime·memclr(void*, uintptr) |
| TEXT runtime·memclr(SB), NOSPLIT, $0-16 |
| MOVQ ptr+0(FP), DI |
| MOVQ n+8(FP), BX |
| XORQ AX, AX |
| |
| clr_tail: |
| TESTQ BX, BX |
| JEQ clr_0 |
| CMPQ BX, $2 |
| JBE clr_1or2 |
| CMPQ BX, $4 |
| JBE clr_3or4 |
| CMPQ BX, $8 |
| JBE clr_5through8 |
| CMPQ BX, $16 |
| JBE clr_9through16 |
| MOVQ BX, CX |
| SHRQ $2, CX |
| REP |
| STOSQ |
| ANDQ $3, BX |
| JNE clr_tail |
| RET |
| |
| clr_1or2: |
| MOVB AX, (DI) |
| MOVB AX, -1(DI)(BX*1) |
| clr_0: |
| RET |
| clr_3or4: |
| MOVW AX, (DI) |
| MOVW AX, -2(DI)(BX*1) |
| RET |
| clr_5through8: |
| MOVL AX, (DI) |
| MOVL AX, -4(DI)(BX*1) |
| RET |
| clr_9through16: |
| MOVQ AX, (DI) |
| MOVQ AX, -8(DI)(BX*1) |
| RET |
