| // Copyright 2022 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 "go_asm.h" |
| #include "textflag.h" |
| |
| // func memclrNoHeapPointers(ptr unsafe.Pointer, n uintptr) |
| TEXT runtime·memclrNoHeapPointers(SB),NOSPLIT,$0-16 |
| MOVV ptr+0(FP), R6 |
| MOVV n+8(FP), R7 |
| ADDV R6, R7, R4 |
| |
| // if less than 8 bytes, do one byte at a time |
| SGTU $8, R7, R8 |
| BNE R8, out |
| |
| // do one byte at a time until 8-aligned |
| AND $7, R6, R8 |
| BEQ R8, words |
| MOVB R0, (R6) |
| ADDV $1, R6 |
| JMP -4(PC) |
| |
| words: |
| // do 8 bytes at a time if there is room |
| ADDV $-7, R4, R7 |
| |
| SGTU R7, R6, R8 |
| BEQ R8, out |
| MOVV R0, (R6) |
| ADDV $8, R6 |
| JMP -4(PC) |
| |
| out: |
| BEQ R6, R4, done |
| MOVB R0, (R6) |
| ADDV $1, R6 |
| JMP -3(PC) |
| done: |
| RET |
