| // Copyright 2016 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|NOFRAME,$0-16 |
| MOVD ptr+0(FP), R4 |
| MOVD n+8(FP), R5 |
| |
| start: |
| CMPBLE R5, $3, clear0to3 |
| CMPBLE R5, $7, clear4to7 |
| CMPBLE R5, $11, clear8to11 |
| CMPBLE R5, $15, clear12to15 |
| CMP R5, $32 |
| BGE clearmt32 |
| MOVD $0, 0(R4) |
| MOVD $0, 8(R4) |
| ADD $16, R4 |
| SUB $16, R5 |
| BR start |
| |
| clear0to3: |
| CMPBEQ R5, $0, done |
| CMPBNE R5, $1, clear2 |
| MOVB $0, 0(R4) |
| RET |
| clear2: |
| CMPBNE R5, $2, clear3 |
| MOVH $0, 0(R4) |
| RET |
| clear3: |
| MOVH $0, 0(R4) |
| MOVB $0, 2(R4) |
| RET |
| |
| clear4to7: |
| CMPBNE R5, $4, clear5 |
| MOVW $0, 0(R4) |
| RET |
| clear5: |
| CMPBNE R5, $5, clear6 |
| MOVW $0, 0(R4) |
| MOVB $0, 4(R4) |
| RET |
| clear6: |
| CMPBNE R5, $6, clear7 |
| MOVW $0, 0(R4) |
| MOVH $0, 4(R4) |
| RET |
| clear7: |
| MOVW $0, 0(R4) |
| MOVH $0, 4(R4) |
| MOVB $0, 6(R4) |
| RET |
| |
| clear8to11: |
| CMPBNE R5, $8, clear9 |
| MOVD $0, 0(R4) |
| RET |
| clear9: |
| CMPBNE R5, $9, clear10 |
| MOVD $0, 0(R4) |
| MOVB $0, 8(R4) |
| RET |
| clear10: |
| CMPBNE R5, $10, clear11 |
| MOVD $0, 0(R4) |
| MOVH $0, 8(R4) |
| RET |
| clear11: |
| MOVD $0, 0(R4) |
| MOVH $0, 8(R4) |
| MOVB $0, 10(R4) |
| RET |
| |
| clear12to15: |
| CMPBNE R5, $12, clear13 |
| MOVD $0, 0(R4) |
| MOVW $0, 8(R4) |
| RET |
| clear13: |
| CMPBNE R5, $13, clear14 |
| MOVD $0, 0(R4) |
| MOVW $0, 8(R4) |
| MOVB $0, 12(R4) |
| RET |
| clear14: |
| CMPBNE R5, $14, clear15 |
| MOVD $0, 0(R4) |
| MOVW $0, 8(R4) |
| MOVH $0, 12(R4) |
| RET |
| clear15: |
| MOVD $0, 0(R4) |
| MOVW $0, 8(R4) |
| MOVH $0, 12(R4) |
| MOVB $0, 14(R4) |
| RET |
| |
| clearmt32: |
| CMP R5, $256 |
| BLT clearlt256 |
| XC $256, 0(R4), 0(R4) |
| ADD $256, R4 |
| ADD $-256, R5 |
| BR clearmt32 |
| clearlt256: |
| CMPBEQ R5, $0, done |
| ADD $-1, R5 |
| EXRL $memclr_exrl_xc<>(SB), R5 |
| done: |
| RET |
| |
| // DO NOT CALL - target for exrl (execute relative long) instruction. |
| TEXT memclr_exrl_xc<>(SB),NOSPLIT|NOFRAME,$0-0 |
| XC $1, 0(R4), 0(R4) |
| MOVD $0, 0(R0) |
| RET |
| |
