| Vladimir Stefanovic | 272032d | 2016-10-18 23:51:01 +0200 | [diff] [blame] | 1 | // Copyright 2016 The Go Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style |
| 3 | // license that can be found in the LICENSE file. |
| 4 | |
| 5 | // +build mips mipsle |
| 6 | |
| 7 | #include "textflag.h" |
| 8 | |
| 9 | #ifdef GOARCH_mips |
| 10 | #define MOVWHI MOVWL |
| 11 | #define MOVWLO MOVWR |
| 12 | #else |
| 13 | #define MOVWHI MOVWR |
| 14 | #define MOVWLO MOVWL |
| 15 | #endif |
| 16 | |
| 17 | // void runtime·memclrNoHeapPointers(void*, uintptr) |
| 18 | TEXT runtime·memclrNoHeapPointers(SB),NOSPLIT,$0-8 |
| 19 | MOVW n+4(FP), R2 |
| 20 | MOVW ptr+0(FP), R1 |
| 21 | |
| 22 | SGTU $4, R2, R3 |
| 23 | ADDU R2, R1, R4 |
| 24 | BNE R3, small_zero |
| 25 | |
| 26 | ptr_align: |
| 27 | AND $3, R1, R3 |
| 28 | BEQ R3, setup |
| 29 | SUBU R1, R0, R3 |
| 30 | AND $3, R3 // R3 contains number of bytes needed to align ptr |
| 31 | MOVWHI R0, 0(R1) // MOVWHI will write zeros up to next word boundary |
| 32 | SUBU R3, R2 |
| 33 | ADDU R3, R1 |
| 34 | |
| 35 | setup: |
| 36 | AND $31, R2, R6 |
| 37 | AND $3, R2, R5 |
| 38 | SUBU R6, R4, R6 // end pointer for 32-byte chunks |
| 39 | SUBU R5, R4, R5 // end pointer for 4-byte chunks |
| 40 | |
| 41 | large: |
| 42 | BEQ R1, R6, words |
| 43 | MOVW R0, 0(R1) |
| 44 | MOVW R0, 4(R1) |
| 45 | MOVW R0, 8(R1) |
| 46 | MOVW R0, 12(R1) |
| 47 | MOVW R0, 16(R1) |
| 48 | MOVW R0, 20(R1) |
| 49 | MOVW R0, 24(R1) |
| 50 | MOVW R0, 28(R1) |
| 51 | ADDU $32, R1 |
| 52 | JMP large |
| 53 | |
| 54 | words: |
| 55 | BEQ R1, R5, tail |
| 56 | MOVW R0, 0(R1) |
| 57 | ADDU $4, R1 |
| 58 | JMP words |
| 59 | |
| 60 | tail: |
| 61 | BEQ R1, R4, ret |
| 62 | MOVWLO R0, -1(R4) |
| 63 | |
| 64 | ret: |
| 65 | RET |
| 66 | |
| 67 | small_zero: |
| 68 | BEQ R1, R4, ret |
| 69 | MOVB R0, 0(R1) |
| 70 | ADDU $1, R1 |
| 71 | JMP small_zero |
