github.com/primecitizens/pcz/std@v0.2.1/core/mem/move_mips64x.s (about) 1 // SPDX-License-Identifier: Apache-2.0 2 // Copyright 2023 The Prime Citizens 3 // 4 // Copyright 2015 The Go Authors. All rights reserved. 5 // Use of this source code is governed by a BSD-style 6 // license that can be found in the LICENSE file. 7 8 //go:build pcz && (mips64 || mips64le) 9 10 #include "textflag.h" 11 12 // See memmove Go doc for important implementation constraints. 13 14 // func Move(to, from unsafe.Pointer, n uintptr) 15 TEXT ·Move(SB), NOSPLIT|NOFRAME, $0-24 16 MOVV to+0(FP), R1 17 MOVV from+8(FP), R2 18 MOVV n+16(FP), R3 19 BNE R3, check 20 RET 21 22 check: 23 SGTU R1, R2, R4 24 BNE R4, backward 25 26 ADDV R1, R3, R6 // end pointer 27 28 // if the two pointers are not of same alignments, do byte copying 29 SUBVU R2, R1, R4 30 AND $7, R4 31 BNE R4, out 32 33 // if less than 8 bytes, do byte copying 34 SGTU $8, R3, R4 35 BNE R4, out 36 37 // do one byte at a time until 8-aligned 38 AND $7, R1, R5 39 BEQ R5, words 40 MOVB (R2), R4 41 ADDV $1, R2 42 MOVB R4, (R1) 43 ADDV $1, R1 44 JMP -6(PC) 45 46 words: 47 // do 8 bytes at a time if there is room 48 ADDV $-7, R6, R3 // R3 is end pointer-7 49 50 SGTU R3, R1, R5 51 BEQ R5, out 52 MOVV (R2), R4 53 ADDV $8, R2 54 MOVV R4, (R1) 55 ADDV $8, R1 56 JMP -6(PC) 57 58 out: 59 BEQ R1, R6, done 60 MOVB (R2), R4 61 ADDV $1, R2 62 MOVB R4, (R1) 63 ADDV $1, R1 64 JMP -5(PC) 65 done: 66 RET 67 68 backward: 69 ADDV R3, R2 // from-end pointer 70 ADDV R1, R3, R6 // to-end pointer 71 72 // if the two pointers are not of same alignments, do byte copying 73 SUBVU R6, R2, R4 74 AND $7, R4 75 BNE R4, out1 76 77 // if less than 8 bytes, do byte copying 78 SGTU $8, R3, R4 79 BNE R4, out1 80 81 // do one byte at a time until 8-aligned 82 AND $7, R6, R5 83 BEQ R5, words1 84 ADDV $-1, R2 85 MOVB (R2), R4 86 ADDV $-1, R6 87 MOVB R4, (R6) 88 JMP -6(PC) 89 90 words1: 91 // do 8 bytes at a time if there is room 92 ADDV $7, R1, R3 // R3 is start pointer+7 93 94 SGTU R6, R3, R5 95 BEQ R5, out1 96 ADDV $-8, R2 97 MOVV (R2), R4 98 ADDV $-8, R6 99 MOVV R4, (R6) 100 JMP -6(PC) 101 102 out1: 103 BEQ R1, R6, done1 104 ADDV $-1, R2 105 MOVB (R2), R4 106 ADDV $-1, R6 107 MOVB R4, (R6) 108 JMP -5(PC) 109 done1: 110 RET