1 // Copyright 2015 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 mips64 mips64le 6 7 #include "textflag.h" 8 9 // void runtimememmove(void*, void*, uintptr) 10 TEXT runtimememmove(SB), NOSPLIT, $-8-24 11 MOVV to+0(FP), R1 12 MOVV from+8(FP), R2 13 MOVV n+16(FP), R3 14 BNE R3, check 15 RET 16 17 check: 18 SGTU R1, R2, R4 19 BNE R4, backward 20 21 ADDV R1, R3, R6 // end pointer 22 23 // if the two pointers are not of same alignments, do byte copying 24 SUBVU R2, R1, R4 25 AND $7, R4 26 BNE R4, out 27 28 // if less than 8 bytes, do byte copying 29 SGTU $8, R3, R4 30 BNE R4, out 31 32 // do one byte at a time until 8-aligned 33 AND $7, R1, R5 34 BEQ R5, words 35 MOVB (R2), R4 36 ADDV $1, R2 37 MOVB R4, (R1) 38 ADDV $1, R1 39 JMP -6(PC) 40 41 words: 42 // do 8 bytes at a time if there is room 43 ADDV $-7, R6, R3 // R3 is end pointer-7 44 45 SGTU R3, R1, R5 46 BEQ R5, out 47 MOVV (R2), R4 48 ADDV $8, R2 49 MOVV R4, (R1) 50 ADDV $8, R1 51 JMP -6(PC) 52 53 out: 54 BEQ R1, R6, done 55 MOVB (R2), R4 56 ADDV $1, R2 57 MOVB R4, (R1) 58 ADDV $1, R1 59 JMP -5(PC) 60 done: 61 RET 62 63 backward: 64 ADDV R3, R2 // from-end pointer 65 ADDV R1, R3, R6 // to-end pointer 66 67 // if the two pointers are not of same alignments, do byte copying 68 SUBVU R6, R2, R4 69 AND $7, R4 70 BNE R4, out1 71 72 // if less than 8 bytes, do byte copying 73 SGTU $8, R3, R4 74 BNE R4, out1 75 76 // do one byte at a time until 8-aligned 77 AND $7, R6, R5 78 BEQ R5, words1 79 ADDV $-1, R2 80 MOVB (R2), R4 81 ADDV $-1, R6 82 MOVB R4, (R6) 83 JMP -6(PC) 84 85 words1: 86 // do 8 bytes at a time if there is room 87 ADDV $7, R1, R3 // R3 is start pointer+7 88 89 SGTU R6, R3, R5 90 BEQ R5, out1 91 ADDV $-8, R2 92 MOVV (R2), R4 93 ADDV $-8, R6 94 MOVV R4, (R6) 95 JMP -6(PC) 96 97 out1: 98 BEQ R1, R6, done1 99 ADDV $-1, R2 100 MOVB (R2), R4 101 ADDV $-1, R6 102 MOVB R4, (R6) 103 JMP -5(PC) 104 done1: 105 RET 106
