1 // Copyright 2014 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 #include "textflag.h" 6 7 // void runtimememclr(void*, uintptr) 8 TEXT runtimememclr(SB), NOSPLIT, $0-8 9 MOVL ptr+0(FP), DI 10 MOVL n+4(FP), BX 11 XORL AX, AX 12 13 tail: 14 TESTL BX, BX 15 JEQ _0 16 CMPL BX, $2 17 JBE _1or2 18 CMPL BX, $4 19 JBE _3or4 20 CMPL BX, $8 21 JBE _5through8 22 CMPL BX, $16 23 JBE _9through16 24 MOVL BX, CX 25 SHRL $2, CX 26 REP 27 STOSL 28 ANDL $3, BX 29 JNE tail 30 RET 31 32 _1or2: 33 MOVB AX, (DI) 34 MOVB AX, -1(DI)(BX*1) 35 RET 36 _0: 37 RET 38 _3or4: 39 MOVW AX, (DI) 40 MOVW AX, -2(DI)(BX*1) 41 RET 42 _5through8: 43 MOVL AX, (DI) 44 MOVL AX, -4(DI)(BX*1) 45 RET 46 _9through16: 47 MOVL AX, (DI) 48 MOVL AX, 4(DI) 49 MOVL AX, -8(DI)(BX*1) 50 MOVL AX, -4(DI)(BX*1) 51 RET 52
