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memclr_plan9_386.s
// Copyright 2014 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, $0-8 MOVL ptr+0(FP), DI MOVL n+4(FP), BX XORL AX, AX tail: TESTL BX, BX JEQ _0 CMPL BX, $2 JBE _1or2 CMPL BX, $4 JB _3 JE _4 CMPL BX, $8 JBE _5through8 CMPL BX, $16 JBE _9through16 MOVL BX, CX SHRL $2, CX REP STOSL ANDL $3, BX JNE tail RET _1or2: MOVB AX, (DI) MOVB AX, -1(DI)(BX*1) RET _0: RET _3: MOVW AX, (DI) MOVB AX, 2(DI) RET _4: // We need a separate case for 4 to make sure we clear pointers atomically. MOVL AX, (DI) RET _5through8: MOVL AX, (DI) MOVL AX, -4(DI)(BX*1) RET _9through16: MOVL AX, (DI) MOVL AX, 4(DI) MOVL AX, -8(DI)(BX*1) MOVL AX, -4(DI)(BX*1) RET
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