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/* go-memclr.c -- clear a memory buffer
Copyright 2016 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 "runtime.h"
void memclrNoHeapPointers(void *, uintptr)
__asm__ (GOSYM_PREFIX "runtime.memclrNoHeapPointers")
__attribute__ ((no_split_stack));
void
memclrNoHeapPointers(void *p1, uintptr len)
{
const uintptr ptr_size = sizeof(p1);
uintptr rem,drem,i;
uintptr offset;
volatile uintptr *vp;
if (len == 0) {
return;
}
rem = len;
offset = (uintptr)p1 % ptr_size;
if (rem < ptr_size || offset > 0) {
// This memset is OK since it can't contain
// an pointer aligned pointer.
__builtin_memset(p1, 0, rem);
return;
}
drem = rem / ptr_size;
vp = (volatile uintptr*)(p1);
// Without the use of volatile here, the compiler
// might convert the loop into a memset.
for (i=0; i<drem; i++) {
*vp = 0;
vp++;
rem -= ptr_size;
}
// Clear any remaining bytes.
if (rem > 0) {
p1 = (void*)((char*)p1 + ptr_size*drem);
__builtin_memset(p1, 0, rem);
}
}
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