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// Copyright 2013 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 <u.h>
#include "cc.h"
enum {
WORDSIZE = sizeof(uint32),
WORDBITS = 32,
};
uintptr
bvsize(uintptr n)
{
return ((n + WORDBITS - 1) / WORDBITS) * WORDSIZE;
}
Bvec*
bvalloc(int32 n)
{
Bvec *bv;
uintptr nbytes;
if(n < 0)
fatal(Z, "bvalloc: initial size is negative\n");
nbytes = sizeof(Bvec) + bvsize(n);
bv = malloc(nbytes);
if(bv == nil)
fatal(Z, "bvalloc: malloc failed\n");
memset(bv, 0, nbytes);
bv->n = n;
return bv;
}
void
bvset(Bvec *bv, int32 i)
{
uint32 mask;
if(i < 0 || i >= bv->n)
fatal(Z, "bvset: index %d is out of bounds with length %d\n", i, bv->n);
mask = 1 << (i % WORDBITS);
bv->b[i / WORDBITS] |= mask;
}
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