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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "jit/BitSet.h"
using namespace js;
using namespace js::jit;
bool
BitSet::init(TempAllocator& alloc)
{
size_t sizeRequired = numWords() * sizeof(*bits_);
bits_ = (uint32_t*)alloc.allocate(sizeRequired);
if (!bits_)
return false;
memset(bits_, 0, sizeRequired);
return true;
}
bool
BitSet::empty() const
{
MOZ_ASSERT(bits_);
const uint32_t* bits = bits_;
for (unsigned int i = 0, e = numWords(); i < e; i++) {
if (bits[i])
return false;
}
return true;
}
void
BitSet::insertAll(const BitSet& other)
{
MOZ_ASSERT(bits_);
MOZ_ASSERT(other.numBits_ == numBits_);
MOZ_ASSERT(other.bits_);
uint32_t* bits = bits_;
const uint32_t* otherBits = other.bits_;
for (unsigned int i = 0, e = numWords(); i < e; i++)
bits[i] |= otherBits[i];
}
void
BitSet::removeAll(const BitSet& other)
{
MOZ_ASSERT(bits_);
MOZ_ASSERT(other.numBits_ == numBits_);
MOZ_ASSERT(other.bits_);
uint32_t* bits = bits_;
const uint32_t* otherBits = other.bits_;
for (unsigned int i = 0, e = numWords(); i < e; i++)
bits[i] &= ~otherBits[i];
}
void
BitSet::intersect(const BitSet& other)
{
MOZ_ASSERT(bits_);
MOZ_ASSERT(other.numBits_ == numBits_);
MOZ_ASSERT(other.bits_);
uint32_t* bits = bits_;
const uint32_t* otherBits = other.bits_;
for (unsigned int i = 0, e = numWords(); i < e; i++)
bits[i] &= otherBits[i];
}
// returns true if the intersection caused the contents of the set to change.
bool
BitSet::fixedPointIntersect(const BitSet& other)
{
MOZ_ASSERT(bits_);
MOZ_ASSERT(other.numBits_ == numBits_);
MOZ_ASSERT(other.bits_);
bool changed = false;
uint32_t* bits = bits_;
const uint32_t* otherBits = other.bits_;
for (unsigned int i = 0, e = numWords(); i < e; i++) {
uint32_t old = bits[i];
bits[i] &= otherBits[i];
if (!changed && old != bits[i])
changed = true;
}
return changed;
}
void
BitSet::complement()
{
MOZ_ASSERT(bits_);
uint32_t* bits = bits_;
for (unsigned int i = 0, e = numWords(); i < e; i++)
bits[i] = ~bits[i];
}
void
BitSet::clear()
{
MOZ_ASSERT(bits_);
uint32_t* bits = bits_;
for (unsigned int i = 0, e = numWords(); i < e; i++)
bits[i] = 0;
}
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