mirror of
https://github.com/KhronosGroup/SPIRV-Tools
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2c0ce87210
Introduce a pass that does a DCE type analysis for vector elements instead of the whole vector as a single element. It will then rewrite instructions that are not used with something else. For example, an instruction whose value are not used, even though it is referenced, is replaced with an OpUndef.
83 lines
2.0 KiB
C++
83 lines
2.0 KiB
C++
// Copyright (c) 2018 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "bit_vector.h"
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#include <cassert>
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#include <iostream>
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namespace spvtools {
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namespace utils {
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void BitVector::ReportDensity(std::ostream& out) {
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uint32_t count = 0;
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for (BitContainer e : bits_) {
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while (e != 0) {
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if ((e & 1) != 0) {
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++count;
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}
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e = e >> 1;
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}
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}
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out << "count=" << count
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<< ", total size (bytes)=" << bits_.size() * sizeof(BitContainer)
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<< ", bytes per element="
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<< (double)(bits_.size() * sizeof(BitContainer)) / (double)(count);
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}
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bool BitVector::Or(const BitVector& other) {
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auto this_it = this->bits_.begin();
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auto other_it = other.bits_.begin();
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bool modified = false;
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while (this_it != this->bits_.end() && other_it != other.bits_.end()) {
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auto temp = *this_it | *other_it;
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if (temp != *this_it) {
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modified = true;
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*this_it = temp;
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}
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++this_it;
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++other_it;
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}
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if (other_it != other.bits_.end()) {
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modified = true;
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this->bits_.insert(this->bits_.end(), other_it, other.bits_.end());
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}
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return modified;
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}
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std::ostream& operator<<(std::ostream& out, const BitVector& bv) {
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out << "{";
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for (uint32_t i = 0; i < bv.bits_.size(); ++i) {
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BitVector::BitContainer b = bv.bits_[i];
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uint32_t j = 0;
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while (b != 0) {
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if (b & 1) {
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out << ' ' << i * BitVector::kBitContainerSize + j;
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}
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++j;
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b = b >> 1;
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}
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}
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out << "}";
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return out;
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}
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} // namespace utils
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} // namespace spvtools
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