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https://github.com/KhronosGroup/SPIRV-Tools
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3335c61147
* Fix #2320. `conditional_branch_to_simple_conditional_branch` reduction pass changes conditional branches so both targets point to the same block id (creating a "simple" conditional branch). * Fix #2501. `simple_conditional_branch_to_branch` reduction pass changes "simple" conditional branches to branches. * Fix #2503. `conditional_branch_to_simple_conditional_branch` proper handling of back-edges.
49 lines
1.5 KiB
C++
49 lines
1.5 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 "source/reduce/reduction_util.h"
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#include "source/opt/ir_context.h"
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namespace spvtools {
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namespace reduce {
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using opt::IRContext;
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using opt::Instruction;
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const uint32_t kTrueBranchOperandIndex = 1;
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const uint32_t kFalseBranchOperandIndex = 2;
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uint32_t FindOrCreateGlobalUndef(IRContext* context, uint32_t type_id) {
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for (auto& inst : context->module()->types_values()) {
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if (inst.opcode() != SpvOpUndef) {
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continue;
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}
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if (inst.type_id() == type_id) {
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return inst.result_id();
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}
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}
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// TODO(2182): this is adapted from MemPass::Type2Undef. In due course it
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// would be good to factor out this duplication.
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const uint32_t undef_id = context->TakeNextId();
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std::unique_ptr<Instruction> undef_inst(
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new Instruction(context, SpvOpUndef, type_id, undef_id, {}));
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assert(undef_id == undef_inst->result_id());
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context->module()->AddGlobalValue(std::move(undef_inst));
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return undef_id;
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}
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} // namespace reduce
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} // namespace spvtools
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