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34d4294c2c
We have come across a driver bug where and OpUnreachable inside a loop is causing the shader to go into an infinite loop. This commit will try to avoid this bug by turning OpUnreachable instructions that are contained in a loop into branches to the loop merge block. This is not added to "-O" and "-Os" because it should only be used if the driver being targeted has this problem. Fixes #1209.
42 lines
1.3 KiB
C++
42 lines
1.3 KiB
C++
// Copyright (c) 2018 Google Inc.
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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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#ifndef LIBSPIRV_OPT_WORKAROUND1209_H_
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#define LIBSPIRV_OPT_WORKAROUND1209_H_
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#include "pass.h"
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namespace spvtools {
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namespace opt {
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// See optimizer.hpp for documentation.
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class Workaround1209 : public Pass {
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public:
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const char* name() const override { return "workaround-1209"; }
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Status Process(ir::IRContext*) override;
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private:
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// There is at least one driver where an OpUnreachable found in a loop is not
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// handled correctly. Workaround that by changing the OpUnreachable into a
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// branch to the loop merge.
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//
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// Returns true if the code changed.
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bool RemoveOpUnreachableInLoops();
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};
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} // namespace opt
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} // namespace spvtools
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#endif // LIBSPIRV_OPT_WORKAROUND1209_H_
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