b48e7c2d01
Meanwhile, use UniformityAnalysis instead of LegacyDivergenceAnalysis to collect divergence info. Reviewed By: arsenm, sameerds Differential Revision: https://reviews.llvm.org/D141355
32 lines
1.3 KiB
C++
32 lines
1.3 KiB
C++
//===- AMDGPUUnifyDivergentExitNodes.h ------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This is a variant of the UnifyFunctionExitNodes pass. Rather than ensuring
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// there is at most one ret and one unreachable instruction, it ensures there is
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// at most one divergent exiting block.
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//
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// StructurizeCFG can't deal with multi-exit regions formed by branches to
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// multiple return nodes. It is not desirable to structurize regions with
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// uniform branches, so unifying those to the same return block as divergent
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// branches inhibits use of scalar branching. It still can't deal with the case
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// where one branch goes to return, and one unreachable. Replace unreachable in
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// this case with a return.
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//
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//===----------------------------------------------------------------------===//
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#include "AMDGPU.h"
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namespace llvm {
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class AMDGPUUnifyDivergentExitNodesPass
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: public PassInfoMixin<AMDGPUUnifyDivergentExitNodesPass> {
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public:
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PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
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};
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} // end namespace llvm
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