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