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//===-- AMDGPUGlobalISelDivergenceLowering.cpp ----------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
/// \file
/// GlobalISel pass that selects divergent i1 phis as lane mask phis.
/// Lane mask merging uses same algorithm as SDAG in SILowerI1Copies.
/// Handles all cases of temporal divergence.
/// For divergent non-phi i1 and uniform i1 uses outside of the cycle this pass
/// currently depends on LCSSA to insert phis with one incoming.
//
//===----------------------------------------------------------------------===//
#include "AMDGPU.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#define DEBUG_TYPE "amdgpu-global-isel-divergence-lowering"
using namespace llvm;
namespace {
class AMDGPUGlobalISelDivergenceLowering : public MachineFunctionPass {
public:
static char ID;
public:
AMDGPUGlobalISelDivergenceLowering() : MachineFunctionPass(ID) {
initializeAMDGPUGlobalISelDivergenceLoweringPass(
*PassRegistry::getPassRegistry());
}
bool runOnMachineFunction(MachineFunction &MF) override;
StringRef getPassName() const override {
return "AMDGPU GlobalISel divergence lowering";
}
void getAnalysisUsage(AnalysisUsage &AU) const override {
AU.setPreservesCFG();
MachineFunctionPass::getAnalysisUsage(AU);
}
};
} // End anonymous namespace.
INITIALIZE_PASS_BEGIN(AMDGPUGlobalISelDivergenceLowering, DEBUG_TYPE,
"AMDGPU GlobalISel divergence lowering", false, false)
INITIALIZE_PASS_END(AMDGPUGlobalISelDivergenceLowering, DEBUG_TYPE,
"AMDGPU GlobalISel divergence lowering", false, false)
char AMDGPUGlobalISelDivergenceLowering::ID = 0;
char &llvm::AMDGPUGlobalISelDivergenceLoweringID =
AMDGPUGlobalISelDivergenceLowering::ID;
FunctionPass *llvm::createAMDGPUGlobalISelDivergenceLoweringPass() {
return new AMDGPUGlobalISelDivergenceLowering();
}
bool AMDGPUGlobalISelDivergenceLowering::runOnMachineFunction(
MachineFunction &MF) {
return false;
}
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