[llvm][AMDGPU] Fold llvm.amdgcn.wavefrontsize early
#114481
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,59 @@ | ||
| //===- AMDGPUExpandPseudoIntrinsics.cpp - Pseudo Intrinsic Expander Pass --===// | ||
| // | ||
| // 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 file implements a pass that deals with expanding AMDGCN generic pseudo- | ||
| // intrinsics into target specific quantities / sequences. In this context, a | ||
| // pseudo-intrinsic is an AMDGCN intrinsic that does not directly map to a | ||
| // specific instruction, but rather is intended as a mechanism for abstractly | ||
| // conveying target specific info to a HLL / the FE, without concretely | ||
| // impacting the AST. An example of such an intrinsic is amdgcn.wavefrontsize. | ||
| // This pass should run as early as possible / immediately after Clang CodeGen, | ||
| // so that the optimisation pipeline and the BE operate with concrete target | ||
| // data. | ||
| //===----------------------------------------------------------------------===// | ||
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| #include "AMDGPU.h" | ||
| #include "AMDGPUTargetMachine.h" | ||
| #include "GCNSubtarget.h" | ||
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| #include "llvm/IR/Constants.h" | ||
| #include "llvm/IR/Function.h" | ||
| #include "llvm/IR/IntrinsicsAMDGPU.h" | ||
| #include "llvm/IR/Module.h" | ||
| #include "llvm/Pass.h" | ||
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| using namespace llvm; | ||
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| static inline PreservedAnalyses expandWaveSizeIntrinsic(const GCNSubtarget &ST, | ||
| Function *WaveSize) { | ||
| if (WaveSize->hasZeroLiveUses()) | ||
| return PreservedAnalyses::all(); | ||
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| for (auto &&U : WaveSize->users()) | ||
| U->replaceAllUsesWith( | ||
| ConstantInt::get(WaveSize->getReturnType(), ST.getWavefrontSize())); | ||
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| return PreservedAnalyses::none(); | ||
| } | ||
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| PreservedAnalyses | ||
| AMDGPUExpandPseudoIntrinsicsPass::run(Module &M, ModuleAnalysisManager &) { | ||
| if (M.empty()) | ||
| return PreservedAnalyses::all(); | ||
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| const auto &ST = TM.getSubtarget<GCNSubtarget>(*M.begin()); | ||
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| // This is not a concrete target, we should not fold early. | ||
| if (ST.getCPU().empty() || ST.getCPU() == "generic") | ||
| return PreservedAnalyses::all(); | ||
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| if (auto WS = Intrinsic::getDeclarationIfExists( | ||
| &M, Intrinsic::amdgcn_wavefrontsize)) | ||
| return expandWaveSizeIntrinsic(ST, WS); | ||
|
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| return PreservedAnalyses::all(); | ||
| } |
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The pass isn't needed now?