de1a97db39
This change implements lowering for #70076, #70100, #70072, & #70102 `CGBuiltin.cpp` - - simplify `lerp` intrinsic `IntrinsicsDirectX.td` - simplify `lerp` intrinsic `SemaChecking.cpp` - remove unnecessary check `DXILIntrinsicExpansion.*` - add intrinsic to instruction expansion cases `DXILOpLowering.cpp` - make sure `DXILIntrinsicExpansion` happens first `DirectX.h` - changes to support new pass `DirectXTargetMachine.cpp` - changes to support new pass Why `any`, and `lerp` as instruction expansion just for DXIL? - SPIR-V there is an [OpAny](https://registry.khronos.org/SPIR-V/specs/unified1/SPIRV.html#OpAny) - SPIR-V has a GLSL lerp extension via [Fmix](https://registry.khronos.org/SPIR-V/specs/1.0/GLSL.std.450.html#FMix) Why `exp` instruction expansion? - We have an `exp2` opcode and `exp` reuses that opcode. So instruction expansion is a convenient way to do preprocessing. - Further SPIR-V has a GLSL exp extension via [Exp](https://registry.khronos.org/SPIR-V/specs/1.0/GLSL.std.450.html#Exp) and [Exp2](https://registry.khronos.org/SPIR-V/specs/1.0/GLSL.std.450.html#Exp2) Why `rcp` as instruction expansion? This one is a bit of the odd man out and might have to move to `cgbuiltins` when we better understand SPIRV requirements. However I included it because it seems like [fast math mode has an AllowRecip flag](https://registry.khronos.org/SPIR-V/specs/unified1/SPIRV.html#_fp_fast_math_mode) which lets you compute the reciprocal without performing the division. We don't have that in DXIL so thought to include it.
114 lines
3.5 KiB
C++
114 lines
3.5 KiB
C++
//===- DXILOpLower.cpp - Lowering LLVM intrinsic to DIXLOp function -------===//
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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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/// \file This file contains passes and utilities to lower llvm intrinsic call
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/// to DXILOp function call.
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//===----------------------------------------------------------------------===//
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#include "DXILConstants.h"
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#include "DXILIntrinsicExpansion.h"
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#include "DXILOpBuilder.h"
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#include "DirectX.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/CodeGen/Passes.h"
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#include "llvm/IR/IRBuilder.h"
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#include "llvm/IR/Instruction.h"
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#include "llvm/IR/Intrinsics.h"
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#include "llvm/IR/IntrinsicsDirectX.h"
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#include "llvm/IR/Module.h"
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#include "llvm/IR/PassManager.h"
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#include "llvm/Pass.h"
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#include "llvm/Support/ErrorHandling.h"
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#define DEBUG_TYPE "dxil-op-lower"
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using namespace llvm;
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using namespace llvm::dxil;
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static void lowerIntrinsic(dxil::OpCode DXILOp, Function &F, Module &M) {
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IRBuilder<> B(M.getContext());
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Value *DXILOpArg = B.getInt32(static_cast<unsigned>(DXILOp));
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DXILOpBuilder DXILB(M, B);
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Type *OverloadTy = DXILB.getOverloadTy(DXILOp, F.getFunctionType());
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for (User *U : make_early_inc_range(F.users())) {
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CallInst *CI = dyn_cast<CallInst>(U);
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if (!CI)
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continue;
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SmallVector<Value *> Args;
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Args.emplace_back(DXILOpArg);
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Args.append(CI->arg_begin(), CI->arg_end());
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B.SetInsertPoint(CI);
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CallInst *DXILCI = DXILB.createDXILOpCall(DXILOp, OverloadTy, CI->args());
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CI->replaceAllUsesWith(DXILCI);
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CI->eraseFromParent();
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}
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if (F.user_empty())
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F.eraseFromParent();
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}
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static bool lowerIntrinsics(Module &M) {
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bool Updated = false;
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#define DXIL_OP_INTRINSIC_MAP
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#include "DXILOperation.inc"
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#undef DXIL_OP_INTRINSIC_MAP
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for (Function &F : make_early_inc_range(M.functions())) {
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if (!F.isDeclaration())
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continue;
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Intrinsic::ID ID = F.getIntrinsicID();
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if (ID == Intrinsic::not_intrinsic)
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continue;
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auto LowerIt = LowerMap.find(ID);
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if (LowerIt == LowerMap.end())
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continue;
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lowerIntrinsic(LowerIt->second, F, M);
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Updated = true;
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}
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return Updated;
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}
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namespace {
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/// A pass that transforms external global definitions into declarations.
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class DXILOpLowering : public PassInfoMixin<DXILOpLowering> {
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public:
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PreservedAnalyses run(Module &M, ModuleAnalysisManager &) {
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if (lowerIntrinsics(M))
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return PreservedAnalyses::none();
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return PreservedAnalyses::all();
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}
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};
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} // namespace
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namespace {
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class DXILOpLoweringLegacy : public ModulePass {
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public:
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bool runOnModule(Module &M) override { return lowerIntrinsics(M); }
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StringRef getPassName() const override { return "DXIL Op Lowering"; }
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DXILOpLoweringLegacy() : ModulePass(ID) {}
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static char ID; // Pass identification.
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void getAnalysisUsage(llvm::AnalysisUsage &AU) const override {
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// Specify the passes that your pass depends on
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AU.addRequired<DXILIntrinsicExpansionLegacy>();
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}
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};
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char DXILOpLoweringLegacy::ID = 0;
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} // end anonymous namespace
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INITIALIZE_PASS_BEGIN(DXILOpLoweringLegacy, DEBUG_TYPE, "DXIL Op Lowering",
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false, false)
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INITIALIZE_PASS_END(DXILOpLoweringLegacy, DEBUG_TYPE, "DXIL Op Lowering", false,
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false)
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ModulePass *llvm::createDXILOpLoweringLegacyPass() {
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return new DXILOpLoweringLegacy();
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}
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