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//===- DXILOpLower.cpp - Lowering LLVM intrinsic to DIXLOp function -------===//
//
// 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 This file contains passes and utilities to lower llvm intrinsic call
/// to DXILOp function call.
//===----------------------------------------------------------------------===//
#include "DXILConstants.h"
#include "DXILIntrinsicExpansion.h"
#include "DXILOpBuilder.h"
#include "DirectX.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/Instruction.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/IntrinsicsDirectX.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/PassManager.h"
#include "llvm/Pass.h"
#include "llvm/Support/ErrorHandling.h"
#define DEBUG_TYPE "dxil-op-lower"
using namespace llvm;
using namespace llvm::dxil;
static bool isVectorArgExpansion(Function &F) {
switch (F.getIntrinsicID()) {
case Intrinsic::dx_dot2:
case Intrinsic::dx_dot3:
case Intrinsic::dx_dot4:
return true;
}
return false;
}
static SmallVector<Value *> populateOperands(Value *Arg, IRBuilder<> &Builder) {
SmallVector<Value *> ExtractedElements;
auto *VecArg = dyn_cast<FixedVectorType>(Arg->getType());
for (unsigned I = 0; I < VecArg->getNumElements(); ++I) {
Value *Index = ConstantInt::get(Type::getInt32Ty(Arg->getContext()), I);
Value *ExtractedElement = Builder.CreateExtractElement(Arg, Index);
ExtractedElements.push_back(ExtractedElement);
}
return ExtractedElements;
}
static SmallVector<Value *> argVectorFlatten(CallInst *Orig,
IRBuilder<> &Builder) {
// Note: arg[NumOperands-1] is a pointer and is not needed by our flattening.
unsigned NumOperands = Orig->getNumOperands() - 1;
assert(NumOperands > 0);
Value *Arg0 = Orig->getOperand(0);
[[maybe_unused]] auto *VecArg0 = dyn_cast<FixedVectorType>(Arg0->getType());
assert(VecArg0);
SmallVector<Value *> NewOperands = populateOperands(Arg0, Builder);
for (unsigned I = 1; I < NumOperands; ++I) {
Value *Arg = Orig->getOperand(I);
[[maybe_unused]] auto *VecArg = dyn_cast<FixedVectorType>(Arg->getType());
assert(VecArg);
assert(VecArg0->getElementType() == VecArg->getElementType());
assert(VecArg0->getNumElements() == VecArg->getNumElements());
auto NextOperandList = populateOperands(Arg, Builder);
NewOperands.append(NextOperandList.begin(), NextOperandList.end());
}
return NewOperands;
}
static void lowerIntrinsic(dxil::OpCode DXILOp, Function &F, Module &M) {
IRBuilder<> B(M.getContext());
DXILOpBuilder DXILB(M, B);
Type *OverloadTy = DXILB.getOverloadTy(DXILOp, F.getFunctionType());
for (User *U : make_early_inc_range(F.users())) {
CallInst *CI = dyn_cast<CallInst>(U);
if (!CI)
continue;
SmallVector<Value *> Args;
Value *DXILOpArg = B.getInt32(static_cast<unsigned>(DXILOp));
Args.emplace_back(DXILOpArg);
B.SetInsertPoint(CI);
if (isVectorArgExpansion(F)) {
SmallVector<Value *> NewArgs = argVectorFlatten(CI, B);
Args.append(NewArgs.begin(), NewArgs.end());
} else
Args.append(CI->arg_begin(), CI->arg_end());
CallInst *DXILCI =
DXILB.createDXILOpCall(DXILOp, F.getReturnType(), OverloadTy, Args);
CI->replaceAllUsesWith(DXILCI);
CI->eraseFromParent();
}
if (F.user_empty())
F.eraseFromParent();
}
static bool lowerIntrinsics(Module &M) {
bool Updated = false;
#define DXIL_OP_INTRINSIC_MAP
#include "DXILOperation.inc"
#undef DXIL_OP_INTRINSIC_MAP
for (Function &F : make_early_inc_range(M.functions())) {
if (!F.isDeclaration())
continue;
Intrinsic::ID ID = F.getIntrinsicID();
if (ID == Intrinsic::not_intrinsic)
continue;
auto LowerIt = LowerMap.find(ID);
if (LowerIt == LowerMap.end())
continue;
lowerIntrinsic(LowerIt->second, F, M);
Updated = true;
}
return Updated;
}
namespace {
/// A pass that transforms external global definitions into declarations.
class DXILOpLowering : public PassInfoMixin<DXILOpLowering> {
public:
PreservedAnalyses run(Module &M, ModuleAnalysisManager &) {
if (lowerIntrinsics(M))
return PreservedAnalyses::none();
return PreservedAnalyses::all();
}
};
} // namespace
namespace {
class DXILOpLoweringLegacy : public ModulePass {
public:
bool runOnModule(Module &M) override { return lowerIntrinsics(M); }
StringRef getPassName() const override { return "DXIL Op Lowering"; }
DXILOpLoweringLegacy() : ModulePass(ID) {}
static char ID; // Pass identification.
void getAnalysisUsage(llvm::AnalysisUsage &AU) const override {
// Specify the passes that your pass depends on
AU.addRequired<DXILIntrinsicExpansionLegacy>();
}
};
char DXILOpLoweringLegacy::ID = 0;
} // end anonymous namespace
INITIALIZE_PASS_BEGIN(DXILOpLoweringLegacy, DEBUG_TYPE, "DXIL Op Lowering",
false, false)
INITIALIZE_PASS_END(DXILOpLoweringLegacy, DEBUG_TYPE, "DXIL Op Lowering", false,
false)
ModulePass *llvm::createDXILOpLoweringLegacyPass() {
return new DXILOpLoweringLegacy();
}
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