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/*========================== begin_copyright_notice ============================
Copyright (C) 2021 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ===========================*/
#include "vc/Utils/General/InstRebuilder.h"
#include "vc/Utils/General/Types.h"
#include "Probe/Assertion.h"
#include "llvmWrapper/Support/Alignment.h"
#include <llvm/ADT/ArrayRef.h>
#include <llvm/IR/InstVisitor.h>
#include <llvm/IR/Instruction.h>
#include <llvm/IR/IntrinsicInst.h>
#include <algorithm>
#include <iterator>
using namespace llvm;
using namespace vc;
// Define intrinsic return type based on its arguments types.
static Type *getIntrinsicRetTypeBasedOnArgs(Intrinsic::ID IID,
ArrayRef<Type *> ArgTys,
LLVMContext &C) {
switch (IID) {
case Intrinsic::masked_gather:
// "Pass through" operand.
return ArgTys[3];
case Intrinsic::masked_scatter:
return Type::getVoidTy(C);
default:
IGC_ASSERT_MESSAGE(0, "unsupported intrinsic");
return nullptr;
}
}
// Emits list of overloaded types for the provided intrinsic. Takes all the
// types that may take part in overloading: return type, types of arguments.
static std::vector<Type *>
getIntrinsicOverloadedTypes(Intrinsic::ID IID, Type *RetTy,
ArrayRef<Type *> ArgTys) {
IGC_ASSERT_MESSAGE(RetTy, "wrong argument");
// FIXME: generalize for any ID using IntrinsicInfoTable.
switch (IID) {
case Intrinsic::masked_gather:
// Loaded value type and pointer operand type.
return {RetTy, ArgTys[0]};
case Intrinsic::masked_scatter:
// Value and pointer types.
return {ArgTys[0], ArgTys[1]};
default:
IGC_ASSERT_MESSAGE(0, "unsupported intrinsic");
return {};
}
}
namespace {
class cloneInstWithNewOpsImpl
: public InstVisitor<cloneInstWithNewOpsImpl, Instruction *> {
ArrayRef<Value *> NewOperands;
public:
cloneInstWithNewOpsImpl(ArrayRef<Value *> NewOperandsIn)
: NewOperands{NewOperandsIn} {}
Instruction *visitInstruction(Instruction &I) const {
IGC_ASSERT_MESSAGE(0, "yet unsupported instruction");
return nullptr;
}
Instruction *visitBinaryOperator(BinaryOperator &OrigBO) {
IGC_ASSERT_MESSAGE(NewOperands.size() == 2, "binary operator has 2 operands");
return BinaryOperator::Create(OrigBO.getOpcode(), NewOperands[0],
NewOperands[1]);
}
Instruction *visitGetElementPtrInst(GetElementPtrInst &OrigGEP) const {
return GetElementPtrInst::Create(OrigGEP.getSourceElementType(),
NewOperands.front(),
NewOperands.drop_front());
}
Instruction *visitTrunc(TruncInst &Trunc) {
Value &NewOp = getSingleNewOperand();
Type *NewOutType = vc::getNewTypeForCast(
Trunc.getType(), Trunc.getOperand(0)->getType(), NewOp.getType());
return new TruncInst{&NewOp, NewOutType};
}
Instruction *visitLoadInst(LoadInst &OrigLoad) {
Value &Ptr = getSingleNewOperand();
auto *NewLoad =
new LoadInst{cast<PointerType>(Ptr.getType())->getPointerElementType(),
&Ptr,
"",
OrigLoad.isVolatile(),
IGCLLVM::getAlign(OrigLoad),
OrigLoad.getOrdering(),
OrigLoad.getSyncScopeID()};
return NewLoad;
}
StoreInst *visitStoreInst(StoreInst &OrigStore) {
IGC_ASSERT_MESSAGE(NewOperands.size() == 2, "store has 2 operands");
return new StoreInst{NewOperands[0], NewOperands[1],
OrigStore.isVolatile(), IGCLLVM::getAlign(OrigStore),
OrigStore.getOrdering(), OrigStore.getSyncScopeID()};
}
// Rebuilds bitcast \p OrigInst so it now has \p NewOp as operand and result
// type addrspace corresponds with this operand.
CastInst *visitBitCastInst(BitCastInst &OrigCast) {
Value &NewOp = getSingleNewOperand();
Type *NewOutType = vc::getNewTypeForCast(
OrigCast.getType(), OrigCast.getOperand(0)->getType(), NewOp.getType());
return new BitCastInst{&NewOp, NewOutType};
}
CastInst *visitAddrSpaceCastInst(AddrSpaceCastInst &OrigCast) {
Value &NewOp = getSingleNewOperand();
auto *NewOpTy = cast<PointerType>(NewOp.getType());
auto *CastTy = cast<PointerType>(OrigCast.getType());
if (NewOpTy->getAddressSpace() == CastTy->getAddressSpace())
return nullptr;
return new AddrSpaceCastInst{&NewOp, CastTy};
}
SelectInst *visitSelectInst(SelectInst &OrigSelect) {
IGC_ASSERT_MESSAGE(NewOperands.size() == 3, "select has 3 operands");
return SelectInst::Create(NewOperands[0], NewOperands[1], NewOperands[2]);
}
IntrinsicInst *visitIntrinsicInst(IntrinsicInst &OrigIntrinsic) {
auto IID = OrigIntrinsic.getIntrinsicID();
if (IID != Intrinsic::masked_gather && IID != Intrinsic::masked_scatter) {
IGC_ASSERT_MESSAGE(0, "yet unsupported instruction");
return nullptr;
}
std::vector<Type *> ArgTys;
std::transform(NewOperands.begin(), NewOperands.end(),
std::back_inserter(ArgTys),
[](Value *Operand) { return Operand->getType(); });
auto *RetTy =
getIntrinsicRetTypeBasedOnArgs(IID, ArgTys, OrigIntrinsic.getContext());
auto OverloadedTys = getIntrinsicOverloadedTypes(IID, RetTy, ArgTys);
auto *Decl = Intrinsic::getDeclaration(OrigIntrinsic.getModule(), IID,
OverloadedTys);
return cast<IntrinsicInst>(CallInst::Create(Decl, NewOperands));
}
private:
Value &getSingleNewOperand() {
IGC_ASSERT_MESSAGE(
NewOperands.size() == 1,
"it should've been called only for instructions with a single operand");
return *NewOperands.front();
}
};
} // anonymous namespace
// Creates new instruction with all the properties taken from the \p OrigInst
// except for operands that are taken from \p NewOps.
// nullptr is returned when clonning is imposible.
Instruction *vc::cloneInstWithNewOps(Instruction &OrigInst,
ArrayRef<Value *> NewOps) {
Instruction *NewInst = cloneInstWithNewOpsImpl{NewOps}.visit(OrigInst);
if (NewInst) {
NewInst->copyIRFlags(&OrigInst);
NewInst->copyMetadata(OrigInst);
}
return NewInst;
}
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