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//===-- SITypeRewriter.cpp - Remove unwanted types ------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
/// \file
/// This pass removes performs the following type substitution on all
/// non-compute shaders:
///
/// v16i8 => i128
/// - v16i8 is used for constant memory resource descriptors. This type is
/// legal for some compute APIs, and we don't want to declare it as legal
/// in the backend, because we want the legalizer to expand all v16i8
/// operations.
/// v1* => *
/// - Having v1* types complicates the legalizer and we can easily replace
/// - them with the element type.
//===----------------------------------------------------------------------===//
#include "AMDGPU.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/InstVisitor.h"
using namespace llvm;
namespace {
class SITypeRewriter : public FunctionPass,
public InstVisitor<SITypeRewriter> {
static char ID;
Module *Mod;
Type *v16i8;
Type *v4i32;
public:
SITypeRewriter() : FunctionPass(ID) { }
bool doInitialization(Module &M) override;
bool runOnFunction(Function &F) override;
const char *getPassName() const override {
return "SI Type Rewriter";
}
void visitLoadInst(LoadInst &I);
void visitCallInst(CallInst &I);
void visitBitCast(BitCastInst &I);
};
} // End anonymous namespace
char SITypeRewriter::ID = 0;
bool SITypeRewriter::doInitialization(Module &M) {
Mod = &M;
v16i8 = VectorType::get(Type::getInt8Ty(M.getContext()), 16);
v4i32 = VectorType::get(Type::getInt32Ty(M.getContext()), 4);
return false;
}
bool SITypeRewriter::runOnFunction(Function &F) {
Attribute A = F.getFnAttribute("ShaderType");
unsigned ShaderType = ShaderType::COMPUTE;
if (A.isStringAttribute()) {
StringRef Str = A.getValueAsString();
Str.getAsInteger(0, ShaderType);
}
if (ShaderType == ShaderType::COMPUTE)
return false;
visit(F);
visit(F);
return false;
}
void SITypeRewriter::visitLoadInst(LoadInst &I) {
Value *Ptr = I.getPointerOperand();
Type *PtrTy = Ptr->getType();
Type *ElemTy = PtrTy->getPointerElementType();
IRBuilder<> Builder(&I);
if (ElemTy == v16i8) {
Value *BitCast = Builder.CreateBitCast(Ptr,
PointerType::get(v4i32,PtrTy->getPointerAddressSpace()));
LoadInst *Load = Builder.CreateLoad(BitCast);
SmallVector<std::pair<unsigned, MDNode *>, 8> MD;
I.getAllMetadataOtherThanDebugLoc(MD);
for (unsigned i = 0, e = MD.size(); i != e; ++i) {
Load->setMetadata(MD[i].first, MD[i].second);
}
Value *BitCastLoad = Builder.CreateBitCast(Load, I.getType());
I.replaceAllUsesWith(BitCastLoad);
I.eraseFromParent();
}
}
void SITypeRewriter::visitCallInst(CallInst &I) {
IRBuilder<> Builder(&I);
SmallVector <Value*, 8> Args;
SmallVector <Type*, 8> Types;
bool NeedToReplace = false;
Function *F = I.getCalledFunction();
std::string Name = F->getName();
for (unsigned i = 0, e = I.getNumArgOperands(); i != e; ++i) {
Value *Arg = I.getArgOperand(i);
if (Arg->getType() == v16i8) {
Args.push_back(Builder.CreateBitCast(Arg, v4i32));
Types.push_back(v4i32);
NeedToReplace = true;
Name = Name + ".v4i32";
} else if (Arg->getType()->isVectorTy() &&
Arg->getType()->getVectorNumElements() == 1 &&
Arg->getType()->getVectorElementType() ==
Type::getInt32Ty(I.getContext())){
Type *ElementTy = Arg->getType()->getVectorElementType();
std::string TypeName = "i32";
InsertElementInst *Def = cast<InsertElementInst>(Arg);
Args.push_back(Def->getOperand(1));
Types.push_back(ElementTy);
std::string VecTypeName = "v1" + TypeName;
Name = Name.replace(Name.find(VecTypeName), VecTypeName.length(), TypeName);
NeedToReplace = true;
} else {
Args.push_back(Arg);
Types.push_back(Arg->getType());
}
}
if (!NeedToReplace) {
return;
}
Function *NewF = Mod->getFunction(Name);
if (!NewF) {
NewF = Function::Create(FunctionType::get(F->getReturnType(), Types, false), GlobalValue::ExternalLinkage, Name, Mod);
NewF->setAttributes(F->getAttributes());
}
I.replaceAllUsesWith(Builder.CreateCall(NewF, Args));
I.eraseFromParent();
}
void SITypeRewriter::visitBitCast(BitCastInst &I) {
IRBuilder<> Builder(&I);
if (I.getDestTy() != v4i32) {
return;
}
if (BitCastInst *Op = dyn_cast<BitCastInst>(I.getOperand(0))) {
if (Op->getSrcTy() == v4i32) {
I.replaceAllUsesWith(Op->getOperand(0));
I.eraseFromParent();
}
}
}
FunctionPass *llvm::createSITypeRewriter() {
return new SITypeRewriter();
}
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