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/*========================== begin_copyright_notice ============================
Copyright (C) 2017-2021 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ===========================*/
#define DEBUG_TYPE "addrspacecast-fixer"
#include "Compiler/CISACodeGen/FixAddrSpaceCast.h"
#include "Compiler/CISACodeGen/ShaderCodeGen.hpp"
#include "Compiler/CodeGenContextWrapper.hpp"
#include "Compiler/MetaDataUtilsWrapper.h"
#include "Compiler/IGCPassSupport.h"
#include "common/LLVMWarningsPush.hpp"
#include <llvm/IR/IRBuilder.h>
#include <llvm/Pass.h>
#include "common/LLVMWarningsPop.hpp"
#include "GenISAIntrinsics/GenIntrinsics.h"
using namespace llvm;
using namespace IGC;
using namespace IGC::IGCMD;
namespace {
class AddrSpaceCastFixing : public FunctionPass {
const unsigned GAS = ADDRESS_SPACE_GENERIC;
const unsigned PrivateAS = ADDRESS_SPACE_PRIVATE;
public:
static char ID;
AddrSpaceCastFixing() : FunctionPass(ID) {
initializeAddrSpaceCastFixingPass(*PassRegistry::getPassRegistry());
}
bool runOnFunction(Function&) override;
void getAnalysisUsage(AnalysisUsage& AU) const override {
AU.setPreservesCFG();
}
private:
bool fixOnBasicBlock(BasicBlock*) const;
bool fixCase1(Instruction* I, BasicBlock::iterator& BI) const;
bool fixCase2(Instruction* I, BasicBlock::iterator& BI) const;
};
} // End anonymous namespace
FunctionPass* IGC::createFixAddrSpaceCastPass() {
return new AddrSpaceCastFixing();
}
char AddrSpaceCastFixing::ID = 0;
#define PASS_FLAG "igc-addrspacecast-fix"
#define PASS_DESC "Fix invalid addrspacecast-relevant patterns"
#define PASS_CFG_ONLY false
#define PASS_ANALYSIS false
namespace IGC {
IGC_INITIALIZE_PASS_BEGIN(AddrSpaceCastFixing, PASS_FLAG, PASS_DESC, PASS_CFG_ONLY, PASS_ANALYSIS)
IGC_INITIALIZE_PASS_END(AddrSpaceCastFixing, PASS_FLAG, PASS_DESC, PASS_CFG_ONLY, PASS_ANALYSIS)
}
bool AddrSpaceCastFixing::runOnFunction(Function& F) {
bool Changed = false;
for (auto& BB : F)
Changed |= fixOnBasicBlock(&BB);
return Changed;
}
bool AddrSpaceCastFixing::fixOnBasicBlock(BasicBlock* BB) const {
bool Changed = false;
for (auto BI = BB->begin(), BE = BB->end(); BI != BE; /* EMPTY */) {
Instruction* I = &(*BI++);
if (fixCase1(I, BI)) {
Changed = true;
continue;
}
if (fixCase2(I, BI)) {
Changed = true;
continue;
}
}
return Changed;
}
/// fixCase1 - Convert pair of `ptrtoint`/`inttoptr` through `i64` back to
/// `addrspacecast`.
bool AddrSpaceCastFixing::fixCase1(Instruction* I, BasicBlock::iterator& BI) const {
// Find the eligible pair of `ptrtoint`/`inttoptr` and convert them back
// to `addrspacecast`.
IntToPtrInst* I2P = dyn_cast<IntToPtrInst>(I);
if (!I2P)
return false;
PointerType* DstPtrTy = cast<PointerType>(I2P->getType());
PtrToIntInst* P2I = dyn_cast<PtrToIntInst>(I2P->getOperand(0));
if (!P2I)
return false;
if (!P2I->hasOneUse() || !P2I->getType()->isIntegerTy(64))
return false;
Value* V = P2I->getOperand(0);
PointerType* SrcPtrTy = cast<PointerType>(V->getType());
// Skip generating `bitcast` if their element types are different. Leave that
// canonicalization in GAS resolver.
// Create `addrspacecast` if necessary.
if (SrcPtrTy->getAddressSpace() != DstPtrTy->getAddressSpace())
V = CastInst::Create(Instruction::AddrSpaceCast, V, DstPtrTy,
I->getName() + ".fix1.addrspacecast", I);
else
V = CastInst::Create(Instruction::BitCast, V, DstPtrTy,
I->getName() + ".fix1.bitcast", I);
// Remove the short sequence of `ptrtoint` followed by `inttoptr`.
if (Instruction* VInst = dyn_cast<Instruction>(V))
{
VInst->setDebugLoc(I2P->getDebugLoc());
}
I2P->replaceAllUsesWith(V);
I2P->eraseFromParent();
P2I->eraseFromParent();
if (isa<Instruction>(V))
BI = BasicBlock::iterator(cast<Instruction>(V));
return true;
}
/// fixCase2 - Convert the following sequence into a valid one.
///
/// (addrspacecast-gas
/// (select %cond (addrspacecast-private %ptr1)
/// (addrspacecast-private %ptr2)))
///
/// into
///
/// (select %cond (addrspacecast-gas %ptr1)
/// (addrspacecast-gas %ptr2))
///
bool AddrSpaceCastFixing::fixCase2(Instruction* I, BasicBlock::iterator& BI) const {
AddrSpaceCastInst* CI = dyn_cast<AddrSpaceCastInst>(I);
// Skip if it's not an addrspacecast to GAS
if (!CI || cast<PointerType>(CI->getType())->getAddressSpace() != GAS)
return false;
// Skip if it's not a select of private pointers.
SelectInst* SI = dyn_cast<SelectInst>(CI->getOperand(0));
if (!SI || cast<PointerType>(SI->getType())->getAddressSpace() != PrivateAS)
return false;
PointerType* DstPtrTy = cast<PointerType>(CI->getType());
// Skip if T/F values don't agree on address space.
Value* TVal = SI->getTrueValue();
if (TVal->hasOneUse() && isa<AddrSpaceCastInst>(TVal))
TVal->mutateType(DstPtrTy);
else
TVal = CastInst::Create(Instruction::AddrSpaceCast, TVal, DstPtrTy,
TVal->getName() + ".fix2.addrspacecast", SI);
Value* FVal = SI->getFalseValue();
if (FVal->hasOneUse() && isa<AddrSpaceCastInst>(FVal))
FVal->mutateType(DstPtrTy);
else
FVal = CastInst::Create(Instruction::AddrSpaceCast, FVal, DstPtrTy,
FVal->getName() + ".fix2.addrspacecast", SI);
SI->setOperand(1, TVal);
SI->setOperand(2, FVal);
SI->mutateType(DstPtrTy);
CI->replaceAllUsesWith(SI);
CI->eraseFromParent();
return true;
}
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