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/*========================== begin_copyright_notice ============================
Copyright (C) 2021 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ===========================*/
//
// Utility break Constant functions for the GenX backend.
//
//===----------------------------------------------------------------------===//
#include "vc/Utils/GenX/BreakConst.h"
#include <llvm/ADT/PostOrderIterator.h>
#include <llvm/IR/Constants.h>
#include <llvm/IR/Dominators.h>
#include <llvm/IR/Function.h>
#include <llvm/IR/IRBuilder.h>
#include <llvm/IR/Instructions.h>
#include <llvm/IR/IntrinsicInst.h>
#include <llvm/IR/Intrinsics.h>
#include <llvm/IR/Metadata.h>
#include <llvm/IR/Module.h>
#include <llvm/Support/Casting.h>
#include "Probe/Assertion.h"
#include "llvmWrapper/IR/DerivedTypes.h"
#include "llvmWrapper/IR/InstrTypes.h"
#include "llvmWrapper/IR/Instructions.h"
#include "vc/Utils/GenX/Region.h"
#include "vc/Utils/GenX/TypeSize.h"
#include <cstddef>
#include <iterator>
using namespace llvm;
using namespace vc;
static Value *undefVector(Type *ScalarType, unsigned ElNum) {
IGC_ASSERT(!ScalarType->isVectorTy());
return UndefValue::get(IGCLLVM::FixedVectorType::get(ScalarType, ElNum));
}
static Value *buildNonLegalizedConstantVector(ArrayRef<Value *> Vals,
Instruction *InsertPt,
const DebugLoc &DbgLoc) {
IGC_ASSERT(!Vals.empty());
Value *Result = undefVector(Vals.front()->getType(), Vals.size());
IRBuilder<> Builder(InsertPt);
Builder.SetCurrentDebugLocation(DbgLoc);
for (unsigned j = 0, N = Vals.size(); j < N; ++j)
Result = Builder.CreateInsertElement(Result, Vals[j], j);
return Result;
}
static Value *buildLegalizedConstantVector(ArrayRef<Value *> Vals,
Instruction *InsertPt,
const DebugLoc &DbgLoc) {
IGC_ASSERT(!Vals.empty());
const auto& DL = InsertPt->getModule()->getDataLayout();
Type *ScalarType = Vals.front()->getType();
Value *Result = undefVector(ScalarType, Vals.size());
IntegerType *I16Ty = Type::getInt16Ty(InsertPt->getContext());
unsigned ElBytes = vc::getTypeSize(ScalarType, &DL).inBytes();
for (unsigned j = 0, N = Vals.size(); j < N; ++j) {
CMRegion R(Vals[j], &DL);
R.Indirect = ConstantInt::get(I16Ty, ElBytes * j);
Result = R.createWrRegion(Result, Vals[j], ".vconst", InsertPt, DbgLoc);
}
return Result;
}
Value *vc::breakConstantVector(ConstantVector *CV, Instruction *CurInst,
Instruction *InsertPt,
vc::LegalizationStage LegalizationStage) {
IGC_ASSERT(CurInst);
IGC_ASSERT(InsertPt);
if (!CV)
return nullptr;
const auto &DbgLoc = CurInst->getDebugLoc();
// Splat case.
if (auto *S = dyn_cast_or_null<ConstantExpr>(CV->getSplatValue())) {
// Turn element into an instruction
auto Inst = S->getAsInstruction();
Inst->setDebugLoc(DbgLoc);
Inst->insertBefore(InsertPt);
Value *Result = nullptr;
// Splat the value.
if (LegalizationStage == vc::LegalizationStage::Legalized) {
const auto &DL = InsertPt->getModule()->getDataLayout();
Result = CMRegion::createRdVectorSplat(DL, CV->getNumOperands(), Inst,
".splat", InsertPt, DbgLoc);
} else {
IRBuilder<> Builder(InsertPt);
Builder.SetCurrentDebugLocation(DbgLoc);
Result = Builder.CreateVectorSplat(CV->getNumOperands(), Inst);
}
// Update i-th operand with newly created splat.
CurInst->replaceUsesOfWith(CV, Result);
return Result;
}
SmallVector<Value *, 8> Vals;
bool HasConstExpr = false;
for (unsigned j = 0, N = CV->getNumOperands(); j < N; ++j) {
Value *Elt = CV->getOperand(j);
if (auto CE = dyn_cast<ConstantExpr>(Elt)) {
auto Inst = CE->getAsInstruction();
Inst->setDebugLoc(DbgLoc);
Inst->insertBefore(InsertPt);
Vals.push_back(Inst);
HasConstExpr = true;
} else
Vals.push_back(Elt);
}
if (!HasConstExpr)
return nullptr;
Value *Val = (LegalizationStage == vc::LegalizationStage::Legalized)
? buildLegalizedConstantVector(Vals, InsertPt, DbgLoc)
: buildNonLegalizedConstantVector(Vals, InsertPt, DbgLoc);
CurInst->replaceUsesOfWith(CV, Val);
return Val;
}
bool vc::breakConstantExprs(Instruction *I,
vc::LegalizationStage LegalizationStage) {
if (!I)
return false;
bool Modified = false;
std::list<Instruction *> Worklist = {I};
while (!Worklist.empty()) {
auto *CurInst = Worklist.front();
Worklist.pop_front();
PHINode *PN = dyn_cast<PHINode>(CurInst);
for (unsigned i = 0, e = CurInst->getNumOperands(); i < e; ++i) {
auto *InsertPt = PN ? PN->getIncomingBlock(i)->getTerminator() : CurInst;
Value *Op = CurInst->getOperand(i);
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Op)) {
Instruction *NewInst = CE->getAsInstruction();
NewInst->setDebugLoc(CurInst->getDebugLoc());
NewInst->insertBefore(CurInst);
CurInst->setOperand(i, NewInst);
Worklist.push_back(NewInst);
Modified = true;
} else if (auto *CV = dyn_cast<ConstantVector>(Op)) {
if (auto *CVInst =
breakConstantVector(CV, CurInst, InsertPt, LegalizationStage)) {
Worklist.push_back(cast<Instruction>(CVInst));
Modified = true;
}
}
}
}
return Modified;
}
bool vc::breakConstantExprs(Function *F,
vc::LegalizationStage LegalizationStage) {
bool Modified = false;
for (po_iterator<BasicBlock *> i = po_begin(&F->getEntryBlock()),
e = po_end(&F->getEntryBlock());
i != e; ++i) {
BasicBlock *BB = *i;
// The effect of this loop is that we process the instructions in reverse
// order, and we re-process anything inserted before the instruction
// being processed.
for (Instruction *CurInst = BB->getTerminator(); CurInst;) {
Modified |= breakConstantExprs(CurInst, LegalizationStage);
CurInst = CurInst == &BB->front() ? nullptr : CurInst->getPrevNode();
}
}
return Modified;
}
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