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//===---- CGLoopInfo.cpp - LLVM CodeGen for loop metadata -*- C++ -*-------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "CGLoopInfo.h"
#include "llvm/IR/BasicBlock.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/InstrTypes.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/Metadata.h"
using namespace clang;
using namespace CodeGen;
using namespace llvm;
static MDNode *createMetadata(LLVMContext &Ctx, const LoopAttributes &Attrs) {
if (!Attrs.IsParallel && Attrs.VectorizerWidth == 0 &&
Attrs.VectorizerUnroll == 0 &&
Attrs.VectorizerEnable == LoopAttributes::VecUnspecified)
return nullptr;
SmallVector<Metadata *, 4> Args;
// Reserve operand 0 for loop id self reference.
auto TempNode = MDNode::getTemporary(Ctx, None);
Args.push_back(TempNode.get());
// Setting vectorizer.width
if (Attrs.VectorizerWidth > 0) {
Metadata *Vals[] = {MDString::get(Ctx, "llvm.loop.vectorize.width"),
ConstantAsMetadata::get(ConstantInt::get(
Type::getInt32Ty(Ctx), Attrs.VectorizerWidth))};
Args.push_back(MDNode::get(Ctx, Vals));
}
// Setting vectorizer.unroll
if (Attrs.VectorizerUnroll > 0) {
Metadata *Vals[] = {MDString::get(Ctx, "llvm.loop.interleave.count"),
ConstantAsMetadata::get(ConstantInt::get(
Type::getInt32Ty(Ctx), Attrs.VectorizerUnroll))};
Args.push_back(MDNode::get(Ctx, Vals));
}
// Setting vectorizer.enable
if (Attrs.VectorizerEnable != LoopAttributes::VecUnspecified) {
Metadata *Vals[] = {
MDString::get(Ctx, "llvm.loop.vectorize.enable"),
ConstantAsMetadata::get(ConstantInt::get(
Type::getInt1Ty(Ctx),
(Attrs.VectorizerEnable == LoopAttributes::VecEnable)))};
Args.push_back(MDNode::get(Ctx, Vals));
}
// Set the first operand to itself.
MDNode *LoopID = MDNode::get(Ctx, Args);
LoopID->replaceOperandWith(0, LoopID);
return LoopID;
}
LoopAttributes::LoopAttributes(bool IsParallel)
: IsParallel(IsParallel), VectorizerEnable(LoopAttributes::VecUnspecified),
VectorizerWidth(0), VectorizerUnroll(0) {}
void LoopAttributes::clear() {
IsParallel = false;
VectorizerWidth = 0;
VectorizerUnroll = 0;
VectorizerEnable = LoopAttributes::VecUnspecified;
}
LoopInfo::LoopInfo(BasicBlock *Header, const LoopAttributes &Attrs)
: LoopID(nullptr), Header(Header), Attrs(Attrs) {
LoopID = createMetadata(Header->getContext(), Attrs);
}
void LoopInfoStack::push(BasicBlock *Header) {
Active.push_back(LoopInfo(Header, StagedAttrs));
// Clear the attributes so nested loops do not inherit them.
StagedAttrs.clear();
}
void LoopInfoStack::pop() {
assert(!Active.empty() && "No active loops to pop");
Active.pop_back();
}
void LoopInfoStack::InsertHelper(Instruction *I) const {
if (!hasInfo())
return;
const LoopInfo &L = getInfo();
if (!L.getLoopID())
return;
if (TerminatorInst *TI = dyn_cast<TerminatorInst>(I)) {
for (unsigned i = 0, ie = TI->getNumSuccessors(); i < ie; ++i)
if (TI->getSuccessor(i) == L.getHeader()) {
TI->setMetadata("llvm.loop", L.getLoopID());
break;
}
return;
}
if (L.getAttributes().IsParallel && I->mayReadOrWriteMemory())
I->setMetadata("llvm.mem.parallel_loop_access", L.getLoopID());
}
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