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IR: Function summary representation for type tests.

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Each function summary has an attached list of type identifier GUIDs. The
idea is that during the regular LTO phase we would match these GUIDs to type
identifiers defined by the regular LTO module and store the resolutions in
a top-level "type identifier summary" (which will be implemented separately).

Differential Revision: https://reviews.llvm.org/D27967

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@290280 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Peter Collingbourne
2016-12-21 23:03:45 +00:00
parent 57e4fa8aaa
commit ea3f918aec
8 changed files with 102 additions and 10 deletions
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lib/Analysis/ModuleSummaryAnalysis.cpp
+28 -6
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@@ -22,6 +22,7 @@
#include "llvm/Analysis/IndirectCallPromotionAnalysis.h"
#include "llvm/Analysis/LoopInfo.h"
#include "llvm/Analysis/ProfileSummaryInfo.h"
#include "llvm/Analysis/TypeMetadataUtils.h"
#include "llvm/IR/CallSite.h"
#include "llvm/IR/Dominators.h"
#include "llvm/IR/InstIterator.h"
@@ -92,6 +93,7 @@ static void computeFunctionSummary(ModuleSummaryIndex &Index, const Module &M,
// counts for all static calls to a given callee.
MapVector<ValueInfo, CalleeInfo> CallGraphEdges;
SetVector<ValueInfo> RefEdges;
SetVector<GlobalValue::GUID> TypeTests;
ICallPromotionAnalysis ICallAnalysis;
bool HasInlineAsmMaybeReferencingInternal = false;
@@ -123,11 +125,29 @@ static void computeFunctionSummary(ModuleSummaryIndex &Index, const Module &M,
assert(!CalledFunction && "Expected null called function in callsite for alias");
CalledFunction = dyn_cast<Function>(GA->getBaseObject());
}
// Check if this is a direct call to a known function.
// Check if this is a direct call to a known function or a known
// intrinsic, or an indirect call with profile data.
if (CalledFunction) {
// Skip intrinsics.
if (CalledFunction->isIntrinsic())
continue;
if (CalledFunction->isIntrinsic()) {
if (CalledFunction->getIntrinsicID() != Intrinsic::type_test)
continue;
// Produce a summary from type.test intrinsics. We only summarize
// type.test intrinsics that are used other than by an llvm.assume
// intrinsic. Intrinsics that are assumed are relevant only to the
// devirtualization pass, not the type test lowering pass.
bool HasNonAssumeUses = llvm::any_of(CI->uses(), [](const Use &CIU) {
auto *AssumeCI = dyn_cast<CallInst>(CIU.getUser());
if (!AssumeCI)
return true;
Function *F = AssumeCI->getCalledFunction();
return !F || F->getIntrinsicID() != Intrinsic::assume;
});
if (HasNonAssumeUses) {
auto *TypeMDVal = cast<MetadataAsValue>(CI->getArgOperand(1));
if (auto *TypeId = dyn_cast<MDString>(TypeMDVal->getMetadata()))
TypeTests.insert(GlobalValue::getGUID(TypeId->getString()));
}
}
// We should have named any anonymous globals
assert(CalledFunction->hasName());
auto ScaledCount = BFI ? BFI->getBlockProfileCount(&BB) : None;
@@ -160,7 +180,8 @@ static void computeFunctionSummary(ModuleSummaryIndex &Index, const Module &M,
GlobalValueSummary::GVFlags Flags(F);
auto FuncSummary = llvm::make_unique<FunctionSummary>(
Flags, NumInsts, RefEdges.takeVector(), CallGraphEdges.takeVector());
Flags, NumInsts, RefEdges.takeVector(), CallGraphEdges.takeVector(),
TypeTests.takeVector());
if (HasInlineAsmMaybeReferencingInternal)
FuncSummary->setHasInlineAsmMaybeReferencingInternal();
Index.addGlobalValueSummary(F.getName(), std::move(FuncSummary));
@@ -280,7 +301,8 @@ ModuleSummaryIndex llvm::buildModuleSummaryIndex(
std::unique_ptr<FunctionSummary> Summary =
llvm::make_unique<FunctionSummary>(
GVFlags, 0, ArrayRef<ValueInfo>{},
ArrayRef<FunctionSummary::EdgeTy>{});
ArrayRef<FunctionSummary::EdgeTy>{},
ArrayRef<GlobalValue::GUID>{});
Summary->setNoRename();
Index.addGlobalValueSummary(Name, std::move(Summary));
} else {