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Fix a crash in the assumption cache when inlining indirect function calls

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Summary:
Instances of the AssumptionCache are per function, so we can't re-use
the same AssumptionCache instance when recursing in the CallAnalyzer to
analyze a different function. Instead we have to pass the
AssumptionCacheTracker to the CallAnalyzer so it can get the right
AssumptionCache on demand.

Reviewers: hfinkel

Subscribers: llvm-commits, hans

Differential Revision: http://reviews.llvm.org/D7533

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@228957 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bjorn Steinbrink 2015-02-12 21:04:22 +00:00
parent 82f9916923
commit 53a7b568b2
2 changed files with 25 additions and 6 deletions
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12
lib/Analysis/IPA/InlineCost.cpp
View File

@ -52,7 +52,7 @@ class CallAnalyzer : public InstVisitor<CallAnalyzer, bool> {
const TargetTransformInfo &TTI;
/// The cache of @llvm.assume intrinsics.
AssumptionCache &AC;
AssumptionCacheTracker *ACT;
// The called function.
Function &F;
@ -146,8 +146,8 @@ class CallAnalyzer : public InstVisitor<CallAnalyzer, bool> {
public:
CallAnalyzer(const DataLayout *DL, const TargetTransformInfo &TTI,
AssumptionCache &AC, Function &Callee, int Threshold)
: DL(DL), TTI(TTI), AC(AC), F(Callee), Threshold(Threshold), Cost(0),
AssumptionCacheTracker *ACT, Function &Callee, int Threshold)
: DL(DL), TTI(TTI), ACT(ACT), F(Callee), Threshold(Threshold), Cost(0),
IsCallerRecursive(false), IsRecursiveCall(false),
ExposesReturnsTwice(false), HasDynamicAlloca(false),
ContainsNoDuplicateCall(false), HasReturn(false), HasIndirectBr(false),
@ -789,7 +789,7 @@ bool CallAnalyzer::visitCallSite(CallSite CS) {
// during devirtualization and so we want to give it a hefty bonus for
// inlining, but cap that bonus in the event that inlining wouldn't pan
// out. Pretend to inline the function, with a custom threshold.
CallAnalyzer CA(DL, TTI, AC, *F, InlineConstants::IndirectCallThreshold);
CallAnalyzer CA(DL, TTI, ACT, *F, InlineConstants::IndirectCallThreshold);
if (CA.analyzeCall(CS)) {
// We were able to inline the indirect call! Subtract the cost from the
// bonus we want to apply, but don't go below zero.
@ -1135,7 +1135,7 @@ bool CallAnalyzer::analyzeCall(CallSite CS) {
// the ephemeral values multiple times (and they're completely determined by
// the callee, so this is purely duplicate work).
SmallPtrSet<const Value *, 32> EphValues;
CodeMetrics::collectEphemeralValues(&F, &AC, EphValues);
CodeMetrics::collectEphemeralValues(&F, &ACT->getAssumptionCache(F), EphValues);
// The worklist of live basic blocks in the callee *after* inlining. We avoid
// adding basic blocks of the callee which can be proven to be dead for this
@ -1335,7 +1335,7 @@ InlineCost InlineCostAnalysis::getInlineCost(CallSite CS, Function *Callee,
<< "...\n");
CallAnalyzer CA(Callee->getDataLayout(), TTIWP->getTTI(*Callee),
ACT->getAssumptionCache(*Callee), *Callee, Threshold);
ACT, *Callee, Threshold);
bool ShouldInline = CA.analyzeCall(CS);
DEBUG(CA.dump());

19
test/Transforms/Inline/inline-indirect.ll Normal file
View File

@ -0,0 +1,19 @@
; RUN: opt < %s -inline -disable-output 2>/dev/null
; This test used to trigger an assertion in the assumption cache when
; inlining the indirect call
declare void @llvm.assume(i1)
define void @foo() {
ret void
}
define void @bar(void ()*) {
call void @llvm.assume(i1 true)
call void %0();
ret void
}
define void @baz() {
call void @bar(void ()* @foo)
ret void
}