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Differential D84715 Diff 281083 llvm/lib/Analysis/BranchProbabilityInfo.cpp

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llvm/lib/Analysis/BranchProbabilityInfo.cpp

Show First 20 Lines • Show All 1,062 Lines • ▼ Show 20 Linesvoid BranchProbabilityInfo::eraseBlock(const BasicBlock *BB) {
} }
} }
void BranchProbabilityInfo::calculate(const Function &F, const LoopInfo &LI, void BranchProbabilityInfo::calculate(const Function &F, const LoopInfo &LI,
const TargetLibraryInfo *TLI, const TargetLibraryInfo *TLI,
PostDominatorTree *PDT) { PostDominatorTree *PDT) {
LLVM_DEBUG(dbgs() << "---- Branch Probability Info : " << F.getName() LLVM_DEBUG(dbgs() << "---- Branch Probability Info : " << F.getName()
<< " ----\n\n"); << " ----\n\n");
if (F.empty())
fhahnUnsubmitted
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Are empty functions valid IR? Don't they have to have at least a single BB. And each BB needs at least a terminator?

fhahn: Are empty functions valid IR? Don't they have to have at least a single BB. And each BB needs…
weiwangAuthorUnsubmitted
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This is a special case where function is marked dead and its body is completed strip away. AFAIK, it only happens before LTO backend, so analysis/pass in pass pipeline won't see such function.

weiwang: This is a special case where function is marked dead and its body is completed strip away.
return;
LastF = &F; // Store the last function we ran on for printing. LastF = &F; // Store the last function we ran on for printing.
assert(PostDominatedByUnreachable.empty()); assert(PostDominatedByUnreachable.empty());
assert(PostDominatedByColdCall.empty()); assert(PostDominatedByColdCall.empty());
// Record SCC numbers of blocks in the CFG to identify irreducible loops. // Record SCC numbers of blocks in the CFG to identify irreducible loops.
// FIXME: We could only calculate this if the CFG is known to be irreducible // FIXME: We could only calculate this if the CFG is known to be irreducible
// (perhaps cache this info in LoopInfo if we can easily calculate it there?). // (perhaps cache this info in LoopInfo if we can easily calculate it there?).
int SccNum = 0; int SccNum = 0;
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