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[LICM] Add some debug output to scalar promotion (NFC)

This commit is contained in:
Nikita Popov 2022-09-01 10:48:49 +02:00
parent 3aab9d2bb7
commit 3f8b1d0f15
1 changed files with 9 additions and 1 deletions
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10
llvm/lib/Transforms/Scalar/LICM.cpp
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@ -1910,6 +1910,12 @@ bool llvm::promoteLoopAccessesToScalars(
SafetyInfo != nullptr && SafetyInfo != nullptr &&
"Unexpected Input to promoteLoopAccessesToScalars"); "Unexpected Input to promoteLoopAccessesToScalars");
LLVM_DEBUG({
dbgs() << "Trying to promote set of must-aliased pointers:\n";
for (Value *Ptr : PointerMustAliases)
dbgs() << " " << *Ptr << "\n";
});
Value *SomePtr = *PointerMustAliases.begin(); Value *SomePtr = *PointerMustAliases.begin();
BasicBlock *Preheader = CurLoop->getLoopPreheader(); BasicBlock *Preheader = CurLoop->getLoopPreheader();
@ -2097,8 +2103,10 @@ bool llvm::promoteLoopAccessesToScalars(
return false; return false;
// If we couldn't prove we can hoist the load, bail. // If we couldn't prove we can hoist the load, bail.
if (!DereferenceableInPH) if (!DereferenceableInPH) {
LLVM_DEBUG(dbgs() << "Not promoting: Not dereferenceable in preheader\n");
return false; return false;
}
// We know we can hoist the load, but don't have a guaranteed store. // We know we can hoist the load, but don't have a guaranteed store.
// Check whether the location is thread-local. If it is, then we can insert // Check whether the location is thread-local. If it is, then we can insert