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[FastISel] Add some debug output (NFC) 

Print a debug message when aborting isel (next to the ORE report)
and when folding a load.
This commit is contained in:
Nikita Popov 2022-05-12 12:22:51 +02:00
parent ca6cbbe8d0
commit 50f846d634
1 changed files with 3 additions and 0 deletions
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3
llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
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@ -706,6 +706,7 @@ static void reportFastISelFailure(MachineFunction &MF,
report_fatal_error(Twine(R.getMsg()));
ORE.emit(R);
LLVM_DEBUG(dbgs() << R.getMsg() << "\n");
}
void SelectionDAGISel::SelectBasicBlock(BasicBlock::const_iterator Begin,
@ -1524,6 +1525,8 @@ void SelectionDAGISel::SelectAllBasicBlocks(const Function &Fn) {
BeforeInst->hasOneUse() &&
FastIS->tryToFoldLoad(cast<LoadInst>(BeforeInst), Inst)) {
// If we succeeded, don't re-select the load.
LLVM_DEBUG(dbgs()
<< "FastISel folded load: " << *BeforeInst << "\n");
BI = std::next(BasicBlock::const_iterator(BeforeInst));
--NumFastIselRemaining;
++NumFastIselSuccess;