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Add tests for simple jump threading

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This commit is contained in:
Meghana Gupta
2022-11-17 00:05:21 -08:00
parent 5d2967ca75
commit dac6c0303f
8 changed files with 180 additions and 183 deletions
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6
lib/SILOptimizer/Transforms/SimplifyCFG.cpp
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@@ -924,6 +924,11 @@ bool SimplifyCFG::tryJumpThreading(BranchInst *BI) {
if (destTerminator->isFunctionExiting())
return false;
// There is no benefit duplicating such a destination.
if (DestBB->getSinglePredecessorBlock() != nullptr) {
return false;
}
// Jump threading only makes sense if there is an argument on the branch
// (which is reacted on in the DestBB), or if this goes through a memory
// location (switch_enum_addr is the only address-instruction which we
@@ -942,6 +947,7 @@ bool SimplifyCFG::tryJumpThreading(BranchInst *BI) {
for (unsigned i : indices(BI->getArgs())) {
SILValue Arg = BI->getArg(i);
// TODO: Verify if we need to jump thread to remove releases in OSSA.
// If the value being substituted on is release there is a chance we could
// remove the release after jump threading.
if (!Arg->getType().isTrivial(*SrcBB->getParent()) &&