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SCEVExpander: Don't look at uses of constants (#134691)

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This could be more relaxed, and look for uses of globals in
the same function but no tests apparently depend on that.
This commit is contained in:
Matt Arsenault 2025-04-07 21:56:00 +07:00 committed by Matt Arsenault
parent 393c783a10
commit 30ae47eeef
1 changed files with 16 additions and 13 deletions
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29
llvm/lib/Transforms/Utils/ScalarEvolutionExpander.cpp
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@ -111,20 +111,23 @@ Value *SCEVExpander::ReuseOrCreateCast(Value *V, Type *Ty,
Value *Ret = nullptr;
// Check to see if there is already a cast!
for (User *U : V->users()) {
if (U->getType() != Ty)
continue;
CastInst *CI = dyn_cast<CastInst>(U);
if (!CI || CI->getOpcode() != Op)
continue;
if (!isa<Constant>(V)) {
// Check to see if there is already a cast!
for (User *U : V->users()) {
if (U->getType() != Ty)
continue;
CastInst *CI = dyn_cast<CastInst>(U);
if (!CI || CI->getOpcode() != Op)
continue;
// Found a suitable cast that is at IP or comes before IP. Use it. Note that
// the cast must also properly dominate the Builder's insertion point.
if (IP->getParent() == CI->getParent() && &*BIP != CI &&
(&*IP == CI || CI->comesBefore(&*IP))) {
Ret = CI;
break;
// Found a suitable cast that is at IP or comes before IP. Use it. Note
// that the cast must also properly dominate the Builder's insertion
// point.
if (IP->getParent() == CI->getParent() && &*BIP != CI &&
(&*IP == CI || CI->comesBefore(&*IP))) {
Ret = CI;
break;
}
}
}