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Follow-up to D105207, only salvage affine SCEVs to avoid a crash

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SCEVToIterCountExpr only expects to be fed affine expressions, but
DbgRewriteSalvageableDVIs is feeding it non-affine induction variables.
Following this up with an obvious fix, will add test coverage too if
this avoids D105207 being reverted.

(cherry picked from commit 2537120c870c04893636f171f553024f378c2de8)
This commit is contained in:
Jeremy Morse 2021-07-29 11:45:50 +01:00 committed by Chris Jackson
parent ff86d9e5f0
commit 46ad88f625
1 changed files with 3 additions and 0 deletions
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3
lib/Transforms/Scalar/LoopStrengthReduce.cpp
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@ -6162,6 +6162,9 @@ DbgRewriteSalvageableDVIs(llvm::Loop *L, ScalarEvolution &SE,
bool Changed = false;
if (const SCEVAddRecExpr *IVAddRec =
dyn_cast<SCEVAddRecExpr>(SCEVInductionVar)) {
if (!IVAddRec->isAffine())
return false;
SCEVDbgValueBuilder IterCountExpr;
IterCountExpr.pushValue(LSRInductionVar);
if (!IterCountExpr.SCEVToIterCountExpr(*IVAddRec, SE))