[InstCombine] Don't insert an instruction after a terminator
We tried to insert a cast of a phi in a block whose terminator is an
EHPad. This is invalid. Do not attempt the transform in these
circumstances.
llvm-svn: 252370
diff --git a/llvm/lib/Transforms/InstCombine/InstCombinePHI.cpp b/llvm/lib/Transforms/InstCombine/InstCombinePHI.cpp
index 1d3b837..a9f8f49 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombinePHI.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombinePHI.cpp
@@ -469,6 +469,12 @@
/// only used by the PHI, PHI together their inputs, and do the operation once,
/// to the result of the PHI.
Instruction *InstCombiner::FoldPHIArgOpIntoPHI(PHINode &PN) {
+ // We cannot create a new instruction after the PHI if the terminator is an
+ // EHPad because there is no valid insertion point.
+ if (TerminatorInst *TI = PN.getParent()->getTerminator())
+ if (TI->isEHPad())
+ return nullptr;
+
Instruction *FirstInst = cast<Instruction>(PN.getIncomingValue(0));
if (isa<GetElementPtrInst>(FirstInst))