[InstCombine] Teach FoldPHIArgZextsIntoPHI about EHPads
FoldPHIArgZextsIntoPHI cannot insert an instruction after the PHI if
there is an EHPad in the BB. Doing so would result in an instruction
inserted after a terminator.
llvm-svn: 252377
diff --git a/llvm/lib/Transforms/InstCombine/InstCombinePHI.cpp b/llvm/lib/Transforms/InstCombine/InstCombinePHI.cpp
index a9f8f49..f1aa98b 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombinePHI.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombinePHI.cpp
@@ -401,6 +401,12 @@
/// require special-casing a cast from the 'i1' type. See the comment in
/// FoldPHIArgOpIntoPHI() about pessimizing illegal integer types.
Instruction *InstCombiner::FoldPHIArgZextsIntoPHI(PHINode &Phi) {
+ // 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 = Phi.getParent()->getTerminator())
+ if (TI->isEHPad())
+ return nullptr;
+
// Early exit for the common case of a phi with two operands. These are
// handled elsewhere. See the comment below where we check the count of zexts
// and constants for more details.