From daa24b978986f8a31c3bfdf47cc3556caac0917d Mon Sep 17 00:00:00 2001
From: David Majnemer <david.majnemer@gmail.com>
Date: Sat, 5 Sep 2015 20:44:56 +0000
Subject: [InstCombine] Don't assume m_Mul gives back an Instruction

This fixes PR24713.

llvm-svn: 246933
---
 llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'llvm/lib/Transforms')

diff --git a/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp b/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
index 6e4336ef875..b3366bb9888 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
@@ -2246,7 +2246,9 @@ static Instruction *ProcessUMulZExtIdiom(ICmpInst &I, Value *MulVal,
 
   assert(I.getOperand(0) == MulVal || I.getOperand(1) == MulVal);
   assert(I.getOperand(0) == OtherVal || I.getOperand(1) == OtherVal);
-  Instruction *MulInstr = cast<Instruction>(MulVal);
+  auto *MulInstr = dyn_cast<Instruction>(MulVal);
+  if (!MulInstr)
+    return nullptr;
   assert(MulInstr->getOpcode() == Instruction::Mul);
 
   auto *LHS = cast<ZExtOperator>(MulInstr->getOperand(0)),
-- 
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