[llvm] e2537f6 - [ValueTracking] Replace dyn_cast with dyn_cast_or_null to account for getTerminator returning null

[Simon Pilgrim via llvm-commits]

Author: Simon Pilgrim
Date: 2022-02-08T13:33:26Z
New Revision: e2537f6b1989213b68eabb662b6dd5b4425f43cd

URL: https://github.com/llvm/llvm-project/commit/e2537f6b1989213b68eabb662b6dd5b4425f43cd
DIFF: https://github.com/llvm/llvm-project/commit/e2537f6b1989213b68eabb662b6dd5b4425f43cd.diff

LOG: [ValueTracking] Replace dyn_cast with dyn_cast_or_null to account for getTerminator returning null

Noticed while running checks on D117995 - a hexagon regression test was managing to return a block without a terminator

Added: 
    

Modified: 
    llvm/lib/Analysis/ValueTracking.cpp

Removed: 
    


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diff  --git a/llvm/lib/Analysis/ValueTracking.cpp b/llvm/lib/Analysis/ValueTracking.cpp
index c14bdb8bc262e..a93430cfbf53d 100644
--- a/llvm/lib/Analysis/ValueTracking.cpp
+++ b/llvm/lib/Analysis/ValueTracking.cpp
@@ -5125,10 +5125,10 @@ static bool isGuaranteedNotToBeUndefOrPoison(const Value *V,
     auto *TI = Dominator->getBlock()->getTerminator();
 
     Value *Cond = nullptr;
-    if (auto BI = dyn_cast<BranchInst>(TI)) {
+    if (auto BI = dyn_cast_or_null<BranchInst>(TI)) {
       if (BI->isConditional())
         Cond = BI->getCondition();
-    } else if (auto SI = dyn_cast<SwitchInst>(TI)) {
+    } else if (auto SI = dyn_cast_or_null<SwitchInst>(TI)) {
       Cond = SI->getCondition();
     }