commit bb53d23ef8127b0be819b730e5094bd1d4b8e515
author David Majnemer <david.majnemer@gmail.com> Sat Jun 25 07:37:30 2016 +0000
committer David Majnemer <david.majnemer@gmail.com> Sat Jun 25 07:37:30 2016 +0000
tree 625378805831c8775357f4cc7ff0f2eb834a7511
parent 1fea77c6fc6ab0d5557078656be6c54eba769b42

[InstSimplify] Replace calls to null with undef

Calling null is undefined behavior, we can simplify the resulting value
to undef.

llvm-svn: 273777

llvm/lib/Analysis/InstructionSimplify.cpp

diff --git a/llvm/lib/Analysis/InstructionSimplify.cpp b/llvm/lib/Analysis/InstructionSimplify.cpp
index 746b740..b52ffee 100644
--- a/llvm/lib/Analysis/InstructionSimplify.cpp
+++ b/llvm/lib/Analysis/InstructionSimplify.cpp
@@ -4009,7 +4009,8 @@
   FunctionType *FTy = cast<FunctionType>(Ty);
 
   // call undef -> undef
-  if (isa<UndefValue>(V))
+  // call null -> undef
+  if (isa<UndefValue>(V) || isa<ConstantPointerNull>(V))
     return UndefValue::get(FTy->getReturnType());
 
   Function *F = dyn_cast<Function>(V);