CastInst::castIsValid should return true if the dest type is the same as

Value's current type. The casting is trivial even for aggregate type.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172143 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 5 insertions, 0 deletions

diff --git a/lib/IR/Instructions.cpp b/lib/IR/Instructions.cpp
index f2e9813bc6..26398ce851 100644
--- a/lib/IR/Instructions.cpp
+++ b/lib/IR/Instructions.cpp
@@ -2624,6 +2624,11 @@ CastInst::castIsValid(Instruction::CastOps op, Value *S, Type *DstTy) {
 
   // Check for type sanity on the arguments
   Type *SrcTy = S->getType();
+
+  // If this is a cast to the same type then it's trivially true.
+  if (SrcTy == DstTy)
+    return true;
+
   if (!SrcTy->isFirstClassType() || !DstTy->isFirstClassType() ||
       SrcTy->isAggregateType() || DstTy->isAggregateType())
     return false;