rsmith added inline comments.

================
Comment at: lib/Sema/SemaCast.cpp:1081-1083
@@ -1080,3 +1080,5 @@
           }
-          Kind = CK_BitCast;
+          unsigned SrcAS = SrcPointee.getAddressSpace();
+          unsigned DestAS = DestPointee.getAddressSpace();
+          Kind = SrcAS != DestAS ? CK_AddressSpaceConversion : CK_BitCast;
           return TC_Success;
----------------
I would expect to get both a `CK_BitCast` *and* a `CK_AddressSpaceCast` created 
for this case. Note that by not returning `CK_BitCast`, you lose the 
`checkCastAlign` call in the caller.

Instead, can you push this check down into wherever we're building the 
conversion, so that if we try to create a `CK_BitCast` that crosses address 
spaces, we additionally create a `CK_AddressSpaceCast`?


http://reviews.llvm.org/D15169



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