Fix the equal-vector-size rule for reinterpret_casts in C++

to consider the storage size of the vector instead of its
sizeof.  In other words, ban <3 x int> to <4 x int> casts,
which produced invalid IR anyway.

Also, attempt to be a little more rigorous, or at least
explicit, about when enums are allowed in these casts.

rdar://21901132

llvm-svn: 243069

1 files changed, 8 insertions, 0 deletions

diff --git a/clang/test/Sema/vector-cast.c b/clang/test/Sema/vector-cast.c
index 0415c13990c..03db5408c45 100644
--- a/clang/test/Sema/vector-cast.c
+++ b/clang/test/Sema/vector-cast.c
@@ -3,12 +3,20 @@
 typedef long long t1 __attribute__ ((vector_size (8)));
 typedef char t2 __attribute__ ((vector_size (16)));
 typedef float t3 __attribute__ ((vector_size (16)));
+typedef short s2 __attribute__ ((vector_size(4)));
+
+typedef enum { Evalue = 0x10000 } E;
 
 void f()
 {  
   t1 v1;
   t2 v2;
   t3 v3;
+  s2 v4;
+  E e;
+
+  e = (E)v4;
+  v4 = (s2)e;
   
   v2 = (t2)v1; // expected-error {{invalid conversion between vector type \
 't2' (vector of 16 'char' values) and 't1' (vector of 1 'long long' value) of different size}}