vector [Sema]. Check for proper use of 's' char prefix

(which indicates vector expression is a string of hex
values) instead of crashing in code gen. // rdar://16492792

llvm-svn: 205557

1 files changed, 1 insertions, 1 deletions

diff --git a/clang/lib/Sema/SemaExprMember.cpp b/clang/lib/Sema/SemaExprMember.cpp
index 354dfcf3896..675c69fa88f 100644
--- a/clang/lib/Sema/SemaExprMember.cpp
+++ b/clang/lib/Sema/SemaExprMember.cpp
@@ -292,7 +292,7 @@ CheckExtVectorComponent(Sema &S, QualType baseType, ExprValueKind &VK,
 
   // This flag determines whether or not CompName has an 's' char prefix,
   // indicating that it is a string of hex values to be used as vector indices.
-  bool HexSwizzle = *compStr == 's' || *compStr == 'S';
+  bool HexSwizzle = (*compStr == 's' || *compStr == 'S') && compStr[1];
 
   bool HasRepeated = false;
   bool HasIndex[16] = {};