Check compatibility of vector types using their canonicalizations.

Fixes an assertion arising C overload analysis, but really I can't imagine
that this wouldn't cause a thousand other uncaught failures.

Fixes PR6600.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@98400 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 12 insertions, 2 deletions

diff --git a/lib/AST/ASTContext.cpp b/lib/AST/ASTContext.cpp
index ea121165fc..c64f97a97f 100644
--- a/lib/AST/ASTContext.cpp
+++ b/lib/AST/ASTContext.cpp
@@ -4736,7 +4736,8 @@ QualType ASTContext::mergeTypes(QualType LHS, QualType RHS) {
     return QualType();
   case Type::Vector:
     // FIXME: The merged type should be an ExtVector!
-    if (areCompatVectorTypes(LHS->getAs<VectorType>(), RHS->getAs<VectorType>()))
+    if (areCompatVectorTypes(LHSCan->getAs<VectorType>(),
+                             RHSCan->getAs<VectorType>()))
       return LHS;
     return QualType();
   case Type::ObjCInterface: {
diff --git a/test/Sema/overloadable.c b/test/Sema/overloadable.c
index ff631ed9c8..28c3e4cf8c 100644
--- a/test/Sema/overloadable.c
+++ b/test/Sema/overloadable.c
@@ -50,4 +50,13 @@ void test_promote(short* sp) {
   promote(sp); // expected-error{{call to unavailable function 'promote'}}
 }
 
-
+// PR6600
+typedef double Double;
+typedef Double DoubleVec __attribute__((vector_size(16)));
+typedef int Int;
+typedef Int IntVec __attribute__((vector_size(16)));
+double magnitude(DoubleVec) __attribute__((__overloadable__));
+double magnitude(IntVec) __attribute__((__overloadable__));
+double test_p6600(DoubleVec d) {
+  return magnitude(d) * magnitude(d);
+}