When initializing struct members, the important thing is that the "initializing" expression is

compatible, not having the same type.

Fix rdar://8183908 in which compatible vector types weren't initialized properly leading to a crash.

llvm-svn: 124637

clang/lib/Sema/SemaInit.cpp

@@ -697,7 +697,8 @@ void InitListChecker::CheckSubElementType(const InitializedEntity &Entity,
       //   initial value of the object, including unnamed members, is
       //   that of the expression.
       if ((ElemType->isRecordType() || ElemType->isVectorType()) &&
-          SemaRef.Context.hasSameUnqualifiedType(expr->getType(), ElemType)) {
+          SemaRef.CheckSingleAssignmentConstraints(ElemType, expr)
+              == Sema::Compatible) {
         SemaRef.DefaultFunctionArrayLvalueConversion(expr);
         UpdateStructuredListElement(StructuredList, StructuredIndex, expr);
         ++Index;

clang/test/CodeGen/struct-init.c

@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 %s -emit-llvm -o -
+// RUN: %clang_cc1 %s -emit-llvm-only
 
 typedef struct _zend_ini_entry zend_ini_entry;
 struct _zend_ini_entry {
@@ -18,3 +18,14 @@ struct GLGENH {
 };
 
 struct GLGENH ABHFBF = {1};
+
+typedef __attribute__(( ext_vector_type(2) )) unsigned int uint2;
+typedef __attribute__(( __vector_size__(8) )) unsigned int __neon_uint32x2_t;
+
+// rdar://8183908
+typedef struct __simd64_uint32_t {
+  __neon_uint32x2_t val;
+} uint32x2_t;
+void foo() {
+    const uint32x2_t signBit = { (uint2) 0x80000000 };
+}