Fix IRgen of __builtin_memset.

- Fix test case to not only have negative tests.

llvm-svn: 64674

clang/lib/CodeGen/CGBuiltin.cpp

@@ -280,7 +280,8 @@ RValue CodeGenFunction::EmitBuiltinExpr(unsigned BuiltinID, const CallExpr *E) {
   case Builtin::BI__builtin_memset: {
     Value *Address = EmitScalarExpr(E->getArg(0));
     Builder.CreateCall4(CGM.getMemSetFn(), Address,
-                        EmitScalarExpr(E->getArg(1)),
+                        Builder.CreateTrunc(EmitScalarExpr(E->getArg(1)),
+                                            llvm::Type::Int8Ty),
                         EmitScalarExpr(E->getArg(2)),
                         llvm::ConstantInt::get(llvm::Type::Int32Ty, 1));
     return RValue::get(Address);

clang/test/CodeGen/builtin-memfns.c

@@ -1,4 +1,8 @@
-// RUN: clang -emit-llvm -o - %s | not grep __builtin
+// RUN: clang -arch i386 -emit-llvm -o %t %s &&
+// RUN: grep '@llvm.memset.i32' %t &&
+// RUN: grep '@llvm.memcpy.i32' %t &&
+// RUN: grep '@llvm.memmove.i32' %t &&
+// RUN: grep __builtin %t | count 0
 
 int main(int argc, char **argv) {
   unsigned char a = 0x11223344;