clang/test/Sema/ext_vector_conversions.c

   1 // RUN: %clang_cc1 -triple x86_64-apple-macos10.7.0 -fsyntax-only -verify -Wconversion %s
   2
   3 typedef __attribute__((ext_vector_type(4))) char char4;
   4 typedef __attribute__((ext_vector_type(4))) short short4;
   5 typedef __attribute__((ext_vector_type(1))) float float1;
   6
   7 static void test(void) {
   8   char4 vc4;
   9   float f;
  10   // Not allowed.  There's no splatting conversion between float and int vector,
  11   // and we don't want to bitcast f to vector-of-char (as would happen with the
  12   // old-style vector types).
  13   vc4 += f; // expected-error {{cannot convert between vector values of different size}}
  14   short4 vs4;
  15   long long ll;
  16   // This one is OK; we don't re-interpret ll as short4, rather we splat its
  17   // value, which should produce a warning about clamping.
  18   vs4 += ll; // expected-warning {{implicit conversion loses integer precision}}
  19 }