re PR c++/68180 ([ICE] at cp/constexpr.c:2768 in initializing __vector in a loop)

2016-11-17  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/68180
	* g++.dg/cpp1y/pr68180.C: New.

From-SVN: r242541

gcc/testsuite/ChangeLog

+2016-11-17  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/68180
+	* g++.dg/cpp1y/pr68180.C: New.
+
 2016-11-17  Prathamesh Kulkarni  <prathamesh.kulkarni@linaro.org>
 
 	PR tree-optimization/78319

gcc/testsuite/g++.dg/cpp1y/pr68180.C

+// PR c++/68180
+// { dg-do compile { target c++14 } }
+
+typedef float __attribute__( ( vector_size( 16 ) ) ) float32x4_t;
+constexpr float32x4_t fill(float x) {
+  float32x4_t v{0};
+  constexpr auto vs = sizeof(v)/sizeof(v[0]);
+  for (auto i=0U; i<vs; ++i) v[i]=i;
+  return v+x;
+}
+
+float32x4_t foo(float32x4_t x) {
+  constexpr float32x4_t v = fill(1.f); // { dg-error "not a constant" }
+  return x+v;
+}