Don't pass booleans as mask types to simd clones (PR 92710)

In this PR we assigned a vector mask type to the result of a comparison
and then tried to pass that mask type to a simd clone, which expected
a normal (non-mask) type instead.

This patch simply punts on call arguments that have a mask type.
A better fix would be to pattern-match the comparison to a COND_EXPR,
like we would if the comparison was stored to memory, but doing that
isn't gcc 9 or 10 material.

Note that this doesn't affect x86_64-linux-gnu because the ABI promotes
bool arguments to ints.

2019-11-29  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	PR tree-optimization/92710
	* tree-vect-stmts.c (vectorizable_simd_clone_call): Reject
	vector mask arguments.

gcc/testsuite/
	PR tree-optimization/92710
	* gcc.dg/vect/pr92710.c: New test.

From-SVN: r278839

gcc/ChangeLog

+2019-11-29  Richard Sandiford  <richard.sandiford@arm.com>
+
+	PR tree-optimization/92710
+	* tree-vect-stmts.c (vectorizable_simd_clone_call): Reject
+	vector mask arguments.
+
 2019-11-29  Jan Hubicka  <hubicka@ucw.cz>
 
 	* profile-count.c (profile_count::to_cgraph_frequency,

gcc/testsuite/ChangeLog

+2019-11-29  Richard Sandiford  <richard.sandiford@arm.com>
+
+	PR tree-optimization/92710
+	* gcc.dg/vect/pr92710.c: New test.
+
 2019-11-29 Tobias Burnus  <tobias@codesourcery.com>
 
 	PR ipa/84963

gcc/testsuite/gcc.dg/vect/pr92710.c

+/* { dg-do compile } */
+/* { dg-additional-options "-fopenmp-simd" } */
+
+#pragma omp declare simd
+_Bool foo (_Bool) __attribute__((const));
+
+void
+f (_Bool *restrict x, char *restrict y, char *restrict z)
+{
+  for (int i = 0; i < 128; ++i)
+    x[i] = foo (y[i] == z[i]);
+}

gcc/tree-vect-stmts.c

@@ -3925,7 +3925,16 @@ vectorizable_simd_clone_call (stmt_vec_info stmt_info,
 	  || thisarginfo.dt == vect_external_def)
 	gcc_assert (thisarginfo.vectype == NULL_TREE);
       else
-	gcc_assert (thisarginfo.vectype != NULL_TREE);
+	{
+	  gcc_assert (thisarginfo.vectype != NULL_TREE);
+	  if (VECTOR_BOOLEAN_TYPE_P (thisarginfo.vectype))
+	    {
+	      if (dump_enabled_p ())
+		dump_printf_loc (MSG_MISSED_OPTIMIZATION, vect_location,
+				 "vector mask arguments are not supported\n");
+	      return false;
+	    }
+	}
 
       /* For linear arguments, the analyze phase should have saved
 	 the base and step in STMT_VINFO_SIMD_CLONE_INFO.  */