jit: fix segfault with autovectorization (PR tree-optimization/46805)

libgccjit ran into its own version of PR tree-optimization/46805 (seen
with the Go frontend); this patch fixes it in the same way.

gcc/jit/ChangeLog:
	PR tree-optimization/46805
	* dummy-frontend.c (jit_langhook_parse_file): Handle vector types.

gcc/testsuite/ChangeLog:
	PR tree-optimization/46805
	* jit.dg/all-non-failing-tests.h: Add test-autovectorize.c.
	* jit.dg/test-autovectorize.c: New test case.

From-SVN: r251192

gcc/jit/ChangeLog

 2017-08-18  David Malcolm  <dmalcolm@redhat.com>
 
+	PR tree-optimization/46805
+	* dummy-frontend.c (jit_langhook_parse_file): Handle vector types.
+
+2017-08-18  David Malcolm  <dmalcolm@redhat.com>
+
 	* jit-recording.c (class gcc::jit::reproducer): Rename field
 	"m_identifiers" to "m_map_memento_to_identifier".  Add field
 	"m_set_identifiers" and struct hash_traits for it.

gcc/jit/dummy-frontend.c

@@ -165,6 +165,17 @@ jit_langhook_parse_file (void)
 static tree
 jit_langhook_type_for_mode (machine_mode mode, int unsignedp)
 {
+  /* Build any vector types here (see PR 46805).  */
+  if (VECTOR_MODE_P (mode))
+    {
+      tree inner;
+
+      inner = jit_langhook_type_for_mode (GET_MODE_INNER (mode), unsignedp);
+      if (inner != NULL_TREE)
+	return build_vector_type_for_mode (inner, mode);
+      return NULL_TREE;
+    }
+
   if (mode == TYPE_MODE (float_type_node))
     return float_type_node;
 

gcc/testsuite/ChangeLog

+2017-08-18  David Malcolm  <dmalcolm@redhat.com>
+
+	PR tree-optimization/46805
+	* jit.dg/all-non-failing-tests.h: Add test-autovectorize.c.
+	* jit.dg/test-autovectorize.c: New test case.
+
 2017-08-18  Peter Bergner  <bergner@vnet.ibm.com>
 
 	PR target/80210

gcc/testsuite/jit.dg/all-non-failing-tests.h

@@ -50,6 +50,13 @@
 #undef create_code
 #undef verify_code
 
+/* test-autovectorize.c */
+#define create_code create_code_autovectorize
+#define verify_code verify_code_autovectorize
+#include "test-autovectorize.c"
+#undef create_code
+#undef verify_code
+
 /* test-calling-external-function.c */
 #define create_code create_code_calling_external_function
 #define verify_code verify_code_calling_external_function
@@ -267,6 +274,9 @@ const struct testcase testcases[] = {
   {"arrays",
    create_code_arrays,
    verify_code_arrays},
+  {"autovectorize",
+   create_code_autovectorize,
+   verify_code_autovectorize},
   {"calling_external_function",
    create_code_calling_external_function,
    verify_code_calling_external_function},