Committed: skip gcc.dg/pr46309.c for CRIS

[Hans-Peter Nilsson]

This patch "fixes" a regression on trunk and the 4.8 branch:

Running /tmp/hpautotest-gcc48/gcc/gcc/testsuite/gcc.dg/dg.exp ...
...
FAIL: gcc.dg/pr46309.c scan-tree-dump-times reassoc2 "Optimizing range tests [^\r\n]*_[0-9]* -.0, 31. and -.128, 159.[\n\r]* into" 1

The comment in the test seen in the context indicates that it
depends on BRANCH_COST > 1.  As all cris*-*-* have BRANCH_COST 1
(with no option that set it higher), the only reasonable option
seems to skip the test.  A FAIL for this test seems only also
noticed for MIPS, AVR and s390; the test sets options to change
branch-cost to 2 for those targets (IMHO unconventional to have
an option exactly for this purpose) in the lines below the patch
context.

That the test has ever PASSed thus seemed weird so I looked in
my logs.  The test hasn't always passed for CRIS: it started
passing on trunk at (193019:193029] (before the 4.8 branch;
2012-10-31) which includes a commit with a follow-up for PR46309
with more test-coverage (without BRANCH_COST notes).  The
test-case gcc.dg/pr46309.c was not touched at that time and any
PASS effect for targets with BRANCH_COST=1 seems only
incidental.  It started failing for trunk at (206454:206460] and
on 4.8-branch at (206507:206513] whose intersection has:

+2014-01-09  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/59715
+	* tree-cfg.h (split_critical_edges): Declare.
+	* tree-cfg.c (split_critical_edges): Export.
+	* tree-ssa-sink.c (execute_sink_code): Split critical edges.
+

and the effect of the test failing seems as incidental as when
it started to pass.  BTW, I verified that setting BRANCH_COST to
2 indeed makes the test pass for cris-elf, which of course by
itself is not an acceptable fix.

I know there's a redundant {} level there, but it won't be
redundant if adding targets to that list, still if there are
more tests like this maybe it's worthwhile to consider adding
an effective-target branch_cost_gt_1 or something.

gcc/testsuite:
	* gcc.dg/pr46309.c: Disable for cris*-*-*.

Index: gcc/testsuite/gcc.dg/pr46309.c
===================================================================
--- gcc/testsuite/gcc.dg/pr46309.c	(revision 206534)
+++ gcc/testsuite/gcc.dg/pr46309.c	(working copy)
@@ -1,5 +1,5 @@
 /* PR tree-optimization/46309 */
-/* { dg-do compile } */
+/* { dg-do compile { target { ! { cris*-*-* } } } } */
 /* { dg-options "-O2 -fdump-tree-reassoc-details" } */
 /* The transformation depends on BRANCH_COST being greater than 1
    (see the notes in the PR), so try to force that.  */

Anyway, enough with the commentary, committed to trunk and 4.8-branch.

brgds, H-P