Re: [patch]: [Bug tree-optimization/61917] [4.9/5 Regression] ICE on valid code at -O3 on x86_64-linux-gnu in vectorizable_reduction, at tree-vect-loop.c:4913

[Alex Velenko]

On 25/02/15 16:51, H.J. Lu wrote:
On Wed, Feb 25, 2015 at 5:10 AM, Kai Tietz <ktiet...@googlemail.com> wrote:
Hello,
So, I did full regression-test for following patch:

ChangeLog

2015-02-25  Richard Biener  <rguent...@suse.de>
     Kai Tietz  <kti...@redhat.com>

     PR tree-optimization/61917
     * tree-vect-loop.c (vectorizable_reduction): Allow
     vect_internal_def without reduction to exit graceful.


I think it caused:

FAIL: gcc.dg/pr56350.c (internal compiler error)
FAIL: gcc.dg/pr56350.c (test for excess errors)

[hjl@gnu-6 gcc]$ ./xgcc -B./ -O -ftree-vectorize
/export/gnu/import/git/sources/gcc/gcc/testsuite/gcc.dg/pr56350.c
/export/gnu/import/git/sources/gcc/gcc/testsuite/gcc.dg/pr56350.c: In
function ‘f’:
/export/gnu/import/git/sources/gcc/gcc/testsuite/gcc.dg/pr56350.c:8:1:
internal compiler error: Segmentation fault
  f (void)
  ^
0xd1f836 crash_signal
/export/gnu/import/git/sources/gcc/gcc/toplev.c:383
0xfaf59a gimple_code
/export/gnu/import/git/sources/gcc/gcc/gimple.h:1553
0xfbd855 vectorizable_reduction(gimple_statement_base*,
gimple_stmt_iterator*, gimple_statement_base**, _slp_tree*)
/export/gnu/import/git/sources/gcc/gcc/tree-vect-loop.c:4987
0xfabc86 vect_analyze_stmt(gimple_statement_base*, bool*, _slp_tree*)
/export/gnu/import/git/sources/gcc/gcc/tree-vect-stmts.c:7170
0xfb50c9 vect_analyze_loop_operations
/export/gnu/import/git/sources/gcc/gcc/tree-vect-loop.c:1539
0xfb58cc vect_analyze_loop_2
/export/gnu/import/git/sources/gcc/gcc/tree-vect-loop.c:1800
0xfb5c70 vect_analyze_loop(loop*)
/export/gnu/import/git/sources/gcc/gcc/tree-vect-loop.c:1898
0xfd558f vectorize_loops()
/export/gnu/import/git/sources/gcc/gcc/tree-vectorizer.c:451
0xed3699 execute
/export/gnu/import/git/sources/gcc/gcc/tree-ssa-loop.c:295
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
[hjl@gnu-6 gcc]$


Hi,
This patch also breaks gcc.dg/pr56350.c for aarch64-none-elf, 
arm-none-eabi and other arm targets. Failure looks very similar:

src/gcc/gcc/testsuite/gcc.dg/pr56350.c: In function 'f':

src/gcc/gcc/testsuite/gcc.dg/pr56350.c:8:1: internal compiler error: 
Segmentation fault

Please submit a full bug report,

with preprocessed source if appropriate.

See <http://gcc.gnu.org/bugs.html> for instructions.

compiler exited with status 1
output is:
src/gcc/gcc/testsuite/gcc.dg/pr56350.c: In function 'f':

src/gcc/gcc/testsuite/gcc.dg/pr56350.c:8:1: internal compiler error: 
Segmentation fault

Please submit a full bug report,

with preprocessed source if appropriate.

See <http://gcc.gnu.org/bugs.html> for instructions.

Kind regards,
Alex