[Bug tree-optimization/92351] [10 Regression] Wrong code with -O3 -match=skylake since r277569

2019-11-08 Thread avieira at gcc dot gnu.org 
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92351

avieira at gcc dot gnu.org changed:

   What|Removed |Added

 Status|ASSIGNED|RESOLVED
 Resolution|--- |FIXED

--- Comment #4 from avieira at gcc dot gnu.org ---
I believe the committed patch fixes this.

[Bug tree-optimization/92351] [10 Regression] Wrong code with -O3 -match=skylake since r277569

2019-11-08 Thread avieira at gcc dot gnu.org 
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92351

--- Comment #3 from avieira at gcc dot gnu.org ---
Author: avieira
Date: Fri Nov  8 13:52:56 2019
New Revision: 277974

URL: https://gcc.gnu.org/viewcvs?rev=277974=gcc=rev
Log:
[vect] PR 92351: When peeling for alignment make alignment of epilogues unknown

gcc/ChangeLog:
2019-11-08  Andre Vieira  

PR tree-optimization/92351
* tree-vect-data-refs.c (vect_compute_data_ref_alignment): When we are
peeling the main loop for alignment, make sure to set the misalignment
of the epilogue's data references to DR_MISALIGNMENT_UNKNOWN.

gcc/testsuite/ChangeLog:
2019-11-08  Andre Vieira  

PR tree-optimization/92351
* gcc.dg/vect/vect-peel-2.c: Disable epilogue vectorization and
split the source of this test to...
* gcc.dg/vect/vect-peel-2-src.c: ... This.
* gcc.dg/vect/vect-peel-2-epilogues.c: New test.

Added:
trunk/gcc/testsuite/gcc.dg/vect/vect-peel-2-epilogues.c
trunk/gcc/testsuite/gcc.dg/vect/vect-peel-2-src.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.dg/vect/vect-peel-2.c
trunk/gcc/tree-vect-data-refs.c

[Bug tree-optimization/92351] [10 Regression] Wrong code with -O3 -match=skylake since r277569

2019-11-05 Thread marxin at gcc dot gnu.org 
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92351

--- Comment #2 from Martin Liška  ---
Using -fdbg-cnt=vect_loop:4:6 will reduce vectorizer to one vectorization + one
epilogue vectorization that causes the miscompilation.

[Bug tree-optimization/92351] [10 Regression] Wrong code with -O3 -match=skylake since r277569

2019-11-04 Thread marxin at gcc dot gnu.org 
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92351

--- Comment #1 from Martin Liška  ---
Created attachment 47165
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47165=edit
test-case

[Bug tree-optimization/92351] [10 Regression] Wrong code with -O3 -match=skylake since r277569

2019-11-04 Thread marxin at gcc dot gnu.org 
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92351

Martin Liška  changed:

   What|Removed |Added

 Status|UNCONFIRMED |ASSIGNED
   Last reconfirmed||2019-11-04
  Known to work||9.2.0
   Assignee|unassigned at gcc dot gnu.org  |avieira at gcc dot 
gnu.org
   Target Milestone|--- |10.0
 Ever confirmed|0   |1
  Known to fail||10.0