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* [Bug regression/26128] New: Regression vs 4.1.0cvs20051015 - Trivial operation not vectorized @ 2006-02-06 14:55 hurbain at cri dot ensmp dot fr 2006-02-06 15:00 ` [Bug tree-optimization/26128] Trivial operation not vectorized on char pinskia at gcc dot gnu dot org ` (3 more replies) 0 siblings, 4 replies; 5+ messages in thread From: hurbain at cri dot ensmp dot fr @ 2006-02-06 14:55 UTC (permalink / raw) To: gcc-bugs char a[16] __attribute__((aligned)) = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16}; char b[16] __attribute__((aligned)) = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16}; char c[16] __attribute__((aligned)); int i; for(i = 0; i<16; i++) { c[i] = a[i] + b[i]; } for(i = 0; i<16; i++) { printf("%i ", c[i]); } This code is not vectorized anymore in GCC 4.2.0 (svn checkout on Feb, 06 2006). The vectorizer tells that : paddb4bugreport.c:14: note: vect_is_simple_use: operand (unsigned char) D.1872_47 paddb4bugreport.c:14: note: not ssa-name. paddb4bugreport.c:14: note: use not simple. paddb4bugreport.c:14: note: not vectorized: relevant stmt not supported: D.1873_48 = (unsigned char) D.1872_47 paddb4bugreport.c:14: note: bad operation or unsupported loop bound.(get_loop_exit_condition if (ivtmp.52_2 != 0) goto <L13>; else goto <L5>;) Seems to be a problem before the autovectorizer as the (unsigned char) cast should not happen IMHO. -- Summary: Regression vs 4.1.0cvs20051015 - Trivial operation not vectorized Product: gcc Version: 4.2.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: regression AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: hurbain at cri dot ensmp dot fr http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26128 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/26128] Trivial operation not vectorized on char 2006-02-06 14:55 [Bug regression/26128] New: Regression vs 4.1.0cvs20051015 - Trivial operation not vectorized hurbain at cri dot ensmp dot fr @ 2006-02-06 15:00 ` pinskia at gcc dot gnu dot org 2006-09-21 17:12 ` pinskia at gcc dot gnu dot org ` (2 subsequent siblings) 3 siblings, 0 replies; 5+ messages in thread From: pinskia at gcc dot gnu dot org @ 2006-02-06 15:00 UTC (permalink / raw) To: gcc-bugs ------- Comment #1 from pinskia at gcc dot gnu dot org 2006-02-06 15:00 ------- Actually this is a known regression and a missed optimization regression caused by fixing up wrong code. The work around is to use -fwrapv. -- pinskia at gcc dot gnu dot org changed: What |Removed |Added ---------------------------------------------------------------------------- Severity|normal |enhancement Status|UNCONFIRMED |NEW Component|regression |tree-optimization Ever Confirmed|0 |1 Keywords| |missed-optimization Last reconfirmed|0000-00-00 00:00:00 |2006-02-06 15:00:36 date| | Summary|Regression vs |Trivial operation not |4.1.0cvs20051015 - Trivial |vectorized on char |operation not vectorized | http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26128 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/26128] Trivial operation not vectorized on char 2006-02-06 14:55 [Bug regression/26128] New: Regression vs 4.1.0cvs20051015 - Trivial operation not vectorized hurbain at cri dot ensmp dot fr 2006-02-06 15:00 ` [Bug tree-optimization/26128] Trivial operation not vectorized on char pinskia at gcc dot gnu dot org @ 2006-09-21 17:12 ` pinskia at gcc dot gnu dot org 2007-06-12 17:37 ` [Bug tree-optimization/26128] Trivial operation not vectorized on char/short pinskia at gcc dot gnu dot org 2009-02-06 1:45 ` pinskia at gcc dot gnu dot org 3 siblings, 0 replies; 5+ messages in thread From: pinskia at gcc dot gnu dot org @ 2006-09-21 17:12 UTC (permalink / raw) To: gcc-bugs ------- Comment #2 from pinskia at gcc dot gnu dot org 2006-09-21 17:11 ------- *** Bug 29170 has been marked as a duplicate of this bug. *** -- pinskia at gcc dot gnu dot org changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |eplondke at gmail dot com http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26128 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/26128] Trivial operation not vectorized on char/short 2006-02-06 14:55 [Bug regression/26128] New: Regression vs 4.1.0cvs20051015 - Trivial operation not vectorized hurbain at cri dot ensmp dot fr 2006-02-06 15:00 ` [Bug tree-optimization/26128] Trivial operation not vectorized on char pinskia at gcc dot gnu dot org 2006-09-21 17:12 ` pinskia at gcc dot gnu dot org @ 2007-06-12 17:37 ` pinskia at gcc dot gnu dot org 2009-02-06 1:45 ` pinskia at gcc dot gnu dot org 3 siblings, 0 replies; 5+ messages in thread From: pinskia at gcc dot gnu dot org @ 2007-06-12 17:37 UTC (permalink / raw) To: gcc-bugs ------- Comment #3 from pinskia at gcc dot gnu dot org 2007-06-12 17:36 ------- *** Bug 32309 has been marked as a duplicate of this bug. *** -- pinskia at gcc dot gnu dot org changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |gangren at google dot com http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26128 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/26128] Trivial operation not vectorized on char/short 2006-02-06 14:55 [Bug regression/26128] New: Regression vs 4.1.0cvs20051015 - Trivial operation not vectorized hurbain at cri dot ensmp dot fr ` (2 preceding siblings ...) 2007-06-12 17:37 ` [Bug tree-optimization/26128] Trivial operation not vectorized on char/short pinskia at gcc dot gnu dot org @ 2009-02-06 1:45 ` pinskia at gcc dot gnu dot org 3 siblings, 0 replies; 5+ messages in thread From: pinskia at gcc dot gnu dot org @ 2009-02-06 1:45 UTC (permalink / raw) To: gcc-bugs ------- Comment #4 from pinskia at gcc dot gnu dot org 2009-02-06 01:45 ------- *** Bug 39068 has been marked as a duplicate of this bug. *** -- pinskia at gcc dot gnu dot org changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |dann at godzilla dot ics dot | |uci dot edu http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26128 ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2009-02-06 1:45 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2006-02-06 14:55 [Bug regression/26128] New: Regression vs 4.1.0cvs20051015 - Trivial operation not vectorized hurbain at cri dot ensmp dot fr 2006-02-06 15:00 ` [Bug tree-optimization/26128] Trivial operation not vectorized on char pinskia at gcc dot gnu dot org 2006-09-21 17:12 ` pinskia at gcc dot gnu dot org 2007-06-12 17:37 ` [Bug tree-optimization/26128] Trivial operation not vectorized on char/short pinskia at gcc dot gnu dot org 2009-02-06 1:45 ` pinskia at gcc dot gnu dot org
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