[Bug rtl-optimization/21461] [3.4/4.0 regression] miscompilation at -O2 in 3.4.x, 4.x
--- Additional Comments From pinskia at gcc dot gnu dot org 2005-06-05 09:17 --- Reopening to ... -- What|Removed |Added Status|RESOLVED|UNCONFIRMED Resolution|INVALID | http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21461
[Bug rtl-optimization/21461] [3.4/4.0 regression] miscompilation at -O2 in 3.4.x, 4.x
--- Additional Comments From pinskia at gcc dot gnu dot org 2005-06-05 09:18 --- Mark as a dup of bug 21920. *** This bug has been marked as a duplicate of 21920 *** -- What|Removed |Added Status|UNCONFIRMED |RESOLVED Resolution||DUPLICATE http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21461
[Bug rtl-optimization/21461] [3.4/4.0 regression] miscompilation at -O2 in 3.4.x, 4.x
--- Additional Comments From belyshev at depni dot sinp dot msu dot ru 2005-05-09 11:30 --- Could you please post backtrace of segfault? with both gcc-4.0 and gcc-3.4 if it is different. -- What|Removed |Added Component|c |rtl-optimization Keywords||wrong-code Known to work||3.3.6 Summary|miscompilation at -O2 in|[3.4/4.0 regression] |3.4.x, 4.x |miscompilation at -O2 in ||3.4.x, 4.x http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21461
[Bug rtl-optimization/21461] [3.4/4.0 regression] miscompilation at -O2 in 3.4.x, 4.x
--- Additional Comments From pinskia at gcc dot gnu dot org 2005-05-09 12:01 --- Does -fno-strict-aliasing fix the problem? Also is there any warnings from -Wstrict-aliasing? If so this might not be a bug in gcc. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21461
[Bug rtl-optimization/21461] [3.4/4.0 regression] miscompilation at -O2 in 3.4.x, 4.x
--- Additional Comments From duraid at octopus dot com dot au 2005-05-09 12:20 --- (In reply to comment #3) Does -fno-strict-aliasing fix the problem? Yes, oops. Also is there any warnings from -Wstrict-aliasing? No. If so this might not be a bug in gcc. Indeed. Sorry! -- What|Removed |Added Status|UNCONFIRMED |RESOLVED Resolution||INVALID http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21461
[Bug rtl-optimization/21461] [3.4/4.0 regression] miscompilation at -O2 in 3.4.x, 4.x
--- Additional Comments From duraid at octopus dot com dot au 2005-05-09 12:24 --- Actually, I shouldn't have closed this so hastily. The code _is_ pretty dirty but I'm not sure GCC is really doing something legal at -O2. -- What|Removed |Added Status|RESOLVED|UNCONFIRMED Resolution|INVALID | http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21461
[Bug rtl-optimization/21461] [3.4/4.0 regression] miscompilation at -O2 in 3.4.x, 4.x
--- Additional Comments From belyshev at depni dot sinp dot msu dot ru 2005-05-09 13:23 --- yes, please do not close this bug as i can reproduce it even with -fno-strict-aliasing, but it seems it breaks at least in four files (dfgparser.c, list.c, sharing.c, subst.c) so it could take some time to reduce. I'd like to see your backtrace of segfault to compare with. (compile it with -O2 -g, and do gdb --args ./a.out bug_trigger and then 'run' and 'bt') -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21461
[Bug rtl-optimization/21461] [3.4/4.0 regression] miscompilation at -O2 in 3.4.x, 4.x
--- Additional Comments From duraid at octopus dot com dot au 2005-05-09 13:41 --- Building on ia64 with the 3.4.4 compiler mentioned above, I get: #0 red_ReduceInput (Search=0x600ac338, ClauseList=0x60112e18) at clause.h:525 #1 0x4010dd90 in top_ProofSearch (Search=0x600ac338, ProblemClauses=0x60123f68, InputFlags=0x600cd948, UserPrecedence=0x0, BoundApplied=0x6fcf3768) at top.c:913 #2 0x40111350 in main (argc=2, argv=0x0) at top.c:1457 -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21461
[Bug rtl-optimization/21461] [3.4/4.0 regression] miscompilation at -O2 in 3.4.x, 4.x
--- Additional Comments From belyshev at depni dot sinp dot msu dot ru 2005-05-09 17:45 --- This code: memory.h:413: *(POINTER *)Freepointer = memory_ARRAY[Size]-free; memory_ARRAY[Size]-free = Freepointer; is invalid, because you are changing object of some type via pointer of type (void **). Either it should be rewritten using unions, or -fno-strict-aliasing option should be used. More on this here: http://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html#index-fstrict_002daliasing-524 -- What|Removed |Added Status|UNCONFIRMED |RESOLVED Resolution||INVALID http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21461
