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[Bug rtl-optimization/23585] [4.0 regression] mem_fun* code fine with -O1, bus error with -O2
- From: "ebotcazou at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 11 Oct 2005 13:51:31 -0000
- Subject: [Bug rtl-optimization/23585] [4.0 regression] mem_fun* code fine with -O1, bus error with -O2
- References: <bug-23585-11161@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #8 from ebotcazou at gcc dot gnu dot org 2005-10-11 13:51 -------
> Yes, I think the problem is in delay slot scheduling too. COND_EXPR means that
> either branch must not be evaluated because it could be illegal; if you hoist a
> mem from a branch into the delay slot of the condition, you are effectively
> partially evaluting the branch.
Yes, that makes sense. At the moment the predicate used in reorg.c is
may_trap_p so we would need to detect faulting instructions too.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23585