[Bug rtl-optimization/38921] [4.3 Regression] NULL access in delay-slot

[rakdver at gcc dot gnu dot org]

------- Comment #6 from rakdver at gcc dot gnu dot org  2009-01-21 16:41 -------
(In reply to comment #4)
> Zdenek, could you please comment on comment #3?
> 

Adding MTP_AFTER_MOVE seems like the right thing to do; after all, even the
comments for may_trap_or_fault_p specify that it should behave the same way as
may_trap_after_code_motion_p (except for also looking for misaligned memory
references).

However, I suspect that all the places that use may_trap_after_code_motion_p in
fact expect it to have MTP_AFTER_MOVE | MTP_UNALIGNED_MEMS semantics as well. 
So I would propose to merge may_trap_or_fault_p and
may_trap_after_code_motion_p to one function (and replace the checks for
MTP_UNALIGNED_MEMS in may_trap_p_1 by MTP_AFTER_MOVE, as they IMHO handle
different instances of the same problem -- the code that does not fail at its
current location, but may fail elsewhere).


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38921