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[Bug tree-optimization/27799] adding unused char field inhibits optimization
- From: "dann at godzilla dot ics dot uci dot edu" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 4 Mar 2008 21:32:30 -0000
- Subject: [Bug tree-optimization/27799] adding unused char field inhibits optimization
- References: <bug-27799-1008@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #7 from dann at godzilla dot ics dot uci dot edu 2008-03-04 21:32 -------
(In reply to comment #6)
> Actually RTL alias is just using the same routines.
Might be, but the RTL level code that optimizes away the abort() in both
testcases (if I remember well nonoverlapping_component_refs_p).
>
> # SMT.4_6 = VDEF <SMT.4_4(D)>
> # SMT.5_7 = VDEF <SMT.5_5(D)>
> x_1(D)->x = 0;
> # SMT.5_8 = VDEF <SMT.5_7>
> y_2(D)->y = 1;
>
> vs.
>
> # SMT.18_5 = VDEF <SMT.18_4(D)>
> x_1(D)->x = 0;
> # SMT.19_7 = VDEF <SMT.19_6(D)>
> y_2(D)->y = 1;
That is for this testcase, but what about the impact on .final_cleanup for
something big like combine.c?
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27799