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[Bug other/63155] [4.9/5 Regression] memory hog
- From: "rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Wed, 03 Sep 2014 14:24:40 +0000
- Subject: [Bug other/63155] [4.9/5 Regression] memory hog
- Auto-submitted: auto-generated
- References: <bug-63155-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63155
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
So the issue is that the setjmp argument needs two temporaries:
D.2832 = Unity.CurrentAbortFrame;
D.2833 = &Unity.AbortFrame[D.2832];
<bb 18>:
D.2834 = _setjmp (D.2833);
and the EH edge going into the _setjmp call has to merge those through
the abnormal dispatcher. And that way it receives all of them. Hmm.
Huh. Without the abnormal dispatcher they should just get default defs
everywhere (but still many PHI nodes). Maybe that would be more light-weight.