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[Bug rtl-optimization/50101] GCC 4.5 and 4.6 generate suboptimal code on ppc for countdown loops when the CTR register cannot be used
- 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, 17 Aug 2011 08:10:03 +0000
- Subject: [Bug rtl-optimization/50101] GCC 4.5 and 4.6 generate suboptimal code on ppc for countdown loops when the CTR register cannot be used
- Auto-submitted: auto-generated
- References: <bug-50101-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50101
--- Comment #2 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-08-17 08:10:03 UTC ---
I suppose the CTR is introduced after RA in machine-dependent reorg? In which
case can the issue be fixed on branches by adjusting register cost of the CTR?