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Re: Patch to fix gcc.c-torture/compile/20010102-1.c on IA64 HP-UX
- From: Jeff Law <law at redhat dot com>
- To: luisgpm at linux dot vnet dot ibm dot com
- Cc: sje at cup dot hp dot com, Richard Henderson <rth at redhat dot com>, Peter Bergner <bergner at vnet dot ibm dot com>, gcc-patches at gcc dot gnu dot org, paolo dot carlini at oracle dot com
- Date: Fri, 03 Oct 2008 18:40:29 -0600
- Subject: Re: Patch to fix gcc.c-torture/compile/20010102-1.c on IA64 HP-UX
- References: <200809161651.m8GGpEM19079@lucas.cup.hp.com> <1221589231.6367.14.camel@sjoa> <email@example.com> <48D005A1.firstname.lastname@example.org> <1221593957.6367.24.camel@sjoa> <48D013ED.email@example.com> <firstname.lastname@example.org> <48D0248E.email@example.com> <firstname.lastname@example.org> <48D2B834.email@example.com> <firstname.lastname@example.org> <48D953DC.email@example.com> <firstname.lastname@example.org> <1223062006.612.13.camel@gargoyle>
Luis Machado wrote:
Hi,I'd be hard pressed to see how this patch could cause any kind of
performance regression since it's merely propagating information to the
backend that was getting lost in regrename and I don't see that the ppc
uses REG_POINTER in its backend.
I've noticed a 3% performance degradation on CPU2000's vortex (32-bit)
with PEAK flags on PPC (POWER6) after this patch went in. Still
investigating what slowed it down, will post more information soon.