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[Bug optimization/13653] [3.3 regression] -O2 -funroll-loop miscompiles POOMA testcase
- From: "rguenth at tat dot physik dot uni-tuebingen dot de" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 18 Jan 2004 13:23:46 -0000
- Subject: [Bug optimization/13653] [3.3 regression] -O2 -funroll-loop miscompiles POOMA testcase
- References: <20040112101346.13653.rguenth@tat.physik.uni-tuebingen.de>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Additional Comments From rguenth at tat dot physik dot uni-tuebingen dot de 2004-01-18 13:23 -------
Subject: Re: [3.3 regression] -O2 -funroll-loop
miscompiles POOMA testcase
On Sun, 18 Jan 2004, dberlin at gcc dot gnu dot org wrote:
> Just a progress update
> This is taking a while to minimize because it takes 40 seconds per compile at the current length
> and i do two compiles per minimize, to make sure it works at -O2 but breaks with -O2 -funroll-
> loops.
> It'll probably be another few days before it's minimal.
> But it's already gotten 25% smaller
Many thanks for doing this work! Couldn't tree-ssa be used to re-produce
sourcecode after DCE? Or even just using cgraph for detecting completely
unused classes/methods? (I thought of using the symbol table of a -O0
compile to extract used stuff, but that requires a C++ parser again...)
Richard.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13653