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On 10/20/2010 7:48 PM, Jie Zhang wrote:Thanks for testing! Seems rs6000 port still has to keep that hack for now.Running CPU2006, with the hack removed I see about a 1% improvement in specint (10% in 456.hmmer, a couple others in the 3% range, -3% 401.bzip2) and a 1% degradation in specfp (mainly due to a 13% degradation in 435.gromacs). But 454.calculix also fails for me (output miscompare), so assume we're generating incorrect code for some reason with the hack removed.
Thanks for benchmarking! Since there is a bug in max_issue, issue_rate is not really honored. Could you try this patch
http://gcc.gnu.org/ml/gcc-patches/2010-10/msg01719.html
with and without the hack?
With your patch applied I see pretty similar results as before, except for a couple additional specint benchmarks that degraded a couple percent with the hack removed.
-- Jie Zhang CodeSourcery
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