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Serious SPEC CPU 2006 FP performance regressions on IA32
- From: "H. J. Lu" <hjl at lucon dot org>
- To: gcc at gcc dot gnu dot org
- Cc: evandro dot menezes at amd dot com, ubizjak at gmail dot com
- Date: Fri, 8 Dec 2006 10:05:50 -0800
- Subject: Serious SPEC CPU 2006 FP performance regressions on IA32
Gcc 4.3 revision 119497 has very poor SPEC CPU 2006 FP performance
regressions on P4, Pentium M and Core Duo, comparing aganst
gcc 4.2 20060910. With -O2, the typical regressions look like
Gcc 4.2 Gcc 4.3
410.bwaves 9.89 9.14 -7.58342%
416.gamess 7.17 7.16 -0.13947%
433.milc 7.68 7.65 -0.390625%
434.zeusmp 5.57 5.55 -0.359066%
435.gromacs 3.99 4.02 0.75188%
436.cactusADM 4.59 4.50 -1.96078%
437.leslie3d 5.78 3.98 -31.1419%
444.namd 6.25 6.18 -1.12%
447.dealII 11.3 11.3 0%
450.soplex 8.61 8.59 -0.232288%
453.povray 6.70 6.72 0.298507%
454.calculix 2.81 2.74 -2.4911%
459.GemsFDTD 6.07 4.95 -18.4514%
465.tonto 4.44 4.45 0.225225%
470.lbm 10.6 10.7 0.943396%
481.wrf 4.56 4.50 -1.31579%
482.sphinx3 11.2 11.1 -0.892857%
Est. SPECfp_base2006 6.42 6.15 -4.20561%
Evandro, what do you get on AMD?
Is that related to recent i386 backend FP changes?
H.J.