[patch] enabling vectorization by default at -O3

Uros Bizjak ubizjak@gmail.com
Thu Sep 6 12:12:00 GMT 2007


Hello!

>            NV     V       NV.F    V.F      V.CM   V.CM.F
> --------------------------------------------------------
> ac        15.19  15.09+   12.72  12.74-   15.02+  12.71+
> aermod    36.50  36.72-   35.62  35.97-   36.25+  35.34+
> air       12.78  12.56+    9.65   9.48+   12.34+   9.49=
> capacita  50.43  49.48+   48.88  50.59-   48.43+  49.59+
> channel    3.20   2.79++   3.13   2.80++   2.72+   2.71+
> doduc     56.23  55.87+   48.84  49.34-   55.48+  48.85+
> fatigue   13.94  14.10-   12.37  12.77-   13.62+  12.69+
> gas_dyn   24.98  10.45++  19.64   7.96++  10.40+   7.93+
> induct    64.52  63.77+   66.47* 88.56--  63.50+  63.92++
> linpk     22.39  22.79-   22.10  22.31-   22.12+  22.10+
> mdbx      16.36  16.22+   18.86* 19.10-   16.16+  18.95+
> nf        27.71  27.67+   27.55  27.27+   27.12+  26.84+
> protein   61.86  61.99-   60.57  59.96+   62.40-  59.76+
> rnflow    35.88  35.92-   35.49  35.58+   35.82+  35.46+
> test_fpu  15.37  14.10+   15.80  13.40+   14.18-  13.23+
> tfft       2.89   2.86     2.98   3.00-    2.82+   2.90+
> --------------------------------------------------------
> Geo.Mean  21.02  19.57+   19.92  18.93    19.34+  18.34+
>
> * Hmm, why is --ffast-math slower? And with vectorization that much
> slower? I recheck induct (V.F, NV.F) and I could reproduce the timings.
>

> that is indeed interesting (I'd be happy to look at a testcase)

This is PR 32084, http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32084

Uros.



More information about the Gcc-patches mailing list