[Bug fortran/53950] [4.7/4.8/4.9 Regression] 1.5 times slowdown from 4.4.0 to 4.7.0 with -m32
dominiq at lps dot ens.fr
gcc-bugzilla@gcc.gnu.org
Mon Jun 17 17:22:00 GMT 2013
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53950
Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|WAITING |NEW
Summary|1.5 times slowdown from |[4.7/4.8/4.9 Regression]
|4.4.0 to 4.7.0 |1.5 times slowdown from
| |4.4.0 to 4.7.0 with -m32
--- Comment #5 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
On a Core2Duo 2.5Ghz under x86_64-apple-darwin10, I get
-m64 -m32
4.9.0 1.9743720 2.2397862
4.8.1 2.0542710 2.2539010
4.7.3 1.9538360 2.2104399
4.6.4 1.9587610 2.1613581
4.5.4 2.0137279 2.3153970
4.4.7 1.9963471 1.9965631
Note that with 4.8 and trunk, I had to change slightly the code otherwise the
loop is optimized out.
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