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better performance on 64-bit mingw
- From: "Timothy C Prince" <tprince at myrealbox dot com>
- To: fortran at gcc dot gnu dot org
- Date: Tue, 04 Dec 2007 18:16:38 +0000
- Subject: better performance on 64-bit mingw
- Reply-to: tprince at computer dot org
I noticed that eoshift, pack, and unpack run several times as fast on mingw 64-bit, compared with cygwin 32-bit or linux 32 and 64-bit (on Core 2 Duo). Profiling on linux 64-bit, I see the time is spent in non-optimized memcpy(). Is this a recognized finding?
Maybe it won't be so bad on other CPUs. I will try to see if it is possible to build libgfortran with another memcpy().
Tim Prince