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unexpected speedup from gcc-4.1-20050508
- From: tbp <tbptbp at gmail dot com>
- To: GCC Mailing List <gcc at gcc dot gnu dot org>, Uros Bizjak <uros at kss-loka dot si>
- Date: Mon, 9 May 2005 15:50:31 +0200
- Subject: unexpected speedup from gcc-4.1-20050508
- Reply-to: tbp <tbptbp at gmail dot com>
Hello,
after setting up the latest snapshot, i was caught off guard as all my
numbers were off (and usually it's better than a swiss clock).
So, i've double checked, stripped some cruft from compiler command
line and pitted various snapshots (20050410, 20050424, 20050501) vs
20050508 in my app.
Now i can say without doubt that on x86-64 linux, on a k8, i reliably
get between >3% (rendering path, mostly vectorized SSE) and >5%
(kd-tree compiler, branchy & memory heavy code) performance boost.
Without touching a single line of code.
I don't know, yet, who's the unsung hero i should thank or what he/she
did, or if that result can be correlated in any other benchmark, but
that won't stop me to send my warmest kudos his/her way.
Feel free to fill in the blanks :)
Regards.