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Re: IRA performance testing on Fortran
- From: David Edelsohn <dje at watson dot ibm dot com>
- To: FX <fxcoudert at gmail dot com>
- Cc: "Vladimir Makarov" <vmakarov at redhat dot com>, "GCC Development" <gcc at gcc dot gnu dot org>, "Fortran List" <fortran at gcc dot gnu dot org>
- Date: Mon, 12 May 2008 10:33:15 -0400
- Subject: Re: IRA performance testing on Fortran
- References: <19c433eb0805120709m30648173q5f31719aeaf6e185@mail.gmail.com>
>>>>> FX writes:
FX> The performance regression is mainly due to one testcase, induct,
FX> which is taking a 30% hit on IRA. If the performance of that one were
FX> the same with IRA than with the old allocator, the switch would be
FX> (for this benchmark) performance-neutral. So, I have investigated the
FX> case of induct, and I found that with the IRA branch compiler without
FX> -fira, it's already 30% slower than with trunk. So, is it an issue
FX> with the IRA branch, or has it just not been merged recently and we
FX> had a recent great improvement of induct on trunk? I'd appreciate if
FX> you could enlighten me on this point.
The IRA branch has not been merged recently and does not include
many of Richi's recent alias analysis improvements.
David