From: Bojan Bozovic <bozovic.bojan@gmail.com>
To: Jonathan Wakely <jwakely.gcc@gmail.com>
Cc: gcc-help <gcc-help@gcc.gnu.org>
Subject: Re: I can't make Bugzilla account and there is possible GCC Ada (GNAT) bug in optimizing the code - ada.numerics.real_arrays Real_Matrix multiplication slower than doing things 'by hand'. I attached code.
Date: Mon, 19 Feb 2018 17:18:00 -0000 [thread overview]
Message-ID: <CACimChUKAp0ccd3PgE46UyU8oaYw-z6o=YLwM2cLhjAB=xuQTQ@mail.gmail.com> (raw)
In-Reply-To: <CAH6eHdRJPC=t03pJ+UXEMeU0g-votAHUFxMzbLs=EnrctRp6Fg@mail.gmail.com>
My email got rejected when I tried to get bugzilla account manually.
Anyway this is confirmed not a bug just instantiating with : package
R_A is new Ada.Numerics.Generic_Real_Arrays (Float); use R_A; makes
code run comparable to coding multiplication by hand (and GCC C code).
It's just run time library isn't compiled with aggressive
optimizations (-O3 -march=skylake for x86_64 or -O3 -mavx2 for i686).
On Mon, Feb 19, 2018 at 4:47 PM, Jonathan Wakely <jwakely.gcc@gmail.com> wrote:
> If you want a bugzilla account then you should send an email to the
> address that Bugzilla tells you to contact.
next prev parent reply other threads:[~2018-02-19 17:18 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-18 4:01 Bojan Bozovic
2018-02-19 15:47 ` Jonathan Wakely
2018-02-19 17:18 ` Bojan Bozovic [this message]
2018-02-19 18:06 ` Jonathan Wakely
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