From: Richard Henderson <rth@twiddle.net>
To: Martin Dalecki <dalecki@evision-ventures.com>
Cc: tytso@mit.edu, Jakub Jelinek <jakub@redhat.com>,
Horst von Brand <vonbrand@sleipnir.valparaiso.cl>,
linux-kernel@vger.kernel.org
Subject: Re: 2.4.0-test10-pre6: Use of abs()
Date: Thu, 2 Nov 2000 11:37:26 -0800 [thread overview]
Message-ID: <20001102113726.A19505@twiddle.net> (raw)
In-Reply-To: <200010281629.e9SGTah07672@sleipnir.valparaiso.cl> <39FD7F2C.9A3F3976@evision-ventures.com> <20001030081938.K6207@devserv.devel.redhat.com> <39FD9E6A.AD10E699@evision-ventures.com> <20001101094619.A15283@trampoline.thunk.org> <20001101102216.A18206@twiddle.net> <3A015AB9.D3B80830@evision-ventures.com>
In-Reply-To: <3A015AB9.D3B80830@evision-ventures.com>
On Thu, Nov 02, 2000 at 01:14:49PM +0100, Martin Dalecki wrote:
> However what's the difference in respect of optimization between
> unrolling the abs function by hand and relying on the built in?
Should be nothing. The expanded source expression should get
folded immediately to an ABS_EXPR node, at which point you are
at exactly the same point as the builtin would have gotten you.
r~
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next prev parent reply other threads:[~2000-11-02 19:54 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-10-28 16:29 2.4.0-test10-pre6: Use of abs() Horst von Brand
2000-10-30 14:01 ` Martin Dalecki
2000-10-30 13:19 ` Jakub Jelinek
2000-10-30 16:14 ` Martin Dalecki
2000-11-01 14:46 ` tytso
2000-11-01 18:22 ` Richard Henderson
2000-11-02 12:14 ` Martin Dalecki
2000-11-02 19:37 ` Richard Henderson [this message]
2000-11-02 3:02 ` Theodore Y. Ts'o
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