From: martinwguy@gmail.com (Martin Guy)
To: linux-arm-kernel@lists.infradead.org
Subject: Query about Float Point Operation
Date: Mon, 29 Mar 2010 11:59:45 +0100 [thread overview]
Message-ID: <56d259a01003290359r29808e09p69d7fc8a0c4fa015@mail.gmail.com> (raw)
In-Reply-To: <d82162471003282222q5e463306rd385c3ed54879e4d@mail.gmail.com>
On 3/29/10, Rajanikanth H.V <rkiyerpersonal@gmail.com> wrote:
> 2010/3/23 ??? <914059751@qq.com>:
> > Hi , guys
> > I want to do float point operations in kernel like the following,
> >
> > int foo(double d)
> > {
> >
> > return (int)d*d;
> >
> > }
> >
> > while compiling output error msg like following:
> > cannt find eabi_dmul balabla??????
> >
> > May I ask any possibility of use float point operation in the kernel space?
> > Any hints/doc would be appreciated!
> I do not know how are you compiling the required function.
> Use hardware floating point support. If your target SOC support.
> Also verify whether Floating Point Emulation -> VFP is enabled in your config.
Wrong. You cannot do floating point operations inside the linux kernel.
At best, you can use fixed-point arithmetic.
M
next prev parent reply other threads:[~2010-03-29 10:59 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-23 12:57 Query about Float Point Operation 胡杨树
2010-03-23 13:34 ` Måns Rullgård
2010-03-29 5:22 ` Rajanikanth H.V
2010-03-29 8:11 ` Russell King - ARM Linux
2010-03-29 8:19 ` 答复: " rocky
2010-03-29 10:59 ` Martin Guy [this message]
-- strict thread matches above, loose matches on Subject: below --
2010-03-23 13:41 胡杨树
2010-03-28 21:47 ` Jamie Lokier
2010-03-28 23:34 ` Nicolas Pitre
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