From: Peter Bergner <bergner@vnet.ibm.com>
To: Wolfgang Denk <wd@denx.de>
Cc: linuxppc-dev@ozlabs.org
Subject: Re: Mixing hard and soft floating point?
Date: Sun, 18 Oct 2009 19:57:24 -0500 [thread overview]
Message-ID: <1255913844.4930.4.camel@otta> (raw)
In-Reply-To: <20091017193454.7978FF15432@gemini.denx.de>
On Sat, 2009-10-17 at 21:34 +0200, Wolfgang Denk wrote:
> Dear Joakim Tjernlund,
> > OK, but then you don't mix some libs/apps with soft and other
> > apps/libs with hard FP?
>
> No, we never tried that. Sounds scary to me.
And dangerous. Hard-float and soft-float are ABI incompatible, so you
cannot mix and match obj files and libs compiled with those two options.
They all have to be hard-float or they all have to be soft-float.
Think about a function compiled with hard-float calling a soft-float
libm routine. The hard-float routine will pass its args in via FP
regs and the soft-float lib routine will be looking for them in the
integer registers.
Peter
prev parent reply other threads:[~2009-10-19 0:57 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-17 12:14 Mixing hard and soft floating point? Joakim Tjernlund
2009-10-17 18:12 ` Wolfgang Denk
2009-10-17 18:24 ` Joakim Tjernlund
2009-10-17 19:34 ` Wolfgang Denk
2009-10-18 11:28 ` Joakim Tjernlund
2009-10-18 13:10 ` Wolfgang Denk
2009-10-19 0:57 ` Peter Bergner [this message]
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