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Date: Fri, 14 Jan 2005 05:15:36 -0800
From: Kris Kennaway <kris@obsecurity.org>
To: David Schultz <das@FreeBSD.org>
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Subject: Re: cvs commit: src/lib/msun/alpha fenv.h src/lib/msun/amd64 fenv.h
	src/lib/msun/arm fenv.h src/lib/msun/i387 fenv.h src/lib/msun/ia64
	fenv.h src/lib/msun/powerpc fenv.h src/lib/msun/sparc64 fenv.h
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On Fri, Jan 14, 2005 at 07:09:23AM +0000, David Schultz wrote:
> das         2005-01-14 07:09:23 UTC
>=20
>   FreeBSD src repository
>=20
>   Modified files:
>     lib/msun/alpha       fenv.h=20
>     lib/msun/amd64       fenv.h=20
>     lib/msun/arm         fenv.h=20
>     lib/msun/i387        fenv.h=20
>     lib/msun/ia64        fenv.h=20
>     lib/msun/powerpc     fenv.h=20
>     lib/msun/sparc64     fenv.h=20
>   Log:
>   Mark all inline asms that read the floating-point control or status
>   registers as volatile.  Instructions that *wrote* to FP state were
>   already marked volatile, but apparently gcc has license to move
>   non-volatile asms past volatile asms.  This broke amd64's feupdateenv
>   at -O2 due to a WAR conflict between fnstsw and fldenv there.

Do you think this is likely to the cause of the build failures
reported with a number of ports when world is compiled with -O2
(i.e. does the feupdateenv failure cascade to other commonly-used
parts of the code)?

Kris


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