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RE: Processor-specific code

From: Paul Koning <pkoning at equallogic dot com>
To: dave dot korn at artimi dot com
Cc: fortran at gcc dot gnu dot org, gcc at gcc dot gnu dot org
Date: Fri, 15 Apr 2005 12:55:59 -0400
Subject: RE: Processor-specific code
References: <1113583320.20842.5.camel@pc960.cambridge.arm.com><SERRANOpM2yqOX9kOS60000018e@SERRANO.CAM.ARTIMI.COM>

>>>>> "Dave" == Dave Korn <dave.korn@artimi.com> writes:

 Dave> Doesn't the C language spec require the mode to be switchable
 Dave> at runtime?

 Dave> In any case, the ARM or Alpha isn't prevented from working in
 Dave> such a fashion just because the rounding mode is encoded in the
 Dave> instruction; it just means that fp primitives have to be
 Dave> compiled as intrinsics that test whatever flag controls the
 Dave> rounding mode and then branch to an fp insn of the appropriate
 Dave> form.

That only works if the notion of switchable rounding mode exists.  It
doesn't on VAX, PDP-11, PDP-10, ...

	paul

Follow-Ups:
- RE: Processor-specific code
  - From: Dave Korn
- Re: Processor-specific code
  - From: Mike Stump

References:
- Re: Processor-specific code
  - From: Richard Earnshaw
- RE: Processor-specific code
  - From: Dave Korn

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