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RE: __builtin_expect for indirect function calls

From: "Dave Korn" <dave dot korn at artimi dot com>
To: "'Mark Mendell'" <mendell at ca dot ibm dot com>, "'Mark Mitchell'" <mark at codesourcery dot com>
Cc: <Andrew_Pinski at playstation dot sony dot com>, "'gcc'" <gcc at gcc dot gnu dot org>, "'Hans-Peter Nilsson'" <hp at bitrange dot com>, "'Richard Guenther'" <richard dot guenther at gmail dot com>, <Russell_Olsen at playstation dot sony dot com>, <trevor_smigiel at playstation dot sony dot com>
Date: Tue, 8 Jan 2008 15:35:53 -0000
Subject: RE: __builtin_expect for indirect function calls
References: <20071218000552.GV3656@playstation.sony.com> <20071221220630.Y67443@dair.pair.com> <4772A350.6030907@codesourcery.com> <20080103233308.GD5853@playstation.sony.com> <477F190B.2000807@codesourcery.com> <84fc9c000801050240l6918b59dpd519dea81ddd3ad@mail.gmail.com> <47812F74.3020905@codesourcery.com> <OFAFCA915C.26EC5659-ON852573C9.00745C20-852573C9.0074BBD2@ca.ibm.com>

On 07 January 2008 21:15, Mark Mendell wrote:

> A question was raised:  Are side effects in the second parameter guaranteed
> to be executed?  Is it valid for a compiler to ignore any side effects?

  That perked up my curiosity:

"  The value of C must be a compile-time constant.  "

  Can a compile-time constant have run-time side-effects?  I couldn't think up
an example off the top of my head...

    cheers,
      DaveK
-- 
Can't think of a witty .sigline today....

Follow-Ups:
- RE: __builtin_expect for indirect function calls
  - From: Dave Korn

References:
- Re: __builtin_expect for indirect function calls
  - From: trevor_smigiel
- Re: __builtin_expect for indirect function calls
  - From: Mark Mitchell
- Re: __builtin_expect for indirect function calls
  - From: Richard Guenther
- Re: __builtin_expect for indirect function calls
  - From: Mark Mitchell
- Re: __builtin_expect for indirect function calls
  - From: Mark Mendell

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