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Re: changing "configure" to default to "gcc -g -O2 -fwrapv ..."

From: Andreas Schwab <schwab at suse dot de>
To: Bernd Schmidt <bernds_cb1 at t-online dot de>
Cc: Eric Blake <ebb9 at byu dot net>, Paul Eggert <eggert at CS dot UCLA dot EDU>, Richard Kenner <kenner at vlsi1 dot ultra dot nyu dot edu>, gcc at gcc dot gnu dot org, autoconf-patches at gnu dot org, bug-gnulib at gnu dot org, pinskia at physics dot uc dot edu
Date: Sun, 31 Dec 2006 11:02:55 +0100
Subject: Re: changing "configure" to default to "gcc -g -O2 -fwrapv ..."
References: <200612300047.kBU0lFwk014817@localhost.localdomain> <87bqlmkui3.fsf@penguin.cs.ucla.edu> <10612300508.AA08474@vlsi1.ultra.nyu.edu> <87psa1izpc.fsf@penguin.cs.ucla.edu> <45963E6D.5070203@t-online.de> <45967953.7060203@byu.net> <45971968.5040400@t-online.de>

Bernd Schmidt <bernds_cb1@t-online.de> writes:

> I must admit I don't know what an integer with padding bits would look
> like.  Can someone check what the C standard has to say about the bit-not
> operator?

All arithmethic operations operate only on the value bits and ignore the
padding bits.

Andreas.

-- 
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
PGP key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

References:
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ..."
  - From: Andrew Pinski
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ..."
  - From: Paul Eggert
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ..."
  - From: Richard Kenner
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ..."
  - From: Paul Eggert
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ..."
  - From: Bernd Schmidt
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ..."
  - From: Eric Blake
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ..."
  - From: Bernd Schmidt

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