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

From: kenner at vlsi1 dot ultra dot nyu dot edu (Richard Kenner)
To: dewar at adacore dot com
Cc: autoconf-patches at gnu dot org, bernds_cb1 at t-online dot de, bug-gnulib at gnu dot org, ebb9 at byu dot net, eggert at cs dot ucla dot edu, gcc at gcc dot gnu dot org, gdr at integrable-solutions dot net, pinskia at physics dot uc dot edu, richard dot guenther at gmail dot com
Date: Sun, 31 Dec 2006 09:08:21 EST
Subject: Re: changing "configure" to default to "gcc -g -O2 -fwrapv ..."
References: <200612310042.kBV0g5pt027400@localhost.localdomain> <45970D3D.1090700@adacore.com> <20061231120933.GS32297@ay.vinc17.org> <4597B5F0.5050504@adacore.com>

> In fact the wrap around range test is a standard idiom for "hand
> optimization" of range tests.

It's also one that GCC uses internally, but you do it in *unsigned* to
avoid the undefined overflow.

Follow-Ups:
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ..."
  - From: Vincent Lefevre

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: Robert Dewar
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ..."
  - From: Vincent Lefevre
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ..."
  - From: Robert Dewar

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