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Re: changing "configure" to default to "gcc -g -O2 -fwrapv ..."
From: |
Gerald Pfeifer |
Subject: |
Re: changing "configure" to default to "gcc -g -O2 -fwrapv ..." |
Date: |
Tue, 2 Jan 2007 09:06:51 +0100 (CET) |
On Tue, 2 Jan 2007, Gabriel Dos Reis wrote:
>|> for (i = 1; i < m; ++i)
>|> {
>|> if (i > 0)
>|> bar ();
>|> }
>| Of course, this is an example where either the programmer is doing
>| something very silly or else is expecting overflow and depending on
>| wrap semantics, so it seems to me marginal to remove that "if". My
>| suggestion would be to issue a warning saying that the test will never
>| be false, but leaving it in.
> That make sense to me.
I'm worried about our ability to optimize deeply inlined code and things
like template-heavy C++ code if do skip optimizations like this.
Gerald
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ...", (continued)
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ...", Richard Kenner, 2007/01/01
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ...", Mark Mitchell, 2007/01/01
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ...", Ian Lance Taylor, 2007/01/01
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ...", Richard Kenner, 2007/01/01
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ...", Andrew Pinski, 2007/01/01
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ...", Gabriel Dos Reis, 2007/01/02
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ...",
Gerald Pfeifer <=
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ...", Gabriel Dos Reis, 2007/01/02
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ...", Richard Kenner, 2007/01/02
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ...", Geert Bosch, 2007/01/02
Re: changing "configure" to default to "gcc -g -O2 -fwrapv ...", Diego Novillo, 2007/01/02
Re: changing "configure" to default to "gcc -g -O2 -fwrapv ...", Laurent GUERBY, 2007/01/03
Re: changing "configure" to default to "gcc -g -O2 -fwrapv ...", Thorsten Glaser, 2007/01/16