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Re: changing "configure" to default to "gcc -g -O2 -fwrapv ..."
From: |
Paul Eggert |
Subject: |
Re: changing "configure" to default to "gcc -g -O2 -fwrapv ..." |
Date: |
Sun, 31 Dec 2006 17:21:26 -0800 |
User-agent: |
Gnus/5.1008 (Gnus v5.10.8) Emacs/21.4 (gnu/linux) |
"Daniel Berlin" <address@hidden> writes:
>> http://www.suse.de/~gcctest/SPEC/CFP/sb-vangelis-head-64/recent.html
>> and
>> http://www.suse.de/~gcctest/SPEC/CINT/sb-vangelis-head-64/recent.html
>>
> Note the distinct drop in performance across almost all the benchmarks
> on Dec 30, including popular programs like bzip2 and gzip.
That benchmark isn't that relevant, as it's using -O3, as is typical
for SPEC benchmarks.
This discussion is talking about -O2, not -O3. The proposed change
(i.e., having -O2 imply -fwrapv) would not affect -O3 benchmark
scores.
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ...", (continued)
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ...", Paul Eggert, 2006/12/31
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ...", Steven Bosscher, 2006/12/31
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ...", Paul Eggert, 2006/12/31
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ...", Richard Kenner, 2006/12/31
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ...", Robert Dewar, 2006/12/31
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ...", Richard Kenner, 2006/12/31
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ...", Robert Dewar, 2006/12/31
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ...", Daniel Berlin, 2006/12/31
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ...", Richard Guenther, 2006/12/31
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ...", Daniel Berlin, 2006/12/31
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ...",
Paul Eggert <=
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ...", Ian Lance Taylor, 2006/12/31
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ...", Seongbae Park, 2006/12/31
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ...", Paul Eggert, 2006/12/31
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ...", Robert Dewar, 2006/12/31
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ...", Richard Guenther, 2006/12/31
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ...", Richard Kenner, 2006/12/31
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ...", Richard Guenther, 2006/12/31
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ...", Richard Kenner, 2006/12/31
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ...", Ian Lance Taylor, 2006/12/31
- Re: changing "configure" to default to "gcc -g -O2 -fwrapv ...", Richard Kenner, 2006/12/31