Path: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: David Brown <david.brown@hesbynett.no>
Newsgroups: comp.lang.c
Subject: Re: "undefined behavior"?
Date: Fri, 14 Jun 2024 19:13:42 +0200
Organization: A noiseless patient Spider
Lines: 13
Message-ID: <v4hto6$2ve93$2@dont-email.me>
References: <666a095a$0$952$882e4bbb@reader.netnews.com>
 <v4d4h5$1rc9e$1@dont-email.me> <666a2146$0$950$882e4bbb@reader.netnews.com>
 <v4erec$29e2g$1@dont-email.me> <87cyok5rsd.fsf@nosuchdomain.example.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit
Injection-Date: Fri, 14 Jun 2024 19:13:42 +0200 (CEST)
Injection-Info: dont-email.me; posting-host="5114d15351a76dd9e40c177759448f25";
	logging-data="3127587"; mail-complaints-to="abuse@eternal-september.org";	posting-account="U2FsdGVkX18dX14m+EDLxFZ3mYT1ez8ga5Q+NkwG7aw="
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101
 Thunderbird/102.11.0
Cancel-Lock: sha1:0Q7k7yESRXlSC50CmRGCk4dieFg=
In-Reply-To: <87cyok5rsd.fsf@nosuchdomain.example.com>
Content-Language: en-GB
Bytes: 1631

On 14/06/2024 01:47, Keith Thompson wrote:
> David Brown <david.brown@hesbynett.no> writes:
> [...]
>>        Certainly "-O3" is rarely worth it unless you are also using a
>> "-march=" flag (such as "-fmarch=native") to tune for a particular
>> processor and enable stuff like vectorisation.  Getting the fastest
>> code is more of an art than a science!
> 
> Typo: it's "-march=native".
> 

Thanks.