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Re: Inner-loop optimization regression from 3.3 to 3.4
- From: Falk Hueffner <falk dot hueffner at student dot uni-tuebingen dot de>
- To: Jan Hubicka <jh at suse dot cz>
- Cc: Richard Henderson <rth at redhat dot com>,Zack Weinberg <zack at codesourcery dot com>, gcc at gcc dot gnu dot org,Jan Hubicka <hubicka at ucw dot cz>
- Date: 01 Nov 2003 17:27:09 +0100
- Subject: Re: Inner-loop optimization regression from 3.3 to 3.4
- References: <87vfqt66ge.fsf@codesourcery.com><20031013130323.GY14005@kam.mff.cuni.cz><87fzhvdxf3.fsf@codesourcery.com><20031017141002.GF6212@kam.mff.cuni.cz><20031018201817.GB29612@redhat.com><20031101113548.GC14974@kam.mff.cuni.cz>
Jan Hubicka <jh@suse.cz> writes:
> + /* Convert (a >= 0) into (~a < 0). */
While we're at it, this is also a pessimization on Alpha, and probably
elsewhere where one has direct comparisons to registers and a zero
register.
--
Falk