------- Comment #47 from hubicka at ucw dot cz 2006-08-08 06:28 -------
Subject: Re: [4.0/4.1 Regression] gcc 4 produces worse x87 code on all
platforms than gcc 3
> In x86/x86-64 world one can be almost sure that the load+execute instruction
> pair will execute (marginaly to noticeably) faster than move+load-and-execute
> instruction pair as the more complex instructions are harder for on-chip
> scheduling (they retire later).
^^^ retirement filling up the scheduler
easilly.
> Perhaps we can move such a transformation somewhere more generically perhaps
> to
> post-reload copyprop?
>
> Honza
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27827
