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Re: CSE fold_rtx subreg patch
- To: John Wehle <john at feith dot com>
- Subject: Re: CSE fold_rtx subreg patch
- From: Jeffrey A Law <law at cygnus dot com>
- Date: Fri, 18 Sep 1998 23:52:35 -0600
- cc: egcs-patches at cygnus dot com
- Reply-To: law at cygnus dot com
In message <199809190509.BAA01168@jwlab.FEITH.COM>you write:
> The assembly resulting from compiling gcc for a x86 with the original
> fold_rtx patch (which propagates the SUBREGs) installed is only slightly
> different from that resulting from using an unpatched version of gcc.
> In a couple of places it's marginally better, in a couple of other
> places it's marginally worst.
>
> The assembly resulting from compiling gcc with the second patch (which
> doesn't propagate the SUBREGs) installed is quite different in terms of
> register names. Once you get pass the register name differences it seems
> to be the same story as above.
OK. Thanks.
> Having played with this a little more I'm incline to believe that it's
> a non-issue. All things considered I would shelve both patches until
> someone comes up with some real code which one of the patches helps.
OK. Let's table it for now. Nothing says we can't look at it again
later.
jeff