PING: PATCH [mainline] speed up comparing enums declared in multiple translation units

[Fariborz Jahanian]

Now that Dale's IMA patch has been approved, this patch is needed for 
SPEC testing with IMA.
It is a localized patch and will have no impact anywhere else.

- fariborz (fjahanian@apple.com)

Begin forwarded message:

> From: Fariborz Jahanian <fjahanian@apple.com>
> Date: March 12, 2004 10:21:39 AM PST
> To: gcc-patches@gcc.gnu.org
> Cc: Fariborz Jahanian <fjahanian@apple.com>
> Subject: PATCH [mainline] speed up comparing enums declared in 
> multiple translation units
>
>
> Made changes suggested by rth and A. Pinski. Revised is attached.
>
> OK for mainline?
>
> - fariborz jahanian (fjahanian@apple.com)
>
>
> This is a performance bug fix which prevents mesa (SPEC program) to 
> compile with IMA in a
> reasonable amount of time. Performance hit is comparing two enumerated 
> types declared in
> different translation unit. Fix is in routine 
> tagged_types_tu_compatible_p and uses
> the infrastructure already there to prevent recursion when comparing 
> composite types.
> Essentially it remembers previous comparison results of the two enum 
> types and uses the
> saved result. bootstrapped, dejagnu tested on ppc-darwin. Furthermore, 
> tested against
> SPEC benchmark with IMA. mesa now takes minutes to compile, instead of 
> days (on my
> particular G5 machine anyway).
>
>
> ChangeLog:
>
> 2004-03-09  Fariborz Jahanian <fjahanian@apple.com>
>         * c-typeck.c (tagged_types_tu_compatible_p): speed up type
>         comparison of enums declared in separate tus.
>
>
> 	
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