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Re: [PATCH] PR middle-end/18293: Fast-path expand_mult for 2^N
- From: Zack Weinberg <zack at codesourcery dot com>
- To: Ian Lance Taylor <ian at wasabisystems dot com>
- Cc: Mike Stump <mrs at apple dot com>, Roger Sayle <roger at eyesopen dot com>, gcc-patches at gcc dot gnu dot org
- Date: Wed, 08 Dec 2004 10:48:17 -0800
- Subject: Re: [PATCH] PR middle-end/18293: Fast-path expand_mult for 2^N
- References: <708EAF75-4943-11D9-B410-003065BDF310@apple.com><m3zn0obpy2.fsf@gossamer.airs.com>
Ian Lance Taylor <ian@wasabisystems.com> writes:
> Mike Stump <mrs@apple.com> writes:
>
>> I was thinking about doing something radical like saving every -E
>> during compilation, and doing a move if changed on them all to produce
>> the .o files in much the same spirit as one of the existing stamp
>> idioms.
>>
>> I'd expect the benefit would be better compile times for all port
>> maintainers, and the improvement would be large.
>
> An interesting idea, and dead easy to implement 80% of it. Try
> replacing the .c.o rule in gcc/Makefile.in with this. This is
> untested, and I think it should only be enabled with some configure
> switch.
... isn't this just ccache?
zw