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Re: g77 performance on ALPHA
- To: torvalds@transmeta.com, submit-linux-egcs@transmeta.com
- Subject: Re: g77 performance on ALPHA
- From: N8TM@aol.com
- Date: Tue, 31 Aug 1999 08:33:05 EDT
- CC: gcc@gcc.gnu.org
In a message dated 8/30/99 11:55:55 PM EST, torvalds@transmeta.com writes:
> do the proper
> iteration unrolling, testing the loop count just once for "4 or more
> iterations" and then the actual unrolled body would not have any control
> dependencies.
>
> For some reason I thought gcc already did that, but it obviously
> doesn't
That's the difference between "unroll-loops" (if the compiler is willing) and
"unroll-all-loops."