Performance comparison, ULE vs 4BSD and AMD64 vs i386

David O'Brien obrien at
Wed Feb 25 10:54:59 PST 2004

On Wed, Feb 25, 2004 at 10:45:14AM -0800, Brooks Davis wrote:
> The other big thing with gcc for amd64 is that we're still more in
> the "run correctly" then the the "run fast" stage in terms of the
> development cycle.  With a compiler, "produces fast/correct code" beats
> "run fast" any day.  The code generator has been widly used for less
> then a year.  Compared to the life history of the i386 code generator
> that's pretty short and the user base is still small relative to the
> installed base of i386 machines.  Even if generating amd64 code is
> easier then generating i386 code, it's probably still a bit early to
> expect the compiler to do it quickly.

Not true -- AMD has spent more effort making GCC 3.3 (well the 3.3
hammer_branch) generate faster code than anyone has for any other
architecture to date.

-- David  (obrien at

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