Performance comparison, ULE vs 4BSD and AMD64 vs i386

[David O'Brien]

On Wed, Feb 25, 2004 at 01:50:35PM -0500, Kenneth Culver wrote:
> Ok well maybe not with amd64, but I thought that when you add registers
                                      ^^^^^^^

This is the key word here -- "thought".  No one has done any real analsys
and thus we can't say jack.  While at first thought compiling for a large
number of GPR's could be more time consuming; I think there are other
phases of code generation where the process is slower due to lack of a
large number of GPR's.

> Like on PowerPC or Alpha or whatever there are a LOT more GPR's than
> there are on even Athlon64... I guess only having 2x the GPR's doesn't
> make a whole lot of difference...

PowerPC and Alpha are also RISC and have other scheduling issues for the
code generator to handle.

-- 
-- David  (obrien at FreeBSD.org)