[PATCH] Reduce cost of Athlon multiplication sequences

[Roger Sayle]

On Thu, 5 Jan 2006, Richard Henderson wrote:
> Even if we don't add the cost check, I wonder if we should
> be checking TARGET_DECOMPOSE_LEA here...

Interestingly, that's the follow-up patch that I mentioned in
my posting.  Currently, TARGET_DECOMPOSE_LEA has absolutely no
effect in the i386 backend, other than to tweak the cost of
ix86_cost->lea in ix86_rtx_costs.  This of course, is fairly
pointless, as the subtargets can now directly control the
ix86_cost->lea themselves.

My follow-up patch was therefore to remove all vestiges of
TARGET_DECOMPOSE_LEA and x86_decompose_lea from the config/i386
directory.  Instead, the one place where it currently used
instead falls back to the "ix86_cost->lea <= ix86_cost->shift_const"
on the following line.

Roger
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