Arch-independent double-word clz expansion and a few other tweaks for bitscanning

[Rask Ingemann Lambertsen]

On Sat, Aug 11, 2007 at 07:05:25AM -0400, Hans-Peter Nilsson wrote:

> If combine "wants it" that way (proof would be helpful),

   -fdump-rtl-combine-details

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Rask Ingemann Lambertsen