Hi,

This patch has a fix for prs 37807 (exponential time with MMX builtins)
and 37809 (wrong code with MMX builtins).

Could an expert check that I'm not inadvertantly disabling important
optimisations for vector types?  I believe the code in question was
only ever intended to be used for scalar types, but it is possible that
I've missed something.

2008-10-19  Ralph Loader  <suckfish@ihug.co.nz>

	PR middle-end/37807, middle-end/37809
	* combine.c (force_to_mode): Do not process vector types.

	* rtlanal.c (nonzero_bits1): Do not process vector types.
	(num_sign_bit_copies1): Likewise.

Cheers,
Ralph.