patch: SIMD loop fusion

[Stefan Seefeld]

The attached patch adds support for SIMD (i.e. vectorized) loop fusion
to our expression block evaluation harness. It is enabled for homogenous
scalar expressions (i.e. all leaf blocks have float or double value_type)
on platforms supporting SSE(2) instructions (such as 'gcc -msse2').

Regards,
		Stefan

-- 
Stefan Seefeld
CodeSourcery
stefan at codesourcery.com
(650) 331-3385 x718
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