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Enhancement of the arithmetic function derive type optimizers to
better handle float zeros, by Raymond Toy and Douglas Crosher: * The arithmetic function derive type optimisers now accept intervals for which -0.0 and 0.0 are recognisably different. This will fix naturally into a proposal by Raymond Toy which is conditional upon :negative-zero-is-not-zero. Without this feature the functions {one,two}-arg-derive-type convert the type intervals appropriately before and after these optimisers so that the user visible type specifiers behave the same. * Update interval-range-info to recognise the difference between -0.0 and 0.0. This in turn helps fix the phase derive type optimizer. * Elfun-derive-type-simple now uses a type specifier to giving the applicable range rather then a function; updates to the various uses of this function. * The sqrt and log derive type optimizers have been re-written and now use elfun-derive-type-simple. * Remove the unused function numeric-real-union-type-p. * Extend the expt trnasform to transform powers of 1/2 to sqrt.
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