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7b8c134b54
Reduce MOV and MOVPRFX by improving special-case handling. Use inline helper to duplicate the entire computation between the special- and non-special case branches, removing the contention for z0 between x and the return value. Also rearrange some MLAs and MLSs - by making the multiplicand the destination we can avoid a MOVPRFX in several cases. Also change which constants go in the vector used for lanewise ops - the last lane is no longer wasted. Spotted that shift was incorrect in exp2f and exp10f, w.r.t. to the comment that explains it. Fixed - worst-case ULP for exp2f moves around but it doesn't change significantly for either routine. Worst-case error for coshf increases due to passing x to exp rather than abs(x) - updated the comment, but does not require regen-ulps. Reviewed-by: Wilco Dijkstra <Wilco.Dijkstra@arm.com> |
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