tree 80a149cd724906606532751fab4ff870ad750930
parent 65464ec60ba73d113c8bd1632708014fa82dc9c6
author Szabolcs Nagy <szabolcs.nagy@arm.com> 1571062888 +0100
committer Szabolcs Nagy <szabolcs.nagy@arm.com> 1572979131 +0000

Add vector exp2f

Same design as in expf. Worst-case error of __v_exp2f and __v_exp2f_1u
is 1.96 and 0.88 ulp respectively.

It is not clear if round/convert instructions are better or +- Shift.
For expf the latter, for exp2f the former seems more consistently
faster, but both options are kept in the code for now.