markj 3e02c9db48 Reduce diff between msun/src/e_pow.c and msun/src/e_powf.c.
Remove unnecessary casts, use integer literal constants instead of
floating point constants where possible, and introduce three const
static variables to hold 0.5, 0.25, and 1/3.

PR:		229420
Submitted by:	Steve Kargl <sgk@troutmask.apl.washington.edu>
MFC after:	1 week
2018-07-08 16:33:58 +00:00
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