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x = k + y for some integer k and |y| < 1/2 exp2(x) = exp2(k + y) = exp2(k) * exp2(y) which can be written as 2**k * exp2(y) The original had x = 2**k + y, which is has an extra 2** in it which isn't correct. Confirmed by forumula 2 in Gal and Bachelis referenced in the comments for the source of this method https://dl.acm.org/doi/pdf/10.1145/103147.103151 The actual code is correct. Reviewed by: imp (who added s_exp2.c and wrote the commit message) Pull Request: https://github.com/freebsd/freebsd-src/pull/1127 |
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