tree ed439185b0dbaf74dccc6e834ef2697c8fb2f15a
parent 478b594d5117729694deecbcb205bb15b6085f7a
author Robert Griesemer <gri@golang.org> 1458324995 -0700
committer Robert Griesemer <gri@golang.org> 1458591846 +0000

math/big: fix rounding to smallest denormal for Float.Float32/64

Converting a big.Float value x to a float32/64 value did not correctly
round x up to the smallest denormal float32/64 if x was smaller than the
smallest denormal float32/64, but larger than 0.5 of a smallest denormal
float32/64.

Handle this case explicitly and simplify some code in the turn.

For #14651.

Change-Id: I025e24bf8f0e671581a7de0abf7c1cd7e6403a6c
Reviewed-on: https://go-review.googlesource.com/20816
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Alan Donovan <adonovan@google.com>