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math/big: clarified doc string for SetMantExp

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Fixes #47879.

Change-Id: I35efb5fc65c4f1eb1b45918f95bbe1ff4039950e
Reviewed-on: https://go-review.googlesource.com/c/go/+/344249
Trust: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
This commit is contained in:
Robert Griesemer 2021-08-22 12:11:02 -07:00
parent 6416bde023
commit 19585826fa
1 changed files with 3 additions and 1 deletions
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4
src/math/big/float.go
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@ -304,7 +304,9 @@ func (z *Float) setExpAndRound(exp int64, sbit uint) {
// SetMantExp sets z to mant × 2**exp and returns z. // SetMantExp sets z to mant × 2**exp and returns z.
// The result z has the same precision and rounding mode // The result z has the same precision and rounding mode
// as mant. SetMantExp is an inverse of MantExp but does // as mant. SetMantExp is an inverse of MantExp but does
// not require 0.5 <= |mant| < 1.0. Specifically: // not require 0.5 <= |mant| < 1.0. Specifically, for a
// given x of type *Float, SetMantExp relates to MantExp
// as follows:
// //
// mant := new(Float) // mant := new(Float)
// new(Float).SetMantExp(mant, x.MantExp(mant)).Cmp(x) == 0 // new(Float).SetMantExp(mant, x.MantExp(mant)).Cmp(x) == 0