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| author | Brian Kessler <brian.m.kessler@gmail.com> | 2018-12-13 09:19:11 -0700 |
|---|---|---|
| committer | Robert Griesemer <gri@golang.org> | 2018-12-13 20:35:45 +0000 |
| commit | 02ad841dd82bd644b12efa168ad9fc4c623d6b37 (patch) | |
| tree | 0fea9468edf250bf37b706e420b97c1775e43e48 /src/math | |
| parent | d177e10d2268d92e1babbbdf98fa992cb55bcff4 (diff) | |
| download | go-02ad841dd82bd644b12efa168ad9fc4c623d6b37.tar.xz | |
math: correct mPi4 comment
The previous comment mis-stated the number of bits in mPi4.
The correct value is 19*64 + 1 == 1217 bits.
Change-Id: Ife971ff6936ce2d5b81ce663ce48044749d592a0
Reviewed-on: https://go-review.googlesource.com/c/154017
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Diffstat (limited to 'src/math')
| -rw-r--r-- | src/math/trig_reduce.go | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/src/math/trig_reduce.go b/src/math/trig_reduce.go index 7bc72e986d..6f8eaba9b9 100644 --- a/src/math/trig_reduce.go +++ b/src/math/trig_reduce.go @@ -68,8 +68,8 @@ func trigReduce(x float64) (j uint64, z float64) { // mPi4 is the binary digits of 4/pi as a uint64 array, // that is, 4/pi = Sum mPi4[i]*2^(-64*i) -// 19 64-bit digits gives 1153 bits of precision to handle -// the largest possible float64 exponent. +// 19 64-bit digits and the leading one bit give 1217 bits +// of precision to handle the largest possible float64 exponent. var mPi4 = [...]uint64{ 0x0000000000000001, 0x45f306dc9c882a53, |