Commit 02ad841d authored by Brian Kessler's avatar Brian Kessler Committed by Robert Griesemer

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/154017Reviewed-by: default avatarBrad Fitzpatrick <bradfitz@golang.org>
parent d177e10d
......@@ -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,
......
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