math/big: fix a formula used as documentation

The function documentation was wrong, it was using a wrong parameter. This change
replaces it with the right parameter.

The wrong formula was: q = (u1<<_W + u0 - r)/y
The function has got a parameter "v" (of type Word), not a parameter "y".
So, the right formula is: q = (u1<<_W + u0 - r)/v

Fixes #28444

Change-Id: I82e57ba014735a9fdb6262874ddf498754d30d33
Reviewed-on: https://go-review.googlesource.com/c/145280
Reviewed-by: Robert Griesemer <gri@golang.org>

diff --git a/src/math/big/arith.go b/src/math/big/arith.go
index ad352403a7c5e7223ff1f6fb081d877542da6f95..f9db9118eb254e18a19e30a87ed0c55eca03e056 100644 (file)
--- a/src/math/big/arith.go
+++ b/src/math/big/arith.go
@@ -82,7 +82,7 @@ func nlz(x Word) uint {
        return uint(bits.LeadingZeros(uint(x)))
 }
 
-// q = (u1<<_W + u0 - r)/y
+// q = (u1<<_W + u0 - r)/v
 // Adapted from Warren, Hacker's Delight, p. 152.
 func divWW_g(u1, u0, v Word) (q, r Word) {
        if u1 >= v {