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sort: avoid overflow in pivot calculation.

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thanks to snilsson@nada.kth.se for the original CL.

R=gri
CC=golang-dev, snilsson
https://golang.org/cl/3280044
This commit is contained in:
Rob Pike 2010-11-30 10:37:57 -08:00
parent 0dc24603eb
commit b389646243
1 changed files with 1 additions and 1 deletions
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2
src/pkg/sort/sort.go
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@ -63,7 +63,7 @@ func swapRange(data Interface, a, b, n int) {
}
func doPivot(data Interface, lo, hi int) (midlo, midhi int) {
m := (lo + hi) / 2
m := lo + (hi-lo)/2 // Written like this to avoid integer overflow.
if hi-lo > 40 {
// Tukey's ``Ninther,'' median of three medians of three.
s := (hi - lo) / 8