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Revert "x/tools/container/intsets: remove unused function"

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This reverts commit 79902b439b3ef4c163ff5e96ac1f282f31c8a131.

Reason for revert: build broken on some platforms.

Change-Id: I5ceddc305580ff97f47ae27da831f99e96dab424
Reviewed-on: https://go-review.googlesource.com/37539
Reviewed-by: David R. Jenni <david.r.jenni@gmail.com>
Reviewed-by: Alan Donovan <adonovan@google.com>
This commit is contained in:
Alan Donovan 2017-03-01 14:50:34 +00:00
parent f9348ea9b1
commit 81cc31eaa9
1 changed files with 10 additions and 0 deletions
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10
container/intsets/util.go
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@ -4,6 +4,16 @@
package intsets
// From Hacker's Delight, fig 5.2.
func popcountHD(x uint32) int {
x -= (x >> 1) & 0x55555555
x = (x & 0x33333333) + ((x >> 2) & 0x33333333)
x = (x + (x >> 4)) & 0x0f0f0f0f
x = x + (x >> 8)
x = x + (x >> 16)
return int(x & 0x0000003f)
}
var a [1 << 8]byte
func init() {