const math/bits.m4 3 uses math/bits (current package) bits.go#L108: const m4 = 0x0000ffff0000ffff bits.go#L289: x = x>>16&(m4&m) | x&(m4&m)<<16
The pages are generated with Golds v0.4.9. (GOOS=linux GOARCH=amd64)