| // compile |
| |
| // Copyright 2016 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| package bug |
| |
| func example(n int) (rc int) { |
| var cc, ll, pp, rr [27]int |
| for q0 := 0; q0 < n-2; q0++ { |
| for q1 := q0 + 2; q1 < n; q1++ { |
| var c, d, l, p, r int |
| b0 := 1 << uint(q0) |
| b1 := 1 << uint(q1) |
| l = ((b0 << 1) | b1) << 1 |
| c = b0 | b1 | (-1 << uint(n)) |
| r = ((b0 >> 1) | b1) >> 1 |
| E: |
| if c != -1 { |
| p = ^(l | c | r) |
| } else { |
| rc++ |
| goto R |
| } |
| L: |
| if p != 0 { |
| lsb := p & -p |
| p &^= lsb |
| ll[d], cc[d], rr[d], pp[d] = l, c, r, p |
| l, c, r = (l|lsb)<<1, c|lsb, (r|lsb)>>1 |
| d++ |
| goto E |
| } |
| R: |
| d-- |
| if d >= 0 { |
| l, c, r, p = ll[d], cc[d], rr[d], pp[d] |
| goto L |
| } |
| } |
| } |
| rc <<= 1 |
| return |
| } |
