1 // run 2 3 // Copyright 2011 The Go Authors. All rights reserved. 4 // Use of this source code is governed by a BSD-style 5 // license that can be found in the LICENSE file. 6 7 package main 8 9 // 5g bug used to set up the 0 for -f() before calling f, 10 // and the call to f smashed the register. 11 12 func f(n int) int { 13 s := 0 14 for i := 0; i < n; i++ { 15 s += i>>1 16 } 17 return s 18 } 19 20 func main() { 21 x := -f(100) 22 if x != -2450 { 23 println(x) 24 panic("broken") 25 } 26 } 27
