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test/fixedbugs/issue4448.go
37 строк
718 B
Emmanuel Odeke
all: make copyright headers consistent with one space after period
02 май 2016, 16:43
02 май 2016, 16:43
53fd522
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// run // Copyright 2012 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. // Issue 4448: 64-bit indices that are statically known // to be bounded make 5g and 8g generate a dangling branch. package main const b26 uint64 = 0x022fdd63cc95386d var bitPos [64]int func init() { for p := uint(0); p < 64; p++ { bitPos[b26<<p>>58] = int(p) } } func MinPos(w uint64) int { if w == 0 { panic("bit: MinPos(0) undefined") } return bitPos[((w&-w)*b26)>>58] } func main() { const one = uint64(1) for i := 0; i < 64; i++ { if MinPos(1<<uint(i)) != i { println("i =", i) panic("MinPos(1<<uint(i)) != i") } } }