go issue43480 源码
golang issue43480 代码
文件路径：/test/fixedbugs/issue43480.go
// run
// Copyright 2020 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 #43480: ICE on large uint64 constants in switch cases.
package main
func isPow10(x uint64) bool {
switch x {
case 1e0, 1e1, 1e2, 1e3, 1e4, 1e5, 1e6, 1e7, 1e8, 1e9,
1e10, 1e11, 1e12, 1e13, 1e14, 1e15, 1e16, 1e17, 1e18, 1e19:
return true
}
return false
}
func main() {
var x uint64 = 1
for {
if !isPow10(x) || isPow10(x-1) || isPow10(x+1) {
panic(x)
}
next := x * 10
if next/10 != x {
break // overflow
}
x = next
}
}
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