I'm newbie in Golan, this should be an easy question for experienced golang devs. I try to do the same test from Spotify to see how fast we can go in Golang :)
3条回答 默认 最新
- dpizd08264 2013-08-17 08:48关注
The usual bit-twiddling C solutions translate immediately to Go.
package main import "fmt" func BitReverse32(x uint32) uint32 { x = (x&0x55555555)<<1 | (x&0xAAAAAAAA)>>1 x = (x&0x33333333)<<2 | (x&0xCCCCCCCC)>>2 x = (x&0x0F0F0F0F)<<4 | (x&0xF0F0F0F0)>>4 x = (x&0x00FF00FF)<<8 | (x&0xFF00FF00)>>8 return (x&0x0000FFFF)<<16 | (x&0xFFFF0000)>>16 } func main() { cases := []uint32{0x1, 0x100, 0x1000, 0x1000000, 0x10000000, 0x80000000, 0x89abcdef} for _, c := range cases { fmt.Printf("%08x -> %08x ", c, BitReverse32(c)) } }
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