mirror of
https://github.com/golang/go
synced 2024-11-18 07:04:52 -07:00
1abd8d8fd0
1. make the program go buildable 2. update os.EINVAL and runtime.Cgocalls() 3. wrap mpz_div_2exp() and mpz_mul_2exp to support both pre-5.0 and post-5.0 gmp (we really have no reason to restrict ourselves to gmp 5.0+) R=golang-dev, remyoudompheng, iant CC=golang-dev https://golang.org/cl/5847061
107 lines
2.9 KiB
Go
107 lines
2.9 KiB
Go
// +build ignore
|
|
|
|
/*
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions are met:
|
|
|
|
* Redistributions of source code must retain the above copyright
|
|
notice, this list of conditions and the following disclaimer.
|
|
|
|
* Redistributions in binary form must reproduce the above copyright
|
|
notice, this list of conditions and the following disclaimer in the
|
|
documentation and/or other materials provided with the distribution.
|
|
|
|
* Neither the name of "The Computer Language Benchmarks Game" nor the
|
|
name of "The Computer Language Shootout Benchmarks" nor the names of
|
|
its contributors may be used to endorse or promote products derived
|
|
from this software without specific prior written permission.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
|
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
/* The Computer Language Benchmarks Game
|
|
* http://shootout.alioth.debian.org/
|
|
*
|
|
* contributed by The Go Authors.
|
|
* based on pidigits.c (by Paolo Bonzini & Sean Bartlett,
|
|
* modified by Michael Mellor)
|
|
*/
|
|
|
|
package main
|
|
|
|
import (
|
|
big "."
|
|
"fmt"
|
|
"runtime"
|
|
)
|
|
|
|
var (
|
|
tmp1 = big.NewInt(0)
|
|
tmp2 = big.NewInt(0)
|
|
numer = big.NewInt(1)
|
|
accum = big.NewInt(0)
|
|
denom = big.NewInt(1)
|
|
ten = big.NewInt(10)
|
|
)
|
|
|
|
func extractDigit() int64 {
|
|
if big.CmpInt(numer, accum) > 0 {
|
|
return -1
|
|
}
|
|
tmp1.Lsh(numer, 1).Add(tmp1, numer).Add(tmp1, accum)
|
|
big.DivModInt(tmp1, tmp2, tmp1, denom)
|
|
tmp2.Add(tmp2, numer)
|
|
if big.CmpInt(tmp2, denom) >= 0 {
|
|
return -1
|
|
}
|
|
return tmp1.Int64()
|
|
}
|
|
|
|
func nextTerm(k int64) {
|
|
y2 := k*2 + 1
|
|
accum.Add(accum, tmp1.Lsh(numer, 1))
|
|
accum.Mul(accum, tmp1.SetInt64(y2))
|
|
numer.Mul(numer, tmp1.SetInt64(k))
|
|
denom.Mul(denom, tmp1.SetInt64(y2))
|
|
}
|
|
|
|
func eliminateDigit(d int64) {
|
|
accum.Sub(accum, tmp1.Mul(denom, tmp1.SetInt64(d)))
|
|
accum.Mul(accum, ten)
|
|
numer.Mul(numer, ten)
|
|
}
|
|
|
|
func main() {
|
|
i := 0
|
|
k := int64(0)
|
|
for {
|
|
d := int64(-1)
|
|
for d < 0 {
|
|
k++
|
|
nextTerm(k)
|
|
d = extractDigit()
|
|
}
|
|
eliminateDigit(d)
|
|
fmt.Printf("%c", d+'0')
|
|
|
|
if i++; i%50 == 0 {
|
|
fmt.Printf("\n")
|
|
if i >= 1000 {
|
|
break
|
|
}
|
|
}
|
|
}
|
|
|
|
fmt.Printf("\n%d calls; bit sizes: %d %d %d\n", runtime.NumCgoCall(), numer.Len(), accum.Len(), denom.Len())
|
|
}
|