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misc/cgo/gmp: update for Go 1
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
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@ -98,8 +98,20 @@ Go to hang on to a reference to the pointer until C is done with it.
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*/
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package gmp
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// #include <gmp.h>
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// #include <stdlib.h>
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/*
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#cgo LDFLAGS: -lgmp
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#include <gmp.h>
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#include <stdlib.h>
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// gmp 5.0.0+ changed the type of the 3rd argument to mp_bitcnt_t,
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// so, to support older versions, we wrap these two functions.
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void _mpz_mul_2exp(mpz_ptr a, mpz_ptr b, unsigned long n) {
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mpz_mul_2exp(a, b, n);
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}
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void _mpz_div_2exp(mpz_ptr a, mpz_ptr b, unsigned long n) {
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mpz_div_2exp(a, b, n);
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}
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*/
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import "C"
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import (
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@ -182,12 +194,12 @@ func (z *Int) SetInt64(x int64) *Int {
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func (z *Int) SetString(s string, base int) error {
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z.doinit()
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if base < 2 || base > 36 {
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return os.EINVAL
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return os.ErrInvalid
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}
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p := C.CString(s)
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defer C.free(unsafe.Pointer(p))
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if C.mpz_set_str(&z.i[0], p, C.int(base)) < 0 {
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return os.EINVAL
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return os.ErrInvalid
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}
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return nil
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}
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@ -265,7 +277,7 @@ func (z *Int) Mod(x, y *Int) *Int {
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func (z *Int) Lsh(x *Int, s uint) *Int {
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x.doinit()
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z.doinit()
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C.mpz_mul_2exp(&z.i[0], &x.i[0], C.mp_bitcnt_t(s))
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C._mpz_mul_2exp(&z.i[0], &x.i[0], C.ulong(s))
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return z
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}
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@ -273,7 +285,7 @@ func (z *Int) Lsh(x *Int, s uint) *Int {
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func (z *Int) Rsh(x *Int, s uint) *Int {
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x.doinit()
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z.doinit()
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C.mpz_div_2exp(&z.i[0], &x.i[0], C.mp_bitcnt_t(s))
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C._mpz_div_2exp(&z.i[0], &x.i[0], C.ulong(s))
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return z
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}
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@ -102,5 +102,5 @@ func main() {
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}
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}
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fmt.Printf("\n%d calls; bit sizes: %d %d %d\n", runtime.Cgocalls(), numer.Len(), accum.Len(), denom.Len())
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fmt.Printf("\n%d calls; bit sizes: %d %d %d\n", runtime.NumCgoCall(), numer.Len(), accum.Len(), denom.Len())
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}
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