mirror of
https://github.com/gonum/gonum.git
synced 2025-10-05 23:26:52 +08:00
3fa9374bd4
This merges the three packages, matrix, mat64, and cmat128. It then renames this big package to mat. It fixes the import statements and corresponding code
25 lines
722 B
Go
25 lines
722 B
Go
// Copyright ©2015 The gonum Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
//+build appengine
|
|
|
|
package mat
|
|
|
|
import "reflect"
|
|
|
|
var sizeOfFloat64 = int(reflect.TypeOf(float64(0)).Size())
|
|
|
|
// offset returns the number of float64 values b[0] is after a[0].
|
|
func offset(a, b []float64) int {
|
|
va0 := reflect.ValueOf(a).Index(0)
|
|
vb0 := reflect.ValueOf(b).Index(0)
|
|
if va0.Addr() == vb0.Addr() {
|
|
return 0
|
|
}
|
|
// This expression must be atomic with respect to GC moves.
|
|
// At this stage this is true, because the GC does not
|
|
// move. See https://golang.org/issue/12445.
|
|
return int(vb0.UnsafeAddr()-va0.UnsafeAddr()) / sizeOfFloat64
|
|
}
|