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- // 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 safe
- 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
- }
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