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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 "unsafe"
- // offset returns the number of float64 values b[0] is after a[0].
- func offset(a, b []float64) int {
- if &a[0] == &b[0] {
- 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(uintptr(unsafe.Pointer(&b[0]))-uintptr(unsafe.Pointer(&a[0]))) / int(unsafe.Sizeof(float64(0)))
- }
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