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25 lines
724 B
Go
25 lines
724 B
Go
// Copyright ©2015 The gonum Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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//+build appengine
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package mat64
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import "reflect"
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var sizeOfFloat64 = int(reflect.TypeOf(float64(0)).Size())
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// offset returns the number of float64 values b[0] is after a[0].
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func offset(a, b []float64) int {
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va0 := reflect.ValueOf(a).Index(0)
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vb0 := reflect.ValueOf(b).Index(0)
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if va0.Addr() == vb0.Addr() {
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return 0
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}
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// This expression must be atomic with respect to GC moves.
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// At this stage this is true, because the GC does not
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// move. See https://golang.org/issue/12445.
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return int(vb0.UnsafeAddr()-va0.UnsafeAddr()) / sizeOfFloat64
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}
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