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-rw-r--r--src/math/big/arith_amd64.go11
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diff --git a/src/math/big/arith_amd64.go b/src/math/big/arith_amd64.go
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+// Copyright 2017 The Go 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 !math_big_pure_go
+
+package big
+
+import "internal/cpu"
+
+var support_adx = cpu.X86.HasADX && cpu.X86.HasBMI2