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diff --git a/ruy/opt_set.h b/ruy/opt_set.h
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+/* Copyright 2019 Google LLC. All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+==============================================================================*/
+
+#ifndef RUY_RUY_OPT_SET_H_
+#define RUY_RUY_OPT_SET_H_
+
+// RUY_OPT_SET is a compile-time API that Ruy provides for enabling/disabling
+// certain optimizations. It should be used by defining that macro on the
+// compiler command line.
+//
+// Each bit in RUY_OPT_SET controls a particular optimization done in Ruy.
+#define RUY_OPT_BIT_INTRINSICS 0x1
+#define RUY_OPT_BIT_ASM 0x2
+#define RUY_OPT_BIT_TUNING 0x4
+#define RUY_OPT_BIT_FAT_KERNEL 0x8
+// 0x10 used to be RUY_OPT_BIT_NATIVE_ROUNDING
+#define RUY_OPT_BIT_AVOID_ALIASING 0x20
+#define RUY_OPT_BIT_MAX_STREAMING 0x40
+#define RUY_OPT_BIT_PACK_AHEAD 0x80
+#define RUY_OPT_BIT_PREFETCH_LOAD 0x100
+#define RUY_OPT_BIT_PREFETCH_STORE 0x200
+#define RUY_OPT_BIT_FRACTAL_Z 0x400
+#define RUY_OPT_BIT_FRACTAL_U 0x800
+#define RUY_OPT_BIT_FRACTAL_HILBERT 0x1000
+
+#if !defined(RUY_OPT_SET)
+#ifdef RUY_OPTIMIZE_FOR_MATMUL_BENCHMARK
+// Load prefetching is detrimental in matrix multiplication benchmarks.
+// Store prefetching is not.
+#define RUY_OPT_SET (~RUY_OPT_BIT_PREFETCH_LOAD)
+#else
+// Default to all optimizations.
+#define RUY_OPT_SET (~0)
+#endif
+#endif
+
+#define RUY_OPT(X) ((RUY_OPT_SET & RUY_OPT_BIT_##X) != 0)
+
+#endif  // RUY_RUY_OPT_SET_H_