1 //===- Uniformity.h --------------------------------------*- C++ -*--------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #ifndef LLVM_ADT_UNIFORMITY_H
10 #define LLVM_ADT_UNIFORMITY_H
11 
12 namespace llvm {
13 
14 /// Enum describing how instructions behave with respect to uniformity and
15 /// divergence, to answer the question: if the same instruction is executed by
16 /// two threads in a convergent set of threads, will its result value(s) be
17 /// uniform, i.e. the same on both threads?
18 enum class InstructionUniformity {
19   /// The result values are uniform if and only if all operands are uniform.
20   Default,
21 
22   /// The result values are always uniform.
23   AlwaysUniform,
24 
25   /// The result values can never be assumed to be uniform.
26   NeverUniform
27 };
28 
29 } // namespace llvm
30 #endif // LLVM_ADT_UNIFORMITY_H
31