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 //
10 //===----------------------------------------------------------------------===//
11 
12 #ifndef LLVM_ADT_UNIFORMITY_H
13 #define LLVM_ADT_UNIFORMITY_H
14 
15 namespace llvm {
16 
17 /// Enum describing how instructions behave with respect to uniformity and
18 /// divergence, to answer the question: if the same instruction is executed by
19 /// two threads in a convergent set of threads, will its result value(s) be
20 /// uniform, i.e. the same on both threads?
21 enum class InstructionUniformity {
22   /// The result values are uniform if and only if all operands are uniform.
23   Default,
24 
25   /// The result values are always uniform.
26   AlwaysUniform,
27 
28   /// The result values can never be assumed to be uniform.
29   NeverUniform
30 };
31 
32 } // namespace llvm
33 #endif // LLVM_ADT_UNIFORMITY_H
34