| Stephen Hines | c6ca60f | 2023-05-09 02:19:22 -0700 | [diff] [blame^] | 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 |