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| 14 | pmbaty | 1 | //===- Uniformity.h --------------------------------------*- C++ -*--------===// |
| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // |
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| 9 | // |
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| 10 | //===----------------------------------------------------------------------===// |
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| 11 | |||
| 12 | #ifndef LLVM_ADT_UNIFORMITY_H |
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| 13 | #define LLVM_ADT_UNIFORMITY_H |
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| 14 | |||
| 15 | namespace llvm { |
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| 16 | |||
| 17 | /// Enum describing how instructions behave with respect to uniformity and |
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| 18 | /// divergence, to answer the question: if the same instruction is executed by |
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| 19 | /// two threads in a convergent set of threads, will its result value(s) be |
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| 20 | /// uniform, i.e. the same on both threads? |
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| 21 | enum class InstructionUniformity { |
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| 22 | /// The result values are uniform if and only if all operands are uniform. |
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| 23 | Default, |
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| 24 | |||
| 25 | /// The result values are always uniform. |
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| 26 | AlwaysUniform, |
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| 27 | |||
| 28 | /// The result values can never be assumed to be uniform. |
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| 29 | NeverUniform |
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| 30 | }; |
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| 31 | |||
| 32 | } // namespace llvm |
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| 33 | #endif // LLVM_ADT_UNIFORMITY_H |