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