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