Uniformity.h

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//===- Uniformity.h --------------------------------------*- C++ -*--------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
 
#ifndef LLVM_ADT_UNIFORMITY_H
#define LLVM_ADT_UNIFORMITY_H
 
namespace llvm {
 
/// Enum describing how values behave with respect to uniformity and
/// divergence, to answer the question: if the same instruction is executed by
/// two threads in a convergent set of threads, will its result value be
/// uniform, i.e. the same on both threads?
enum class ValueUniformity {
  /// The result value is uniform if and only if all operands are uniform.
  Default,
 
  /// The result value is always uniform.
  AlwaysUniform,
 
  /// The result value can never be assumed to be uniform.
  NeverUniform,
 
  /// The result value requires a custom uniformity check. A target-specific
  /// callback determines whether the result is uniform based on which
  /// operands are uniform.
  Custom
};
 
} // namespace llvm
#endif // LLVM_ADT_UNIFORMITY_H