llvm-project/llvm/lib/Target/PowerPC/MCTargetDesc/PPCPredicates.h

//===-- PPCPredicates.h - PPC Branch Predicate Information ------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file describes the PowerPC branch predicates.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_TARGET_POWERPC_PPCPREDICATES_H
#define LLVM_TARGET_POWERPC_PPCPREDICATES_H

// GCC #defines PPC on Linux but we use it as our namespace name
#undef PPC

// Generated files will use "namespace PPC". To avoid symbol clash,
// undefine PPC here. PPC may be predefined on some hosts.
#undef PPC

namespace llvm {
namespace PPC {
  /// Predicate - These are "(BI << 5) | BO"  for various predicates.
  enum Predicate {
    PRED_LT     = (0 << 5) | 12,
    PRED_LE     = (1 << 5) |  4,
    PRED_EQ     = (2 << 5) | 12,
    PRED_GE     = (0 << 5) |  4,
    PRED_GT     = (1 << 5) | 12,
    PRED_NE     = (2 << 5) |  4,
    PRED_UN     = (3 << 5) | 12,
    PRED_NU     = (3 << 5) |  4
  };
  
  /// Invert the specified predicate.  != -> ==, < -> >=.
  Predicate InvertPredicate(Predicate Opcode);

  /// Assume the condition register is set by MI(a,b), return the predicate if
  /// we modify the instructions such that condition register is set by MI(b,a).
  Predicate getSwappedPredicate(Predicate Opcode);
}
}

#endif