1//===-- PPCPredicates.h - PPC Branch Predicate Information ------*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file describes the PowerPC branch predicates.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef LLVM_TARGET_POWERPC_PPCPREDICATES_H
15#define LLVM_TARGET_POWERPC_PPCPREDICATES_H
16
17// GCC #defines PPC on Linux but we use it as our namespace name
18#undef PPC
19
20// Generated files will use "namespace PPC". To avoid symbol clash,
21// undefine PPC here. PPC may be predefined on some hosts.
22#undef PPC
23
24namespace llvm {
25namespace PPC {
26  /// Predicate - These are "(BI << 5) | BO"  for various predicates.
27  enum Predicate {
28    PRED_LT     = (0 << 5) | 12,
29    PRED_LE     = (1 << 5) |  4,
30    PRED_EQ     = (2 << 5) | 12,
31    PRED_GE     = (0 << 5) |  4,
32    PRED_GT     = (1 << 5) | 12,
33    PRED_NE     = (2 << 5) |  4,
34    PRED_UN     = (3 << 5) | 12,
35    PRED_NU     = (3 << 5) |  4
36  };
37
38  /// Invert the specified predicate.  != -> ==, < -> >=.
39  Predicate InvertPredicate(Predicate Opcode);
40
41  /// Assume the condition register is set by MI(a,b), return the predicate if
42  /// we modify the instructions such that condition register is set by MI(b,a).
43  Predicate getSwappedPredicate(Predicate Opcode);
44}
45}
46
47#endif
48