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annotate docs/BranchWeightMetadata.rst @ 107:a03ddd01be7e

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author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Sun, 31 Jan 2016 17:34:49 +0900
parents afa8332a0e37
children 1172e4bd9c6f
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1 ===========================
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2 LLVM Branch Weight Metadata
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3 ===========================
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4
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5 .. contents::
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6 :local:
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7
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8 Introduction
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9 ============
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10
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11 Branch Weight Metadata represents branch weights as its likeliness to be taken
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12 (see :doc:`BlockFrequencyTerminology`). Metadata is assigned to the
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13 ``TerminatorInst`` as a ``MDNode`` of the ``MD_prof`` kind. The first operator
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14 is always a ``MDString`` node with the string "branch_weights". Number of
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15 operators depends on the terminator type.
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16
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17 Branch weights might be fetch from the profiling file, or generated based on
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18 `__builtin_expect`_ instruction.
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19
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20 All weights are represented as an unsigned 32-bit values, where higher value
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21 indicates greater chance to be taken.
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22
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23 Supported Instructions
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24 ======================
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25
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26 ``BranchInst``
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27 ^^^^^^^^^^^^^^
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28
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29 Metadata is only assigned to the conditional branches. There are two extra
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30 operands for the true and the false branch.
0
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31
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32 .. code-block:: llvm
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33
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34 !0 = metadata !{
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35 metadata !"branch_weights",
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36 i32 <TRUE_BRANCH_WEIGHT>,
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37 i32 <FALSE_BRANCH_WEIGHT>
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38 }
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39
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40 ``SwitchInst``
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41 ^^^^^^^^^^^^^^
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42
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43 Branch weights are assigned to every case (including the ``default`` case which
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44 is always case #0).
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45
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46 .. code-block:: llvm
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47
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48 !0 = metadata !{
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49 metadata !"branch_weights",
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50 i32 <DEFAULT_BRANCH_WEIGHT>
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51 [ , i32 <CASE_BRANCH_WEIGHT> ... ]
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52 }
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53
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54 ``IndirectBrInst``
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55 ^^^^^^^^^^^^^^^^^^
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56
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57 Branch weights are assigned to every destination.
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58
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59 .. code-block:: llvm
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60
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61 !0 = metadata !{
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62 metadata !"branch_weights",
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63 i32 <LABEL_BRANCH_WEIGHT>
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64 [ , i32 <LABEL_BRANCH_WEIGHT> ... ]
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65 }
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66
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67 Other
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68 ^^^^^
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69
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70 Other terminator instructions are not allowed to contain Branch Weight Metadata.
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71
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72 .. _\__builtin_expect:
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73
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74 Built-in ``expect`` Instructions
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75 ================================
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76
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77 ``__builtin_expect(long exp, long c)`` instruction provides branch prediction
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78 information. The return value is the value of ``exp``.
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79
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80 It is especially useful in conditional statements. Currently Clang supports two
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81 conditional statements:
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82
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83 ``if`` statement
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84 ^^^^^^^^^^^^^^^^
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85
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86 The ``exp`` parameter is the condition. The ``c`` parameter is the expected
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87 comparison value. If it is equal to 1 (true), the condition is likely to be
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88 true, in other case condition is likely to be false. For example:
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89
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90 .. code-block:: c++
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91
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92 if (__builtin_expect(x > 0, 1)) {
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93 // This block is likely to be taken.
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94 }
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95
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96 ``switch`` statement
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97 ^^^^^^^^^^^^^^^^^^^^
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98
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99 The ``exp`` parameter is the value. The ``c`` parameter is the expected
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100 value. If the expected value doesn't show on the cases list, the ``default``
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101 case is assumed to be likely taken.
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102
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103 .. code-block:: c++
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104
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105 switch (__builtin_expect(x, 5)) {
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106 default: break;
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107 case 0: // ...
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108 case 3: // ...
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109 case 5: // This case is likely to be taken.
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110 }
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111
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112 CFG Modifications
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113 =================
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114
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115 Branch Weight Metatada is not proof against CFG changes. If terminator operands'
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116 are changed some action should be taken. In other case some misoptimizations may
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117 occur due to incorrect branch prediction information.
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118
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119 Function Entry Counts
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120 =====================
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121
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122 To allow comparing different functions during inter-procedural analysis and
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123 optimization, ``MD_prof`` nodes can also be assigned to a function definition.
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124 The first operand is a string indicating the name of the associated counter.
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125
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126 Currently, one counter is supported: "function_entry_count". This is a 64-bit
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127 counter that indicates the number of times that this function was invoked (in
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128 the case of instrumentation-based profiles). In the case of sampling-based
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129 profiles, this counter is an approximation of how many times the function was
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130 invoked.
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131
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132 For example, in the code below, the instrumentation for function foo()
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133 indicates that it was called 2,590 times at runtime.
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134
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135 .. code-block:: llvm
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 77
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136
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 77
diff changeset
137 define i32 @foo() !prof !1 {
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 77
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138 ret i32 0
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 77
diff changeset
139 }
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 77
diff changeset
140 !1 = !{!"function_entry_count", i64 2590}