SUMMARY OUTPUT DEFINITIONS¶
The following items are always printed by llvm-bcanalyzer. They
comprize the summary output.
Bitcode Analysis Of Module
This just provides the name of the module for which
bitcode analysis is being generated.
Bitcode Version Number
The bitcode version (not LLVM version) of the file read
by the analyzer.
File Size
The size, in bytes, of the entire bitcode file.
Module Bytes
The size, in bytes, of the module block. Percentage is
relative to File Size.
Function Bytes
The size, in bytes, of all the function blocks.
Percentage is relative to File Size.
Global Types Bytes
The size, in bytes, of the Global Types Pool. Percentage
is relative to File Size. This is the size of the definitions of all types in
the bitcode file.
Constant Pool Bytes
The size, in bytes, of the Constant Pool Blocks
Percentage is relative to File Size.
Module Globals Bytes
Ths size, in bytes, of the Global Variable Definitions
and their initializers. Percentage is relative to File Size.
Instruction List Bytes
The size, in bytes, of all the instruction lists in all
the functions. Percentage is relative to File Size. Note that this value is
also included in the Function Bytes.
Compaction Table Bytes
The size, in bytes, of all the compaction tables in all
the functions. Percentage is relative to File Size. Note that this value is
also included in the Function Bytes.
Symbol Table Bytes
The size, in bytes, of all the symbol tables in all the
functions. Percentage is relative to File Size. Note that this value is also
included in the Function Bytes.
Dependent Libraries Bytes
The size, in bytes, of the list of dependent libraries in
the module. Percentage is relative to File Size. Note that this value is also
included in the Module Global Bytes.
Number Of Bitcode Blocks
The total number of blocks of any kind in the bitcode
file.
Number Of Functions
The total number of function definitions in the bitcode
file.
Number Of Types
The total number of types defined in the Global Types
Pool.
Number Of Constants
The total number of constants (of any type) defined in
the Constant Pool.
Number Of Basic Blocks
The total number of basic blocks defined in all functions
in the bitcode file.
Number Of Instructions
The total number of instructions defined in all functions
in the bitcode file.
Number Of Long Instructions
The total number of long instructions defined in all
functions in the bitcode file. Long instructions are those taking greater than
4 bytes. Typically long instructions are GetElementPtr with several indices,
PHI nodes, and calls to functions with large numbers of arguments.
Number Of Operands
The total number of operands used in all instructions in
the bitcode file.
Number Of Compaction Tables
The total number of compaction tables in all functions in
the bitcode file.
Number Of Symbol Tables
The total number of symbol tables in all functions in the
bitcode file.
Number Of Dependent Libs
The total number of dependent libraries found in the
bitcode file.
Total Instruction Size
The total size of the instructions in all functions in
the bitcode file.
Average Instruction Size
The average number of bytes per instruction across all
functions in the bitcode file. This value is computed by dividing Total
Instruction Size by Number Of Instructions.
Maximum Type Slot Number
The maximum value used for a type’s slot number.
Larger slot number values take more bytes to encode.
Maximum Value Slot Number
The maximum value used for a value’s slot number.
Larger slot number values take more bytes to encode.
Bytes Per Value
The average size of a Value definition (of any type).
This is computed by dividing File Size by the total number of values of any
type.
Bytes Per Global
The average size of a global definition (constants and
global variables).
Bytes Per Function
The average number of bytes per function definition. This
is computed by dividing Function Bytes by Number Of Functions.
# of VBR 32-bit Integers
The total number of 32-bit integers encoded using the
Variable Bit Rate encoding scheme.
# of VBR 64-bit Integers
The total number of 64-bit integers encoded using the
Variable Bit Rate encoding scheme.
# of VBR Compressed Bytes
The total number of bytes consumed by the 32-bit and
64-bit integers that use the Variable Bit Rate encoding scheme.
# of VBR Expanded Bytes
The total number of bytes that would have been consumed
by the 32-bit and 64-bit integers had they not been compressed with the
Variable Bit Rage encoding scheme.
Bytes Saved With VBR
The total number of bytes saved by using the Variable Bit
Rate encoding scheme. The percentage is relative to # of VBR Expanded
Bytes.
DETAILED OUTPUT DEFINITIONS¶
The following definitions occur only if the -nodetails option was
not given. The detailed output provides additional information on a
per-function basis.
Type
The type signature of the function.
Byte Size
The total number of bytes in the function’s
block.
Basic Blocks
The number of basic blocks defined by the function.
Instructions
The number of instructions defined by the function.
Long Instructions
The number of instructions using the long instruction
format in the function.
Operands
The number of operands used by all instructions in the
function.
Instruction Size
The number of bytes consumed by instructions in the
function.
Average Instruction Size
The average number of bytes consumed by the instructions
in the function. This value is computed by dividing Instruction Size by
Instructions.
Bytes Per Instruction
The average number of bytes used by the function per
instruction. This value is computed by dividing Byte Size by Instructions.
Note that this is not the same as Average Instruction Size. It computes a
number relative to the total function size not just the size of the
instruction list.
Number of VBR 32-bit Integers
The total number of 32-bit integers found in this
function (for any use).
Number of VBR 64-bit Integers
The total number of 64-bit integers found in this
function (for any use).
Number of VBR Compressed Bytes
The total number of bytes in this function consumed by
the 32-bit and 64-bit integers that use the Variable Bit Rate encoding
scheme.
Number of VBR Expanded Bytes
The total number of bytes in this function that would
have been consumed by the 32-bit and 64-bit integers had they not been
compressed with the Variable Bit Rate encoding scheme.
Bytes Saved With VBR
The total number of bytes saved in this function by using
the Variable Bit Rate encoding scheme. The percentage is relative to # of VBR
Expanded Bytes.
