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llvm-bcanalyzer-3.1.1.gz

LLVM-BCANALYZER(1)       LLVM Command Guide       LLVM-BCANALYZER(1)



NAME
       llvm-bcanalyzer - LLVM bitcode analyzer

SYNOPSIS
       llvm-bcanalyzer [options] [filename]

DESCRIPTION
       The llvm-bcanalyzer command is a small utility for analyzing
       bitcode files.  The tool reads a bitcode file (such as
       generated with the llvm-as tool) and produces a statistical
       report on the contents of the bitcode file.  The tool can
       also dump a low level but human readable version of the
       bitcode file.  This tool is probably not of much interest or
       utility except for those working directly with the bitcode
       file format. Most LLVM users can just ignore this tool.

       If filename is omitted or is "-", then llvm-bcanalyzer reads
       its input from standard input. This is useful for combining
       the tool into a pipeline.  Output is written to the standard
       output.

OPTIONS
       -nodetails
           Causes llvm-bcanalyzer to abbreviate its output by
           writing out only a module level summary. The details for
           individual functions are not displayed.

       -dump
           Causes llvm-bcanalyzer to dump the bitcode in a human
           readable format. This format is significantly different
           from LLVM assembly and provides details about the
           encoding of the bitcode file.

       -verify
           Causes llvm-bcanalyzer to verify the module produced by
           reading the bitcode. This ensures that the statistics
           generated are based on a consistent module.

       -help
           Print a summary of command line options.

EXIT STATUS
       If llvm-bcanalyzer succeeds, it will exit with 0.  Otherwise,
       if an error occurs, it will exit with a non-zero value,
       usually 1.

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.

SEE ALSO
       llvm-dis, <http://llvm.org/docs/BitCodeFormat.html>

AUTHORS
       Maintained by the LLVM Team (<http://llvm.org/>).



CVS                          2011-04-15           LLVM-BCANALYZER(1)
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