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**PROGRAM:**

**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.

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