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.TH "LLVM-BCANALYZER" "1" "2016-07-10" "3.8" "LLVM"

.SH NAME

llvm-bcanalyzer \- LLVM bitcode analyzer

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.SH SYNOPSIS

.sp

\fBllvm\-bcanalyzer\fP [\fIoptions\fP] [\fIfilename\fP]

.SH DESCRIPTION

.sp

The \fBllvm\-bcanalyzer\fP command is a small utility for analyzing bitcode

files.  The tool reads a bitcode file (such as generated with the

\fBllvm\-as\fP 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.

.sp

If \fIfilename\fP is omitted or is \fB\-\fP, then \fBllvm\-bcanalyzer\fP reads its

input from standard input.  This is useful for combining the tool into a

pipeline.  Output is written to the standard output.

.SH OPTIONS

.INDENT 0.0

.TP

.B \-nodetails

Causes \fBllvm\-bcanalyzer\fP to abbreviate its output by writing out only

a module level summary.  The details for individual functions are not

displayed.

.UNINDENT

.INDENT 0.0

.TP

.B \-dump

Causes \fBllvm\-bcanalyzer\fP 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.

.UNINDENT

.INDENT 0.0

.TP

.B \-verify

Causes \fBllvm\-bcanalyzer\fP to verify the module produced by reading the

bitcode.  This ensures that the statistics generated are based on a consistent

module.

.UNINDENT

.INDENT 0.0

.TP

.B \-help

Print a summary of command line options.

.UNINDENT

.SH EXIT STATUS

.sp

If \fBllvm\-bcanalyzer\fP succeeds, it will exit with 0.  Otherwise, if an

error occurs, it will exit with a non\-zero value, usually 1.

.SH SUMMARY OUTPUT DEFINITIONS

.sp

The following items are always printed by llvm\-bcanalyzer.  They comprize the

summary output.

.sp

\fBBitcode Analysis Of Module\fP

.INDENT 0.0

.INDENT 3.5

This just provides the name of the module for which bitcode analysis is being

generated.

.UNINDENT

.UNINDENT

.sp

\fBBitcode Version Number\fP

.INDENT 0.0

.INDENT 3.5

The bitcode version (not LLVM version) of the file read by the analyzer.

.UNINDENT

.UNINDENT

.sp

\fBFile Size\fP

.INDENT 0.0

.INDENT 3.5

The size, in bytes, of the entire bitcode file.

.UNINDENT

.UNINDENT

.sp

\fBModule Bytes\fP

.INDENT 0.0

.INDENT 3.5

The size, in bytes, of the module block.  Percentage is relative to File Size.

.UNINDENT

.UNINDENT

.sp

\fBFunction Bytes\fP

.INDENT 0.0

.INDENT 3.5

The size, in bytes, of all the function blocks.  Percentage is relative to File

Size.

.UNINDENT

.UNINDENT

.sp

\fBGlobal Types Bytes\fP

.INDENT 0.0

.INDENT 3.5

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.

.UNINDENT

.UNINDENT

.sp

\fBConstant Pool Bytes\fP

.INDENT 0.0

.INDENT 3.5

The size, in bytes, of the Constant Pool Blocks Percentage is relative to File

Size.

.UNINDENT

.UNINDENT

.sp

\fBModule Globals Bytes\fP

.INDENT 0.0

.INDENT 3.5

Ths size, in bytes, of the Global Variable Definitions and their initializers.

Percentage is relative to File Size.

.UNINDENT

.UNINDENT

.sp

\fBInstruction List Bytes\fP

.INDENT 0.0

.INDENT 3.5

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.

.UNINDENT

.UNINDENT

.sp

\fBCompaction Table Bytes\fP

.INDENT 0.0

.INDENT 3.5

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.

.UNINDENT

.UNINDENT

.sp

\fBSymbol Table Bytes\fP

.INDENT 0.0

.INDENT 3.5

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.

.UNINDENT

.UNINDENT

.sp

\fBDependent Libraries Bytes\fP

.INDENT 0.0

.INDENT 3.5

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.

.UNINDENT

.UNINDENT

.sp

\fBNumber Of Bitcode Blocks\fP

.INDENT 0.0

.INDENT 3.5

The total number of blocks of any kind in the bitcode file.

.UNINDENT

.UNINDENT

.sp

\fBNumber Of Functions\fP

.INDENT 0.0

.INDENT 3.5

The total number of function definitions in the bitcode file.

.UNINDENT

.UNINDENT

.sp

\fBNumber Of Types\fP

.INDENT 0.0

.INDENT 3.5

The total number of types defined in the Global Types Pool.

.UNINDENT

.UNINDENT

.sp

\fBNumber Of Constants\fP

.INDENT 0.0

.INDENT 3.5

The total number of constants (of any type) defined in the Constant Pool.

.UNINDENT

.UNINDENT

.sp

\fBNumber Of Basic Blocks\fP

.INDENT 0.0

.INDENT 3.5

The total number of basic blocks defined in all functions in the bitcode file.

.UNINDENT

.UNINDENT

.sp

\fBNumber Of Instructions\fP

.INDENT 0.0

.INDENT 3.5

The total number of instructions defined in all functions in the bitcode file.

.UNINDENT

.UNINDENT

.sp

\fBNumber Of Long Instructions\fP

.INDENT 0.0

.INDENT 3.5

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.

.UNINDENT

.UNINDENT

.sp

\fBNumber Of Operands\fP

.INDENT 0.0

.INDENT 3.5

The total number of operands used in all instructions in the bitcode file.

.UNINDENT

.UNINDENT

.sp

\fBNumber Of Compaction Tables\fP

.INDENT 0.0

.INDENT 3.5

The total number of compaction tables in all functions in the bitcode file.

.UNINDENT

.UNINDENT

.sp

\fBNumber Of Symbol Tables\fP

.INDENT 0.0

.INDENT 3.5

The total number of symbol tables in all functions in the bitcode file.

.UNINDENT

.UNINDENT

.sp

\fBNumber Of Dependent Libs\fP

.INDENT 0.0

.INDENT 3.5

The total number of dependent libraries found in the bitcode file.

.UNINDENT

.UNINDENT

.sp

\fBTotal Instruction Size\fP

.INDENT 0.0

.INDENT 3.5

The total size of the instructions in all functions in the bitcode file.

.UNINDENT

.UNINDENT

.sp

\fBAverage Instruction Size\fP

.INDENT 0.0

.INDENT 3.5

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.

.UNINDENT

.UNINDENT

.sp

\fBMaximum Type Slot Number\fP

.INDENT 0.0

.INDENT 3.5

The maximum value used for a type\(aqs slot number.  Larger slot number values take

more bytes to encode.

.UNINDENT

.UNINDENT

.sp

\fBMaximum Value Slot Number\fP

.INDENT 0.0

.INDENT 3.5

The maximum value used for a value\(aqs slot number.  Larger slot number values take

more bytes to encode.

.UNINDENT

.UNINDENT

.sp

\fBBytes Per Value\fP

.INDENT 0.0

.INDENT 3.5

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.

.UNINDENT

.UNINDENT

.sp

\fBBytes Per Global\fP

.INDENT 0.0

.INDENT 3.5

The average size of a global definition (constants and global variables).

.UNINDENT

.UNINDENT

.sp

\fBBytes Per Function\fP

.INDENT 0.0

.INDENT 3.5

The average number of bytes per function definition.  This is computed by

dividing Function Bytes by Number Of Functions.

.UNINDENT

.UNINDENT

.sp

\fB# of VBR 32\-bit Integers\fP

.INDENT 0.0

.INDENT 3.5

The total number of 32\-bit integers encoded using the Variable Bit Rate

encoding scheme.

.UNINDENT

.UNINDENT

.sp

\fB# of VBR 64\-bit Integers\fP

.INDENT 0.0

.INDENT 3.5

The total number of 64\-bit integers encoded using the Variable Bit Rate encoding

scheme.

.UNINDENT

.UNINDENT

.sp

\fB# of VBR Compressed Bytes\fP

.INDENT 0.0

.INDENT 3.5

The total number of bytes consumed by the 32\-bit and 64\-bit integers that use

the Variable Bit Rate encoding scheme.

.UNINDENT

.UNINDENT

.sp

\fB# of VBR Expanded Bytes\fP

.INDENT 0.0

.INDENT 3.5

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.

.UNINDENT

.UNINDENT

.sp

\fBBytes Saved With VBR\fP

.INDENT 0.0

.INDENT 3.5

The total number of bytes saved by using the Variable Bit Rate encoding scheme.

The percentage is relative to # of VBR Expanded Bytes.

.UNINDENT

.UNINDENT

.SH DETAILED OUTPUT DEFINITIONS

.sp

The following definitions occur only if the \-nodetails option was not given.

The detailed output provides additional information on a per\-function basis.

.sp

\fBType\fP

.INDENT 0.0

.INDENT 3.5

The type signature of the function.

.UNINDENT

.UNINDENT

.sp

\fBByte Size\fP

.INDENT 0.0

.INDENT 3.5

The total number of bytes in the function\(aqs block.

.UNINDENT

.UNINDENT

.sp

\fBBasic Blocks\fP

.INDENT 0.0

.INDENT 3.5

The number of basic blocks defined by the function.

.UNINDENT

.UNINDENT

.sp

\fBInstructions\fP

.INDENT 0.0

.INDENT 3.5

The number of instructions defined by the function.

.UNINDENT

.UNINDENT

.sp

\fBLong Instructions\fP

.INDENT 0.0

.INDENT 3.5

The number of instructions using the long instruction format in the function.

.UNINDENT

.UNINDENT

.sp

\fBOperands\fP

.INDENT 0.0

.INDENT 3.5

The number of operands used by all instructions in the function.

.UNINDENT

.UNINDENT

.sp

\fBInstruction Size\fP

.INDENT 0.0

.INDENT 3.5

The number of bytes consumed by instructions in the function.

.UNINDENT

.UNINDENT

.sp

\fBAverage Instruction Size\fP

.INDENT 0.0

.INDENT 3.5

The average number of bytes consumed by the instructions in the function.

This value is computed by dividing Instruction Size by Instructions.

.UNINDENT

.UNINDENT

.sp

\fBBytes Per Instruction\fP

.INDENT 0.0

.INDENT 3.5

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.

.UNINDENT

.UNINDENT

.sp

\fBNumber of VBR 32\-bit Integers\fP

.INDENT 0.0

.INDENT 3.5

The total number of 32\-bit integers found in this function (for any use).

.UNINDENT

.UNINDENT

.sp

\fBNumber of VBR 64\-bit Integers\fP

.INDENT 0.0

.INDENT 3.5

The total number of 64\-bit integers found in this function (for any use).

.UNINDENT

.UNINDENT

.sp

\fBNumber of VBR Compressed Bytes\fP

.INDENT 0.0

.INDENT 3.5

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.

.UNINDENT

.UNINDENT

.sp

\fBNumber of VBR Expanded Bytes\fP

.INDENT 0.0

.INDENT 3.5

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.

.UNINDENT

.UNINDENT

.sp

\fBBytes Saved With VBR\fP

.INDENT 0.0

.INDENT 3.5

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.

.UNINDENT

.UNINDENT

.SH SEE ALSO

.sp

/CommandGuide/llvm\-dis, /BitCodeFormat

.SH AUTHOR

Maintained by The LLVM Team (http://llvm.org/).

.SH COPYRIGHT

2003-2016, LLVM Project

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