Provided by: llvm-8_8.0.1-9_amd64 
NAME
llvm-profdata - Profile data tool
SYNOPSIS
llvm-profdata command [args…]
DESCRIPTION
The llvm-profdata tool is a small utility for working with profile data files.
COMMANDS
• merge
• show
MERGE
SYNOPSIS
llvm-profdata merge [options] [filename…]
DESCRIPTION
llvm-profdata merge takes several profile data files generated by PGO instrumentation and merges them
together into a single indexed profile data file.
By default profile data is merged without modification. This means that the relative importance of each
input file is proportional to the number of samples or counts it contains. In general, the input from a
longer training run will be interpreted as relatively more important than a shorter run. Depending on the
nature of the training runs it may be useful to adjust the weight given to each input file by using the
-weighted-input option.
Profiles passed in via -weighted-input, -input-files, or via positional arguments are processed once for
each time they are seen.
OPTIONS
-help Print a summary of command line options.
-output=output, -o=output
Specify the output file name. Output cannot be - as the resulting indexed profile data can’t be
written to standard output.
-weighted-input=weight,filename
Specify an input file name along with a weight. The profile counts of the supplied filename will
be scaled (multiplied) by the supplied weight, where where weight is a decimal integer >= 1.
Input files specified without using this option are assigned a default weight of 1. Examples are
shown below.
-input-files=path, -f=path
Specify a file which contains a list of files to merge. The entries in this file are
newline-separated. Lines starting with ‘#’ are skipped. Entries may be of the form <filename> or
<weight>,<filename>.
-remapping-file=path, -r=path
Specify a file which contains a remapping from symbol names in the input profile to the symbol
names that should be used in the output profile. The file should consist of lines of the form
<input-symbol> <output-symbol>. Blank lines and lines starting with # are skipped.
The llvm-cxxmap tool can be used to generate the symbol remapping file.
-instr (default)
Specify that the input profile is an instrumentation-based profile.
-sample
Specify that the input profile is a sample-based profile.
The format of the generated file can be generated in one of three ways:
-binary (default)
Emit the profile using a binary encoding. For instrumentation-based profile the output format is
the indexed binary format.
-text
Emit the profile in text mode. This option can also be used with both sample-based and
instrumentation-based profile. When this option is used the profile will be dumped in the text
format that is parsable by the profile reader.
-gcc
Emit the profile using GCC’s gcov format (Not yet supported).
-sparse[=true|false]
Do not emit function records with 0 execution count. Can only be used in conjunction with -instr.
Defaults to false, since it can inhibit compiler optimization during PGO.
-num-threads=N, -j=N
Use N threads to perform profile merging. When N=0, llvm-profdata auto-detects an appropriate
number of threads to use. This is the default.
EXAMPLES
Basic Usage
Merge three profiles:
llvm-profdata merge foo.profdata bar.profdata baz.profdata -output merged.profdata
Weighted Input
The input file foo.profdata is especially important, multiply its counts by 10:
llvm-profdata merge -weighted-input=10,foo.profdata bar.profdata baz.profdata -output merged.profdata
Exactly equivalent to the previous invocation (explicit form; useful for programmatic invocation):
llvm-profdata merge -weighted-input=10,foo.profdata -weighted-input=1,bar.profdata -weighted-input=1,baz.profdata -output merged.profdata
SHOW
SYNOPSIS
llvm-profdata show [options] [filename]
DESCRIPTION
llvm-profdata show takes a profile data file and displays the information about the profile counters for
this file and for any of the specified function(s).
If filename is omitted or is -, then llvm-profdata show reads its input from standard input.
OPTIONS
-all-functions
Print details for every function.
-counts
Print the counter values for the displayed functions.
-function=string
Print details for a function if the function’s name contains the given string.
-help Print a summary of command line options.
-output=output, -o=output
Specify the output file name. If output is - or it isn’t specified, then the output is sent to
standard output.
-instr (default)
Specify that the input profile is an instrumentation-based profile.
-text Instruct the profile dumper to show profile counts in the text format of the instrumentation-based
profile data representation. By default, the profile information is dumped in a more human
readable form (also in text) with annotations.
-topn=n
Instruct the profile dumper to show the top n functions with the hottest basic blocks in the
summary section. By default, the topn functions are not dumped.
-sample
Specify that the input profile is a sample-based profile.
-memop-sizes
Show the profiled sizes of the memory intrinsic calls for shown functions.
-value-cutoff=n
Show only those functions whose max count values are greater or equal to n. By default, the
value-cutoff is set to 0.
-list-below-cutoff
Only output names of functions whose max count value are below the cutoff value.
EXIT STATUS
llvm-profdata returns 1 if the command is omitted or is invalid, if it cannot read input files, or if
there is a mismatch between their data.
AUTHOR
Maintained by the LLVM Team (https://llvm.org/).
COPYRIGHT
2003-2020, LLVM Project
8 2020-03-19 LLVM-PROFDATA(1)