llvm-profgen - LLVM SPGO profile generation tool#

SYNOPSIS#

llvm-profgen [commands] [options]

DESCRIPTION#

The llvm-profgen utility generates a profile data file from given perf script data files for sample-based profile guided optimization(SPGO).

COMMANDS#

At least one of the following commands are required:

--perfscript=<string[,string,...]>#: Path of perf-script trace created by Linux perf tool with script command(the raw perf.data should be profiled with -b).

--etm=<string>#: Path of the ETM trace file created by ARM CoreSight trace tools. Requires the OpenCSD library version 1.5.4 or higher to be enabled during the build.

--perfdata=<perfdata>, --pd#: Path of raw perf data created by Linux perf tool (it should be profiled with -b).

--unsymbolized-profile=<unsymbolized profile>, --up#: Path of the unsymbolized profile created by llvm-profgen with --skip-symbolization.

--llvm-sample-profile=<llvm sample profile>#: Path of the LLVM sample profile.

Note

Only one of --perfscript, --perfdata, --unsymbolized-profile, --llvm-sample-profile, or --etm may be specified at a time.

--binary=<string[,string,...]>#: Path of the input profiled binary files.

--output=<string>#: Path of the output profile file.

OPTIONS#

llvm-profgen supports the following options:

--format=[text|binary|extbinary|compbinary|gcc]#: Specify the format of the generated profile. Supported <format> are text, binary, extbinary, compbinary, gcc, see llvm-profdata for more descriptions of the format.

--show-mmap-events#: Print mmap events.

--show-disassembly#: Print disassembled code.

--x86-asm-syntax=[att|intel]#: Specify whether to print assembly code in AT&T syntax (the default) or Intel syntax.

--debug-binary=<debug-binary>#: Path of debug info binary. llvm-profgen will load the DWARF info from it instead of the executable binary.

--target-triple=<triple>#: Override the target triple for the binary. This is useful for ETM trace decoding to specify the correct Arm M-profile target.

--pid#: Process Id for the profiled executable binary.

--output=<output>#: Path of the output profile file.

--data-access-perftrace=<data-access-perftrace>#: File path of a Linux perf raw trace (generated by perf report -D) consisting of memory access events.