=pod
=head1 NAME
lli - directly execute programs from LLVM bitcode
=head1 SYNOPSIS
B<lli> [I<options>] [I<filename>] [I<program args>]
=head1 DESCRIPTION
B<lli> directly executes programs in LLVM bitcode format. It takes a program
in LLVM bitcode format and executes it using a just-in-time compiler, if one is
available for the current architecture, or an interpreter. B<lli> takes all of
the same code generator options as L<llc|llc>, but they are only effective when
B<lli> is using the just-in-time compiler.
If I<filename> is not specified, then B<lli> reads the LLVM bitcode for the
program from standard input.
The optional I<args> specified on the command line are passed to the program as
arguments.
=head1 GENERAL OPTIONS
=over
=item B<-fake-argv0>=I<executable>
Override the C<argv[0]> value passed into the executing program.
=item B<-force-interpreter>=I<{false,true}>
If set to true, use the interpreter even if a just-in-time compiler is available
for this architecture. Defaults to false.
=item B<-help>
Print a summary of command line options.
=item B<-load>=I<puginfilename>
Causes B<lli> to load the plugin (shared object) named I<pluginfilename> and use
it for optimization.
=item B<-stats>
Print statistics from the code-generation passes. This is only meaningful for
the just-in-time compiler, at present.
=item B<-time-passes>
Record the amount of time needed for each code-generation pass and print it to
standard error.
=item B<-version>
Print out the version of B<lli> and exit without doing anything else.
=back
=head1 TARGET OPTIONS
=over
=item B<-mtriple>=I<target triple>
Override the target triple specified in the input bitcode file with the
specified string. This may result in a crash if you pick an
architecture which is not compatible with the current system.
=item B<-march>=I<arch>
Specify the architecture for which to generate assembly, overriding the target
encoded in the bitcode file. See the output of B<llc --help> for a list of
valid architectures. By default this is inferred from the target triple or
autodetected to the current architecture.
=item B<-mcpu>=I<cpuname>
Specify a specific chip in the current architecture to generate code for.
By default this is inferred from the target triple and autodetected to
the current architecture. For a list of available CPUs, use:
B<llvm-as E<lt> /dev/null | llc -march=xyz -mcpu=help>
=item B<-mattr>=I<a1,+a2,-a3,...>
Override or control specific attributes of the target, such as whether SIMD
operations are enabled or not. The default set of attributes is set by the
current CPU. For a list of available attributes, use:
B<llvm-as E<lt> /dev/null | llc -march=xyz -mattr=help>
=back
=head1 FLOATING POINT OPTIONS
=over
=item B<-disable-excess-fp-precision>
Disable optimizations that may increase floating point precision.
=item B<-enable-finite-only-fp-math>
Enable optimizations that assumes only finite floating point math. That is,
there is no NAN or Inf values.
=item B<-enable-unsafe-fp-math>
Causes B<lli> to enable optimizations that may decrease floating point
precision.
=item B<-soft-float>
Causes B<lli> to generate software floating point library calls instead of
equivalent hardware instructions.
=back
=head1 CODE GENERATION OPTIONS
=over
=item B<-code-model>=I<model>
Choose the code model from:
default: Target default code model
small: Small code model
kernel: Kernel code model
medium: Medium code model
large: Large code model
=item B<-disable-post-RA-scheduler>
Disable scheduling after register allocation.
=item B<-disable-spill-fusing>
Disable fusing of spill code into instructions.
=item B<-enable-correct-eh-support>
Make the -lowerinvoke pass insert expensive, but correct, EH code.
=item B<-enable-eh>
Exception handling should be emitted.
=item B<-join-liveintervals>
Coalesce copies (default=true).
=item B<-nozero-initialized-in-bss>
Don't place zero-initialized symbols into the BSS section.
=item B<-pre-RA-sched>=I<scheduler>
Instruction schedulers available (before register allocation):
=default: Best scheduler for the target
=none: No scheduling: breadth first sequencing
=simple: Simple two pass scheduling: minimize critical path and maximize processor utilization
=simple-noitin: Simple two pass scheduling: Same as simple except using generic latency
=list-burr: Bottom-up register reduction list scheduling
=list-tdrr: Top-down register reduction list scheduling
=list-td: Top-down list scheduler -print-machineinstrs - Print generated machine code
=item B<-regalloc>=I<allocator>
Register allocator to use: (default = linearscan)
=bigblock: Big-block register allocator
=linearscan: linear scan register allocator =local - local register allocator
=simple: simple register allocator
=item B<-relocation-model>=I<model>
Choose relocation model from:
=default: Target default relocation model
=static: Non-relocatable code =pic - Fully relocatable, position independent code
=dynamic-no-pic: Relocatable external references, non-relocatable code
=item B<-spiller>
Spiller to use: (default: local)
=simple: simple spiller
=local: local spiller
=item B<-x86-asm-syntax>=I<syntax>
Choose style of code to emit from X86 backend:
=att: Emit AT&T-style assembly
=intel: Emit Intel-style assembly
=back
=head1 EXIT STATUS
If B<lli> fails to load the program, it will exit with an exit code of 1.
Otherwise, it will return the exit code of the program it executes.
=head1 SEE ALSO
L<llc|llc>
=head1 AUTHOR
Maintained by the LLVM Team (L<http://llvm.org>).
=cut