lli - man pages section 1: User Commands

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lli (1)

Name

lli - directly execute programs from LLVM bitcode

Synopsis

lli [options] [filename] [program args]

Description

LLI(1) LLVM LLI(1)

NAME
lli - directly execute programs from LLVM bitcode

SYNOPSIS
lli [options] [filename] [program args]

DESCRIPTION
lli directly executes programs in LLVM bitcode format. It takes a pro-
gram in LLVM bitcode format and executes it using a just-in-time com-
piler or an interpreter.

lli is not an emulator. It will not execute IR of different architec-
tures and it can only interpret (or JIT-compile) for the host architec-
ture.

The JIT compiler takes the same arguments as other tools, like llc, but
they don't necessarily work for the interpreter.

If filename is not specified, then lli reads the LLVM bitcode for the
program from standard input.

The optional args specified on the command line are passed to the pro-
gram as arguments.

GENERAL OPTIONS
-fake-argv0=executable
Override the argv[0] value passed into the executing program.

-force-interpreter={false,true}
If set to true, use the interpreter even if a just-in-time com-
piler is available for this architecture. Defaults to false.

-help Print a summary of command line options.

-load=pluginfilename
Causes lli to load the plugin (shared object) named pluginfile-
name and use it for optimization.

-stats Print statistics from the code-generation passes. This is only
meaningful for the just-in-time compiler, at present.

-time-passes
Record the amount of time needed for each code-generation pass
and print it to standard error.

-version
Print out the version of lli and exit without doing anything
else.

TARGET OPTIONS
-mtriple=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.

-march=arch
Specify the architecture for which to generate assembly, over-
riding the target encoded in the bitcode file. See the output
of llc -help for a list of valid architectures. By default this
is inferred from the target triple or autodetected to the cur-
rent architecture.

-mcpu=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: llvm-as < /dev/null | llc -march=xyz
-mcpu=help

-mattr=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: llvm-as < /dev/null | llc -march=xyz
-mattr=help

FLOATING POINT OPTIONS
-disable-excess-fp-precision
Disable optimizations that may increase floating point preci-
sion.

-enable-no-infs-fp-math
Enable optimizations that assume no Inf values.

-enable-no-nans-fp-math
Enable optimizations that assume no NAN values.

-enable-unsafe-fp-math
Causes lli to enable optimizations that may decrease floating
point precision.

-soft-float
Causes lli to generate software floating point library calls
instead of equivalent hardware instructions.

CODE GENERATION OPTIONS
-code-model=model
Choose the code model from:

default: Target default code model
tiny: Tiny code model
small: Small code model
kernel: Kernel code model
medium: Medium code model
large: Large code model

-disable-post-RA-scheduler
Disable scheduling after register allocation.

-disable-spill-fusing
Disable fusing of spill code into instructions.

-jit-enable-eh
Exception handling should be enabled in the just-in-time com-
piler.

-join-liveintervals
Coalesce copies (default=true).

-nozero-initialized-in-bss
Don't place zero-initialized symbols into the BSS section.

-pre-RA-sched=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

-regalloc=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

-relocation-model=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

-spiller
Spiller to use (default=local)

=simple: simple spiller
=local: local spiller

-x86-asm-syntax=syntax
Choose style of code to emit from X86 backend:

=att: Emit AT&T-style assembly
=intel: Emit Intel-style assembly

EXIT STATUS
If 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.

ATTRIBUTES
See attributes(7) for descriptions of the following attributes: