


LLI(1)                  LLVM Command Guide                 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
       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.  lli takes all of the same code generator options as llc,
       but they are only effective when lli is using the just-in-time
       compiler.

       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
       program 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 compiler
           is available for this architecture. Defaults to false.

       -help
           Print a summary of command line options.

       -load=puginfilename
           Causes lli to load the plugin (shared object) named pluginfilename
           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, overriding



CVS                         2010-05-06                          1





LLI(1)                  LLVM Command Guide                 LLI(1)


           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 current
           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 precision.

       -enable-finite-only-fp-math
           Enable optimizations that assumes only finite floating point math.
           That is, there is no NAN or Inf 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
               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.

       -enable-correct-eh-support
           Make the -lowerinvoke pass insert expensive, but correct, EH code.

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



CVS                         2010-05-06                          2





LLI(1)                  LLVM Command Guide                 LLI(1)


       -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.

SEE ALSO
       llc

AUTHOR
       Maintained by the LLVM Team (<http://llvm.org>).






CVS                         2010-05-06                          3


