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. llc [options] [filename] The llc command compiles LLVM source inputs into assembly language for a specified architecture. The assembly language output can then be passed through a native assembler and linker to generate a native executable. The choice of architecture for the output assembly code is automatically determined from the input file, unless the -march option is used to override the default. If filename is - or omitted, llc reads from standard input. Otherwise, it will from filename. Inputs can be in either the LLVM assembly language format (.ll) or the LLVM bitcode format (.bc). If the -o option is omitted, then llc will send its output to standard output if the input is from standard input. If the -o option specifies -, then the output will also be sent to standard output. If no -o option is specified and an input file other than - is specified, then llc creates the output filename by taking the input filename, removing any existing .bc extension, and adding a .s suffix. Other llc options are as follows: -help NDENT 0.0 NDENT 3.5 Print a summary of command line options. NINDENT NINDENT -O=uint NDENT 0.0 NDENT 3.5 Generate code at different optimization levels. These correspond to the -O0, -O1, -O2, and -O3 optimization levels used by llvm-gcc and clang. NINDENT NINDENT -mtriple=target triple NDENT 0.0 NDENT 3.5 Override the target triple specified in the input file with the specified string. NINDENT NINDENT -march=arch NDENT 0.0 NDENT 3.5 Specify the architecture for which to generate assembly, overriding the target encoded in the input 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. NINDENT NINDENT -mcpu=cpuname NDENT 0.0 NDENT 3.5 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 NINDENT NINDENT -mattr=a1,+a2,-a3,... NDENT 0.0 NDENT 3.5 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 NINDENT NINDENT --disable-fp-elim NDENT 0.0 NDENT 3.5 Disable frame pointer elimination optimization. NINDENT NINDENT --disable-excess-fp-precision NDENT 0.0 NDENT 3.5 Disable optimizations that may produce excess precision for floating point. Note that this option can dramatically slow down code on some systems (e.g. X86). NINDENT NINDENT --enable-no-infs-fp-math NDENT 0.0 NDENT 3.5 Enable optimizations that assume no Inf values. NINDENT NINDENT --enable-no-nans-fp-math NDENT 0.0 NDENT 3.5 Enable optimizations that assume no NAN values. NINDENT NINDENT --enable-unsafe-fp-math NDENT 0.0 NDENT 3.5 Enable optimizations that make unsafe assumptions about IEEE math (e.g. that addition is associative) or may not work for all input ranges. These optimizations allow the code generator to make use of some instructions which would otherwise not be usable (such as fsin on X86). NINDENT NINDENT --enable-correct-eh-support NDENT 0.0 NDENT 3.5 Instruct the lowerinvoke pass to insert code for correct exception handling support. This is expensive and is by default omitted for efficiency. NINDENT NINDENT --stats NDENT 0.0 NDENT 3.5 Print statistics recorded by code-generation passes. NINDENT NINDENT --time-passes NDENT 0.0 NDENT 3.5 Record the amount of time needed for each pass and print a report to standard error. NINDENT NINDENT --load=dso_path NDENT 0.0 NDENT 3.5 Dynamically load dso_path (a path to a dynamically shared object) that implements an LLVM target. This will permit the target name to be used with the -march option so that code can be generated for that target. NINDENT NINDENT --print-machineinstrs NDENT 0.0 NDENT 3.5 Print generated machine code between compilation phases (useful for debugging). NINDENT NINDENT --regalloc=allocator NDENT 0.0 NDENT 3.5 Specify the register allocator to use. The default allocator is local. Valid register allocators are: simple NDENT 0.0 NDENT 3.5 Very simple "always spill" register allocator NINDENT NINDENT local NDENT 0.0 NDENT 3.5 Local register allocator NINDENT NINDENT linearscan NDENT 0.0 NDENT 3.5 Linear scan global register allocator NINDENT NINDENT iterativescan NDENT 0.0 NDENT 3.5 Iterative scan global register allocator NINDENT NINDENT NINDENT NINDENT --spiller=spiller NDENT 0.0 NDENT 3.5 Specify the spiller to use for register allocators that support it. Currently this option is used only by the linear scan register allocator. The default spiller is local. Valid spillers are: simple NDENT 0.0 NDENT 3.5 Simple spiller NINDENT NINDENT local NDENT 0.0 NDENT 3.5 Local spiller NINDENT NINDENT NINDENT NINDENT --x86-asm-syntax=att|intel NDENT 0.0 NDENT 3.5 Specify whether to emit assembly code in AT&T syntax (the default) or intel syntax. NINDENT NINDENT If llc succeeds, it will exit with 0. Otherwise, if an error occurs, it will exit with a non-zero value. lli|lli Maintained by The LLVM Team (http://llvm.org/). 2012, LLVM Project Generated by docutils manpage writer.
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