man(1)

NAME
Faust - DSP to C/C++, CMajor, Codebox, CSharp, DLang, Interpreter, Java, LLVM IR, Julia, JSFX, Rust and WebAssembly (wast/wasm)

SYNOPSIS
faust [options] file1 [file2 ...]

DESCRIPTION
Faust (Functional Audio Stream) is a functional programming language specifically designed for real-time signal processing and synthesis. Faust targets high-performance signal processing applications and audio plug-ins for a variety of platforms and standards.

OPTIONS

  Input options:
-a <file> wrapper architecture file.

-i --inline-architecture-files inline architecture files.

-A <dir> --architecture-dir <dir> add the directory <dir> to the architecture search path.

-I <dir> --import-dir <dir> add the directory <dir> to the libraries search path.

-L <file> --library <file> link with the LLVM module <file>.

  Output options:
-o <file> the output file.

-e --export-dsp export expanded DSP (with all included libraries).

-uim --user-interface-macros add user interface macro definitions to the output code.

-xml generate an XML description file.

-json generate a JSON description file.

-O <dir> --output-dir <dir> specify the relative directory of the generated output code and of additional generated files (SVG, XML...).

  Code generation options:
-lang <lang> --language select output language, `lang' should be asc, c, cpp (default), cmajor, codebox, csharp, dlang, fir, interp, java, jax, jsfx, julia, llvm, ocpp, rust, sdf3, vhdl or wast/wasm.

-single --single-precision-floats use single precision floats for internal computations (default).

-double --double-precision-floats use double precision floats for internal computations.

-quad --quad-precision-floats use quad precision floats for internal computations.

-fx --fixed-point use fixed-point for internal computations.

-fx-size --fixed-point-size fixed-point number total size in bits (-1 is used to generate a unique fixpoint_t type).

-es 1|0 --enable-semantics 1|0 use enable semantics when 1 (default), and simple multiplication otherwise.

-lcc --local-causality-check check causality also at local level.

-light --light-mode do not generate the entire DSP API.

-clang --clang when compiled with clang/clang++, adds specific #pragma for auto-vectorization.

-nvi --no-virtual when compiled with the C++ backend, does not add the `virtual' keyword.

-fp --full-parentheses always add parentheses around binops.

-cir --check-integer-range check float to integer range conversion.

-exp10 --generate-exp10 pow(10,x) replaced by possibly faster exp10(x).

-os --one-sample generate one sample computation.

-ec --external-control separated `control' and `compute' functions.

-it --inline-table inline rdtable/rwtable code in the main class.

-cm --compute-mix mix in outputs buffers.

-ct --check-table check rtable/rwtable index range and generate safe access code [0/1: 1 by default].

-cn <name> --class-name <name> specify the name of the dsp class to be used instead of mydsp.

-scn <name> --super-class-name <name> specify the name of the super class to be used instead of dsp.

-pn <name> --process-name <name> specify the name of the dsp entry-point instead of process.

-mcd <n> --max-copy-delay <n> use a copy delay up to max delay <n> and a dense delay above (ocpp only) or a ring buffer (default 16 samples).

-mdd <n> --max-dense-delay <n> use a dense delay up to max delay <n> (if enough density) and a ring buffer delay above (ocpp only, default 1024).

-mdy <n> --min-density <n> minimal density (100*number of delays/max delay) to use a dense delays (ocpp only, default 33).

-dlt <n> --delay-line-threshold <n> use a mask-based ring buffer delays up to max delay <n> and a select based ring buffers above (default INT_MAX samples).

-mem --memory-manager allocations done using a custom memory manager.

-mem1 --memory-manager1 allocations done using a custom memory manager, using the iControl/fControl and iZone/fZone model.

-mem2 --memory-manager2 use iControl/fControl, iZone/fZone model and no explicit memory manager.

-mem3 --memory-manager3 use iControl/fControl, iZone/fZone model and no explicit memory manager with access as function parameters.

-ftz <n> --flush-to-zero <n> code added to recursive signals [0:no (default), 1:fabs based, 2:mask based (fastest)].

-rui --range-ui whether to generate code to constraint vslider/hslider/nentry values in [min..max] range.

-fui --freeze-ui whether to freeze vslider/hslider/nentry to a given value (init value by default).

-inj <f> --inject <f> inject source file <f> into architecture file instead of compiling a dsp file.

-scal --scalar generate non-vectorized code (default).

-inpl --in-place generates code working when input and output buffers are the same (scalar mode only).

-vec --vectorize generate easier to vectorize code.

-vs <n> --vec-size <n> size of the vector (default 32 samples).

-lv <n> --loop-variant <n> [0:fastest, fixed vector size and a remaining loop (default), 1:simple, variable vector size, 2:fixed, fixed vector size].

-omp --openmp generate OpenMP pragmas, activates --vectorize option.

-pl --par-loop generate parallel loops in --openmp mode.

-sch --scheduler generate tasks and use a Work Stealing scheduler, activates --vectorize option.

-ocl --opencl generate tasks with OpenCL (experimental).

-cuda --cuda generate tasks with CUDA (experimental).

-dfs --deep-first-scheduling schedule vector loops in deep first order.

-g --group-tasks group single-threaded sequential tasks together when -omp or -sch is used.

-fun --fun-tasks separate tasks code as separated functions (in -vec, -sch, or -omp mode).

-fm <file> --fast-math <file> use optimized versions of mathematical functions implemented in <file>, use `faust/dsp/fastmath.cpp' when file is `def', assume functions are defined in the architecture file when file is `arch'.

-mapp --math-approximation simpler/faster versions of `floor/ceil/fmod/remainder' functions.

-noreprc --no-reprc (Rust only) Don’t force dsp struct layout to follow C ABI.

-ns <name> --namespace <name> generate C++ or D code in a namespace <name>.

-vhdl-trace --vhdl-trace activate trace.

-vhdl-float --vhdl-float uses IEEE-754 format for samples instead of fixed point.

-vhdl-components <file> --vhdl-components <file> path to a file describing custom components for the VHDL backend.

-fpga-mem <n> --fpga-mem <n> FPGA block ram max size, used in -mem1/-mem2 mode.

-fpga-mem-th <n> --fpga-mem-th <n> FPGA array size threshold (in unit of the memory type), used in -mem1/-mem2 mode.

-wi <n> --widening-iterations <n> number of iterations before widening in signal bounding.

-ni <n> --narrowing-iterations <n> number of iterations before stopping narrowing in signal bounding.

-rnt --rust-no-faustdsp-trait (Rust only) Don’t generate FaustDsp trait implementation.

-rnlm --rust-no-libm (Rust only) Don’t generate FFI calls to libm.

  Block diagram options:
-ps --postscript print block-diagram to a postscript file.

-svg --svg print block-diagram to a svg file.

-sd --simplify-diagrams try to further simplify diagrams before drawing.

-drf --draw-route-frame draw route frames instead of simple cables.

-f <n> --fold <n> threshold to activate folding mode during block-diagram generation (default 25 elements).

-fc <n> --fold-complexity <n> complexity threshold to fold an expression in folding mode (default 2).

-mns <n> --max-name-size <n> threshold during block-diagram generation (default 40 char).

-sn --simple-names use simple names (without arguments) during block-diagram generation.

-blur --shadow-blur add a shadow blur to SVG boxes.

-sc --scaled-svg automatic scalable SVG.

  Math doc options:
-mdoc --mathdoc print math documentation of the Faust program in LaTeX format in a -mdoc folder.

-mdlang <l> --mathdoc-lang <l> if translation file exists (<l> = en, fr, ...).

-stripmdoc --strip-mdoc-tags strip mdoc tags when printing Faust -mdoc listings.

  Debug options:
-d --details print compilation details.

-time --compilation-time display compilation phases timing information.

-flist --file-list print file list (including libraries) used to eval process.

-tg --task-graph print the internal task graph in dot format.

-sg --signal-graph print the internal signal graph in dot format.

-rg --retiming-graph print the internal signal graph after retiming in dot format.

-norm --normalized-form print signals in normalized form and exit.

-norm1 --normalized-form1 print signals in normalized form with IDs for shared sub-expressions and exit.

-me --math-exceptions check / for 0 as denominator and remainder, fmod, sqrt, log10, log, acos, asin functions domain.

-sts --strict-select generate strict code for `selectX' even for stateless branches (both are computed).

-wall --warning-all print all warnings.

-t <sec> --timeout <sec> abort compilation after <sec> seconds (default 120).

  Information options:
-h --help print this help message.

-v --version print version information and embedded backends list.

-libdir --libdir print directory containing the Faust libraries.

-includedir --includedir print directory containing the Faust headers.

-archdir --archdir print directory containing the Faust architectures.

-dspdir --dspdir print directory containing the Faust dsp libraries.

-pathslist --pathslist print the architectures and dsp library paths.

  Environment variables:
FAUST_DEBUG = FAUST_LLVM1 print LLVM IR before optimisation.

FAUST_DEBUG = FAUST_LLVM2 print LLVM IR after optimisation.

FAUST_DEBUG = FIR_PRINTER print FIR after generation.

FAUST_DEBUG = FAUST_LLVM_NO_FM deactivate fast-math optimisation in LLVM IR.

FAUST_OPT = FAUST_SIG_NO_NORM deactivate signal normalisation.

  Example:
faust -a jack-gtk.cpp -o myfx.cpp myfx.dsp

SEE ALSO
Grame Faust site at: https://faust.grame.fr

BUGS
Please report bugs to: https://github.com/grame-cncm/faust/issues

AUTHOR
Copyright (C) 2002-2026, GRAME - Centre National de Creation Musicale. All rights reserved.