Intel(R) Fortran Compiler Help ============================== Intel(R) Compiler includes compiler options that optimize for instruction sets that are available in both Intel(R) and non-Intel microprocessors, but may perform additional optimizations for Intel microprocessors than for non-Intel microprocessors. In addition, certain compiler options for Intel(R) Compiler are reserved for Intel microprocessors. For a detailed description of these compiler options, including the instructions they implicate, please refer to "Intel(R) Compiler User and Reference Guides > Compiler Options." usage: ifort [options] file1 [file2 ...] [/link linker_options] where options represents zero or more compiler options fileN is a Fortran source (.f .for .ftn .f90 .fpp .i .i90), assembly (.asm), object (.obj), static library (.lib), or other linkable file linker_options represents zero or more linker options Notes ----- 1. Many FL32 options are supported; a warning is printed for unsupported options. 2. Intel Fortran compiler options may be placed in your ifort.cfg file. Compiler Option List -------------------- Optimization ------------ /O1 optimize for maximum speed, but disable some optimizations which increase code size for a small speed benefit /O2 optimize for maximum speed (DEFAULT) /O3 optimize for maximum speed and enable more aggressive optimizations that may not improve performance on some programs /Ox enable maximum optimizations (same as /O2) /Os enable speed optimizations, but disable some optimizations which increase code size for small speed benefit (overrides /Ot) /Ot enable speed optimizations (overrides /Os) /Od disable optimizations /Oy[-] enable/disable using EBP as a general purpose register (no frame pointer) (i32 only) /fast enable /QxHOST /O3 /Qipo /Qprec-div- options set by /fast cannot be overridden with the exception of /QxHOST, list options separately to change behavior /Oa[-] assume no aliasing in program /Ow[-] assume no aliasing within functions, but assume aliasing across calls Code Generation --------------- /Qx generate specialized code to run exclusively on processors indicated by as described below SSE2 May generate Intel(R) SSE2 and SSE instructions for Intel processors. Optimizes for the Intel NetBurst(R) microarchitecture. SSE3 May generate Intel(R) SSE3, SSE2, and SSE instructions for Intel processors. Optimizes for the enhanced Pentium(R) M processor microarchitecture and Intel NetBurst(R) microarchitecture. SSSE3 May generate Intel(R) SSSE3, SSE3, SSE2, and SSE instructions for Intel processors. Optimizes for the Intel(R) Core(TM) microarchitecture. SSE4.1 May generate Intel(R) SSE4 Vectorizing Compiler and Media Accelerator instructions for Intel processors. May generate Intel(R) SSSE3, SSE3, SSE2, and SSE instructions and it may optimize for Intel(R) 45nm Hi-k next generation Intel Core(TM) microarchitecture. SSE4.2 May generate Intel(R) SSE4 Efficient Accelerated String and Text Processing instructions supported by Intel(R) Core(TM) i7 processors. May generate Intel(R) SSE4 Vectorizing Compiler and Media Accelerator, Intel(R) SSSE3, SSE3, SSE2, and SSE instructions and it may optimize for the Intel(R) Core(TM) processor family. AVX May generate Intel(R) Advanced Vector Extensions (Intel(R) AVX), Intel(R) SSE4.2, SSE4.1, SSSE3, SSE3, SSE2, and SSE instructions for Intel(R) processors. Optimizes for a future Intel processor. CORE-AVX2 May generate Intel(R) Advanced Vector Extensions 2 (Intel(R) AVX2), Intel(R) AVX, SSE4.2, SSE4.1, SSSE3, SSE3, SSE2, and SSE instructions for Intel(R) processors. Optimizes for a future Intel processor. CORE-AVX-I May generate Intel(R) Advanced Vector Extensions (Intel(R) AVX), including instructions in Intel(R) Core 2(TM) processors in process technology smaller than 32nm, Intel(R) SSE4.2, SSE4.1, SSSE3, SSE3, SSE2, and SSE instructions for Intel(R) processors. Optimizes for a future Intel processor. SSSE3_ATOM May generate MOVBE instructions for Intel processors, depending on the setting of option /Qinstruction. May also generate Intel(R) SSSE3, SSE3, SSE2, and SSE instructions for Intel processors. Optimizes for the Intel(R) Atom(TM) processor and Intel(R) Centrino(R) Atom(TM) Processor Technology. /QxHost generate instructions for the highest instruction set and processor available on the compilation host machine /Qax[,,...] generate code specialized for processors specified by while also generating generic IA-32 instructions. includes one or more of the following: SSE2 May generate Intel(R) SSE2 and SSE instructions for Intel processors. SSE3 May generate Intel(R) SSE3, SSE2, and SSE instructions for Intel processors. SSSE3 May generate Intel(R) SSSE3, SSE3, SSE2, and SSE instructions for Intel processors. SSE4.1 May generate Intel(R) SSE4.1, SSSE3, SSE3, SSE2, and SSE instructions for Intel processors. SSE4.2 May generate Intel(R) SSE4.2, SSE4.1, SSSE3, SSE3, SSE2, and SSE instructions for Intel processors. AVX May generate Intel(R) Advanced Vector Extensions (Intel(R) AVX), Intel(R) SSE4.2, SSE4.1, SSSE3, SSE3, SSE2, and SSE instructions for Intel(R) processors. CORE-AVX2 May generate Intel(R) Advanced Vector Extensions 2 (Intel(R) AVX2), Intel(R) AVX, SSE4.2, SSE4.1, SSSE3, SSE3, SSE2, and SSE instructions for Intel(R) processors. CORE-AVX-I May generate Intel(R) Advanced Vector Extensions (Intel(R) AVX), including instructions in Intel(R) Core 2(TM) processors in process technology smaller than 32nm, Intel(R) SSE4.2, SSE4.1, SSSE3, SSE3, SSE2, and SSE instructions for Intel(R) processors. /arch: generate specialized code to optimize for processors indicated by as described below SSE2 May generate Intel(R) SSE2 and SSE instructions SSE3 May generate Intel(R) SSE3, SSE2 and SSE instructions SSSE3 May generate Intel(R) SSSE3, SSE3, SSE2 and SSE instructions SSE4.1 May generate Intel(R) SSE4.1, SSSE3, SSE3, SSE2 and SSE instructions SSE4.2 May generate Intel(R) SSE4.2, SSE4.1, SSSE3, SSE3, SSE2 and SSE instructions AVX May generate Intel(R) AVX, SSE4.2, SSE4.1, SSSE3, SSE3, SSE2 and SSE instructions /Qinstruction: Refine instruction set output for the selected target processor [no]movbe - Do/do not generate MOVBE instructions with SSSE3_ATOM (requires /QxSSSE3_ATOM) Interprocedural Optimization (IPO) ---------------------------------- /Qip[-] enable(DEFAULT)/disable single-file IP optimization within files /Qipo[n] enable multi-file IP optimization between files /Qipo-c generate a multi-file object file (ipo_out.obj) /Qipo-S generate a multi-file assembly file (ipo_out.asm) /Qip-no-inlining disable full and partial inlining /Qip-no-pinlining disable partial inlining /Qipo-separate create one object file for every source file (overrides /Qipo[n]) /Qipo-jobs specify the number of jobs to be executed simultaneously during the IPO link phase Advanced Optimizations ---------------------- /Qunroll[n] set maximum number of times to unroll loops. Omit n to use default heuristics. Use n=0 to disable the loop unroller /Qunroll-aggressive[-] enables more aggressive unrolling heuristics /Qopt-args-in-regs: Determines whether calls to routines are optimized by passing arguments in registers instead of on the stack. keywords: none, seen(DEFAULT) /Qscalar-rep[-] enable(DEFAULT)/disable scalar replacement (requires /O3) /Qpad[-] enable/disable(DEFAULT) changing variable and array memory layout /Qsafe-cray-ptr Cray pointers do not alias with other variables /Qansi-alias[-] enable/disable(DEFAULT) use of ANSI aliasing rules optimizations; user asserts that the program adheres to these rules /Qcomplex-limited-range[-] enable/disable(DEFAULT) the use of the basic algebraic expansions of some complex arithmetic operations. This can allow for some performance improvement in programs which use a lot of complex arithmetic at the loss of some exponent range. /reentrancy: specify whether the threaded, reentrant run-time support should be used Keywords: none (same as /noreentrancy), threaded, async /noreentrancy do not use threaded, reentrant run-time support /heap-arrays[:n] temporary arrays of minimum size n (in kilobytes) are allocated in heap memory rather than on the stack. If n is not specified, all temporary arrays are allocated in heap memory. /heap-arrays- temporary arrays are allocated on the stack (DEFAULT) /Qopt-multi-version-aggressive[-] enables more aggressive multi-versioning to check for pointer aliasing and scalar replacement /Qopt-ra-region-strategy[:] select the method that the register allocator uses to partition each routine into regions routine - one region per routine block - one region per block trace - one region per trace loop - one region per loop default - compiler selects best option /Qvec[-] enables(DEFAULT)/disables vectorization /Qvec-guard-write[-] enables cache/bandwidth optimization for stores under conditionals within vector loops /Qvec-threshold[n] sets a threshold for the vectorization of loops based on the probability of profitable execution of the vectorized loop in parallel /Qopt-malloc-options:{0|1|2|3|4} specify malloc configuration parameters. Specifying a non-zero value will cause alternate configuration parameters to be set for how malloc allocates and frees memory /Qopt-jump-tables: control the generation of jump tables default - let the compiler decide when a jump table, a series of if-then-else constructs or a combination is generated large - generate jump tables up to a certain pre-defined size (64K entries) - generate jump tables up to in size use /Qopt-jump-tables- to lower switch statements as chains of if-then-else constructs /Qopt-block-factor: specify blocking factor for loop blocking /Qopt-streaming-stores: specifies whether streaming stores are generated always - enables generation of streaming stores under the assumption that the application is memory bound auto - compiler decides when streaming stores are used (DEFAULT) never - disables generation of streaming stores /Qmkl[:] link to the Intel(R) Math Kernel Library (Intel(R) MKL) and bring in the associated headers parallel - link using the threaded Intel(R) MKL libraries. This is the default when /Qmkl is specified sequential - link using the non-threaded Intel(R) MKL libraries cluster - link using the Intel(R) MKL Cluster libraries plus the sequential Intel(R) MKL libraries /Qimsl link to the International Mathematics and Statistics Library* (IMSL* library) /Qopt-subscript-in-range[-] assumes no overflows in the intermediate computation of the subscripts /Qcoarray[:shared|distributed] enable/disable(DEFAULT) coarray syntax for data parallel programming. The default is shared-memory; distributed memory is only valid with the Intel(R) Cluster Toolkit /Qcoarray-num-images:n set default number of coarray images /Qopt-matmul[-] replace matrix multiplication with calls to intrinsics and threading libraries for improved performance (DEFAULT at /O3 /Qparallel) /Qsimd[-] enables(DEFAULT)/disables vectorization using SIMD directive /Qguide-opts: tells the compiler to analyze certain code and generate recommendations that may improve optimizations /Qguide-file[:] causes the results of guided auto-parallelization to be output to a file /Qguide-file-append[:] causes the results of guided auto-parallelization to be appended to a file /Qguide[:] lets you set a level (1 - 4) of guidance for auto-vectorization, auto-parallelization, and data transformation (DEFAULT is 4 when the option is specified) /Qguide-data-trans[:] lets you set a level (1 - 4) of guidance for data transformation (DEFAULT is 4 when the option is specified) /Qguide-par[:] lets you set a level (1 - 4) of guidance for auto-parallelization (DEFAULT is 4 when the option is specified) /Qguide-vec[:] lets you set a level (1 - 4) of guidance for auto-vectorization (DEFAULT is 4 when the option is specified) /Qopt-mem-layout-trans[:] controls the level of memory layout transformations performed by the compiler 0 - disable memory layout transformations (same as /Qopt-mem-layout-trans-) 1 - enable basic memory layout transformations 2 - enable more memory layout transformations (DEFAULT when the option is specified) 3 - enable aggressive memory layout transformations Profile Guided Optimization (PGO) --------------------------------- /Qprof-dir specify directory for profiling output files (*.dyn and *.dpi) /Qprof-src-root specify project root directory for application source files to enable relative path resolution during profile feedback on sources below that directory /Qprof-src-root-cwd specify the current directory as the project root directory for application source files to enable relative path resolution during profile feedback on sources below that directory /Qprof-src-dir[-] specify whether directory names of sources should be considered when looking up profile records within the .dpi file /Qprof-file specify file name for profiling summary file /Qprof-data-order[-] enable/disable(DEFAULT) static data ordering with profiling /Qprof-func-order[-] enable/disable(DEFAULT) function ordering with profiling /Qprof-gen[:keyword] instrument program for profiling. Optional keyword may be srcpos or globdata /Qprof-gen- disable profiling instrumentation /Qprof-use[:] enable use of profiling information during optimization weighted - invokes profmerge with -weighted option to scale data based on run durations [no]merge - enable(default)/disable the invocation of the profmerge tool /Qprof-use- disable use of profiling information during optimization /Qcov-gen instrument program for profiling /Qcov-dir specify directory for profiling output files (*.dyn and *.dpi) /Qcov-file specify file name for profiling summary file /Qopt-prefetch[:n] enable levels of prefetch insertion, where 0 disables. n may be 0 through 4 inclusive. Default is 2. /Qopt-prefetch- disable(DEFAULT) prefetch insertion. Equivalent to /Qopt-prefetch:0 /Qinstrument-functions[-] determine whether function entry and exit points are instrumented /Qprof-hotness-threshold: set the hotness threshold for function grouping and function ordering val indicates percentage of functions to be placed in hot region. This option requires /Qprof-use and /Qprof-func-order /Qprof-value-profiling:[,,...] limit value profiling none - inhibit all types of value profiling nodivide - inhibit value profiling of non-compile time constants used in division or remainder operations noindcall - inhibit value profiling of function addresses at indirect call sites /Qprofile-functions enable instrumentation in generated code for collecting function execution time profiles /Qprofile-loops: enable instrumentation in generated code for collecting loop execution time profiles inner - instrument inner loops outer - instrument outer loops all - instrument all loops /Qprofile-loops-report: Control the level of instrumentation inserted for reporting loop execution profiles 1 - report loop times 2 - report loop times and iteration counts Optimization Reports -------------------- /Qvec-report[n] control amount of vectorizer diagnostic information n=0 no diagnostic information n=1 indicate vectorized loops (DEFAULT when enabled) n=2 indicate vectorized/non-vectorized loops n=3 indicate vectorized/non-vectorized loops and prohibiting data dependence information n=4 indicate non-vectorized loops n=5 indicate non-vectorized loops and prohibiting data dependence information /Qopt-report[:n] generate an optimization report to stderr 0 disable optimization report output 1 minimum report output 2 medium output (DEFAULT when enabled) 3 maximum report output /Qopt-report-file: specify the filename for the generated report /Qopt-report-phase: specify the phase that reports are generated against /Qopt-report-routine: reports on routines containing the given name /Qopt-report-help display the optimization phases available for reporting /Qtcheck[:mode] enable analysis of threaded applications (requires Intel(R) Thread Checker; cannot be used with compiler alone) tci - instruments a program to perform a thread-count-independent analysis tcd - instruments a program to perform a thread-count-dependent analysis (DEFAULT when mode is not used) api - instruments a program at the api-imports level /Qtcollect[:] inserts instrumentation probes calling the Intel(R) Trace Collector API. The library .lib is linked in the default being VT.lib (requires Intel(R) Trace Collector) /Qtcollect-filter:file Enable or disable the instrumentation of specified functions. (requires Intel(R) Trace Collector) OpenMP* and Parallel Processing ------------------------------ /Qopenmp enable the compiler to generate multi-threaded code based on the OpenMP* directives (same as /openmp) /Qopenmp-stubs enables the user to compile OpenMP programs in sequential mode. The OpenMP directives are ignored and a stub OpenMP library is linked (sequential) /Qopenmp-report{0|1|2} control the OpenMP parallelizer diagnostic level /Qopenmp-lib: choose which OpenMP library version to link with compat - use the Microsoft compatible OpenMP run-time libraries (DEFAULT) /Qopenmp-threadprivate: choose which threadprivate implementation to use compat - use the Microsoft compatible thread local storage legacy - use the Intel compatible implementation (DEFAULT) /Qparallel enable the auto-parallelizer to generate multi-threaded code for loops that can be safely executed in parallel /Qpar-report{0|1|2|3} control the auto-parallelizer diagnostic level /Qpar-threshold[n] set threshold for the auto-parallelization of loops where n is an integer from 0 to 100 /Qpar-runtime-control[n] Control parallelizer to generate runtime check code for effective automatic parallelization. n=0 no runtime check based auto-parallelization n=1 generate runtime check code under conservative mode (DEFAULT when enabled) n=2 generate runtime check code under heuristic mode n=3 generate runtime check code under aggressive mode /Qpar-schedule-static[:n] Specifies a scheduling algorithm for DO loop iteration. Divides iterations into contiguous pieces. Size n if specified, equal sized pieces if not. /Qpar-schedule-static_balanced[:n] Divides iterations into even-sized chunks. Size n if specified, equal sized pieces if not. /Qpar-schedule-static-steal[:n] Divides iterations into even-sized chunks, but allows threads to steal parts of chunks from neighboring threads /Qpar-schedule-dynamic[:n] Specifies a scheduling algorithm for DO loop iteration. Assigns iterations to threads in chunks dynamically. Chunk size is n iterations if specified, otherwise 1. /Qpar-schedule-guided[:n] Specifies a scheduling algorithm for DO loop iteration. Indicates a minimum number of iterations. If specified, n is the minimum number, otherwise 1. /Qpar-schedule-guided-analytical[:n] Divides iterations by using exponential distribution or dynamic distributions. /Qpar-schedule-runtime Specifies a scheduling algorithm for DO loop iteration. Defers the scheduling decision until runtime. /Qpar-schedule-auto Lets the compiler or run-time system determine the scheduling algorithm. /Qpar-adjust-stack perform fiber-based main thread stack adjustment /Qpar-affinity=[,...][,][,] tune application performance by setting different thread affinity /Qpar-num-threads= tune application performance by setting different number of threads /Qparallel-source-info[:n] enable(DEFAULT)/disable the emission of source location information for parallel code generation with OpenMP and auto-parallelization 0 - disable (same as /Qparallel-source-info-) 1 - emit routine name and line information (DEFAULT) 2 - emit path, file, routine name and line information Floating Point -------------- /fp: enable floating point model variation except[-] - enable/disable floating point semantics fast[=1|2] - enables more aggressive floating point optimizations precise - allows value-safe optimizations source - enables intermediates in source precision strict - enables /fp:precise /fp:except, disables contractions and enables pragma stdc fenv_access /Qfp-speculation: enable floating point speculations with the following conditions: fast - speculate floating point operations (DEFAULT) safe - speculate only when safe strict - same as off off - disables speculation of floating-point operations /Qpc32 set internal FPU precision to 24 bit significand /Qprec improve floating-point precision (speed impact less than /Op) /Qprec-sqrt[-] determine if certain square root optimizations are enabled /Qprec-div[-] improve precision of FP divides (some speed impact) /Qfast-transcendentals[-] generate a faster version of the transcendental functions /Qfp-port[-] round fp results at assignments and casts (some speed impact) /Qfp-stack-check enable fp stack checking after every function/procedure call /Qrcd rounding mode to enable fast float-to-int conversions /rounding-mode:chopped set internal FPU rounding control to truncate /Qftz[-] enable/disable flush denormal results to zero /fpe:{0|1|3} specifies program-wide behavior on floating point exceptions /fpe-all:{0|1|3} specifies floating point exception behavior on all functions and subroutines. Also sets /assume:ieee_fpe_flags /[no]fltconsistency specify that improved floating-point consistency should be used /Qfma[-] enable/disable the combining of floating point multiplies and add/subtract operations /[no]recursive compile all procedures for possible recursive execution Inlining -------- /Ob control inline expansion: n=0 disable inlining (same as /inline:none) n=1 inline functions declared with ATTRIBUTES INLINE or FORCEINLINE n=2 inline any function, at the compiler's discretion /Qinline-min-size: set size limit for inlining small routines /Qinline-min-size- no size limit for inlining small routines /Qinline-max-size: set size limit for inlining large routines /Qinline-max-size- no size limit for inlining large routines /Qinline-max-total-size: maximum increase in size for inline function expansion /Qinline-max-total-size- no size limit for inline function expansion /Qinline-max-per-routine: maximum number of inline instances in any function /Qinline-max-per-routine- no maximum number of inline instances in any function /Qinline-max-per-compile: maximum number of inline instances in the current compilation /Qinline-max-per-compile- no maximum number of inline instances in the current compilation /Qinline-factor: set inlining upper limits by n percentage /Qinline-factor- do not set set inlining upper limits /Qinline-forceinline treat inline routines as forceinline /Qinline-dllimport allow(DEFAULT)/disallow functions declared DEC$ ATTRIBUTES DLLIMPORT to be inlined /Qinline-calloc directs the compiler to inline calloc() calls as malloc()/memset() /inline[:keyword] Specifies the level of inline function expansion keywords: all (same as /Ob2 /Ot), size (same as /Ob2 /Os) speed (same as /Ob2 /Ot), none or manual (same as /Ob0) Output, Debug, PCH ------------------ /c compile to object (.obj) only, do not link /nolink, /compile-only same as /c /S compile to assembly (.asm) only, do not link /FAs produce assembly file with optional source annotations /FAc produce assembly file with optional code annotations /FA produce assembly file /Fa[file] name assembly file (or directory for multiple files; i.e. /FaMYDIR\) /Fo[file] name object file (or directory for multiple files; i.e. /FoMYDIR\) /Fe[file] name executable file or directory /object: specify the name of the object file, or the directory to which object file(s) should be written. (e.g. /object:MYOBJ or /object:MYDIR\) /exe: specifies the name to be used for the built program (.exe) or dynamic-link (.dll) library /map: specify that a link map file should be generated /list: specify that a listing file should be generated /list-line-len:# overrides the default line length (80) in a listing file /list-page-len:# overrides the default page length (66) in a listing file /show: controls the contents of the listing file keywords: all, none, [no]include, [no]map, [no]options /Zi, /ZI, /Z7 produce symbolic debug information in object file (implies /Od when another optimization option is not explicitly set) /debug[:keyword] enable debug information and control output of enhanced debug information keywords: all, full, minimal, none, [no]inline-debug-info parallel /nodebug do not enable debug information /debug-parameters[:keyword] control output of debug information for PARAMETERS keywords: all, used, none (same as /nodebug-parameters) /nodebug-parameters do not output debug information for PARAMETERS /Qd-lines, /[no]d-lines compile debug statements (indicated by D in column 1) /pdbfile[:filename] specify that debug related information should be generated to a program database file /nopdbfile do not generate debug related information to a program database file /Qtrapuv trap uninitialized variables /RTCu report use of variable that was not initialized /Qmap-opts enable option mapping tool Preprocessor ------------ /D[{=|#}] define macro /define:symbol[=] same as /D /nodefines specifies that any /D macros go to the preprocessor only, and not to the compiler /U remove predefined macro /undefine: remove predefined macro (same as /U) /allow:nofpp-comments If a Fortran end-of-line comment is seen within a #define, treat it as part of the definition. Default is allow:fpp-comments /E preprocess to stdout /EP preprocess to stdout, omitting #line directives /EP /P preprocess to file, omitting #line directives /P preprocess to file /preprocess-only same as /P /[no]keep keep/remove preprocessed file generated by preprocessor as input to compiler stage. Not affected by /Qsave-temps. Default is /nokeep /fpp[n], /[no]fpp run Fortran preprocessor on source files prior to compilation n=0 disable running the preprocessor, equivalent to nofpp n=1,2,3 run preprocessor /module:path specify path where mod files should be placed and first location to look for mod files /u remove all predefined macros /I add directory to include file search path /[no]include: same as /I /X remove standard directories from include file search path /[no]gen-dep[:filename] generate dependency information. If no filename is specified, output to stdout /gen-depformat:keyword generate dependency information in the specified format. One of: make, nmake Component Control ----------------- /Qoption,, pass options to tool specified by /Qlocation,, set as the location of tool specified by Language -------- /[no]altparam specify if alternate form of parameter constant declarations (without parenthesis) is recognized. Default is to recognize /assume: specify assumptions made by the optimizer and code generator keywords: none, [no]byterecl, [no]buffered_io, [no]bscc (nobscc same as /nbs), [no]cc_omp, [no]minus0, [no]dummy_aliases (same as /Qcommon-args), [no]ieee_fpe_flags, [no]fpe_summary, [no]old_boz, [no]old_logical_ldio, [no]old_ldout_format, [no]old_maxminloc, [no]old_unit_star, [no]old_xor, [no]protect_constants, [no]protect_parens, [no]realloc_lhs, [no]2underscore, [no]underscore (same as /us), [no]std_mod_proc_name, [no]source_include, [no]split_common,[no]writeable_strings /ccdefault: specify default carriage control for units 6 and * keywords: default, fortran, list or none /[no]check: check run-time conditions. Default is /nocheck keywords: all (same as /4Yb, /C), none (same as /nocheck, /4Nb), [no]arg_temp_created, [no]bounds (same as /CB), [no]format, [no]output_conversion, [no]pointer (same as /CA), [no]uninit (same as /CU) /Qcommon-args assume "by reference" subprogram arguments may alias one another. Same as /assume:dummy_aliases /[no]extend-source[:] specify rightmost column for fixed form sources keywords: 72 (same as /noextend-source and /4L72), 80 (same as /4L80), 132 (same as /4L132. Default if you specify /extend-source without a keyword.) /fixed specify source files are in fixed format. Same as /FI and /4Nf /nofixed indicates free format /free specify source files are in free format. Same as /FR and /4Yf /nofree indicates fixed format /names: specify how source code identifiers and external names are interpreted. keywords: as_is, lowercase, uppercase /[no]pad-source, /Qpad-source[-] make compiler acknowledge blanks at the end of a line /stand[:] specifies level of conformance with ANSI standard to check for. If keyword is not specified, level of conformance is f03 keywords: f90 (same as /4Ys), f95, f03, none (same as /nostand) /standard-semantics sets assume keywords to conform to the semantics of the f03 standard. May result in performance loss. assume keywords set by /standard-semantics: byterecl, fpe_summary, minus0, noold_maxminloc, noold_unit_star, noold_xor, protect_parens, realloc_lhs, std_mod_proc_name, noold_ldout_format /syntax-only, /Zs perform syntax and semantic checking only (no object file produced) Compiler Diagnostics -------------------- /w disable all warnings /W disable warnings (n = 0) or show warnings (n = 1 DEFAULT, same as /warn:general) /warn: specifies the level of warning messages issued keywords: all, none (same as /nowarn) [no]alignments, [no]declarations, [no]errors, [no]general, [no]ignore_loc, [no]interfaces, [no]stderrors, [no]truncated_source, [no]uncalled, [no]unused, [no]usage /nowarn suppress all warning messages /WB turn a compile-time bounds check into a warning /[no]traceback specify whether the compiler generates PC correlation data used to display a symbolic traceback rather than a hexadecimal traceback at runtime failure /[no]gen-interfaces [[no]source] generate interface blocks for all routines in the file. Can be checked using -warn interfaces nosource indicates temporary source files should not be saved /error-limit: specify the maximum number of error-level or fatal-level compiler errors allowed /noerror-limit set no maximum number on error-level or fatal-level error messages /Qdiag-enable:[,,...] enable the specified diagnostics or diagnostic groups /Qdiag-disable:[,,...] disable the specified diagnostics or diagnostic groups where may be individual diagnostic numbers or group names. where group names include: sc[n] - perform source code analysis: n=1 for critical errors, n=2 for all errors and n=3 for all errors and warnings sc-include - perform source code analysis on include files sc-parallel[n] - perform analysis of parallelization in source code: n=1 for critical errors, n=2 for errors, n=3 for all errors and warnings warn - diagnostic messages that have "warning" severity level. error - diagnostic messages that have "error" severity level. remark - diagnostic messages that are remarks or comments. vec - diagnostic messages issued by the vectorizer. par - diagnostic messages issued by the auto-parallelizer openmp - diagnostic messages issued by the OpenMP* parallelizer. cpu-dispatch Specifies the CPU dispatch remarks. /Qdiag-error:[,,...] output the specified diagnostics or diagnostic groups as errors /Qdiag-warning:[,,...] output the specified diagnostics or diagnostic groups as warnings /Qdiag-remark:[,,...] output the the specified diagnostics or diagnostic groups as remarks /Qdiag-dump display the currently enabled diagnostic messages to stdout or to a specified diagnostic output file. /Qdiag-sc-dir: directory where diagnostics from Static security analysis are created, rather than current working directory. /Qdiag-file[:] where diagnostics are emitted to. Not specifying this causes messages to be output to stderr /Qdiag-file-append[:] where diagnostics are emitted to. When already exists, output is appended to the file /Qdiag-id-numbers[-] enable(DEFAULT)/disable the diagnostic specifiers to be output in numeric form /Qdiag-error-limit: specify the maximum number of errors emitted Miscellaneous ------------- /[no]logo display compiler version information. /nologo disables the output /Qsox[:[,keyword]] enable saving of compiler options, version and additional information in the executable. Use /Qsox- to disable(DEFAULT) profile - include profiling data inline - include inlining information /bintext: place the string specified into the object file and executable /Qsave-temps store the intermediate files in current directory and name them based on the source file. Only saves files that are generated by default /what display detailed compiler version information /watch: tells the driver to output processing information keywords: all, none (same as /nowatch), [no]source, [no]cmd /nowatch suppress processing information output (DEFAULT) /Tf compile file as Fortran source /extfor: specify extension of file to be recognized as a Fortran file /extfpp: specify extension of file to be recognized as a preprocessor file /libdir[:keyword] control the library names that should be emitted into the object file keywords: all, none (same as /nolibdir), [no]automatic, [no]user /nolibdir no library names should be emitted into the object file /MP[] create multiple processes that can be used to compile large numbers of source files at the same time /bigobj generate objects with increased address capacity Data ---- /4I{2|4|8} set default KIND of integer and logical variables to 2, 4, or 8 /integer-size: specifies the default size of integer and logical variables size: 16, 32, 64 /4R{8|16} set default size of real to 8 or 16 bytes /real-size: specify the size of REAL and COMPLEX declarations, constants, functions, and intrinsics size: 32, 64, 128 /Qautodouble same as /real-size:64 or /4R8 /double-size: defines the size of DOUBLE PRECISION and DOUBLE COMPLEX declarations, constants, functions, and intrinsics size: 64, 128 /[no]fpconstant extends the precision of single precision constants assigned to double precision variables to double precision /[no]intconstant use Fortran 77 semantics, rather than Fortran 90/95, to determine kind of integer constants /auto make all local variables AUTOMATIC /Qauto-scalar make scalar local variables AUTOMATIC (DEFAULT) /Qsave save all variables (static allocation) (same as /noauto, opposite of /auto) /Qzero[-] enable/disable(DEFAULT) implicit initialization to zero of local scalar variables of intrinsic type INTEGER, REAL, COMPLEX, or LOGICAL that are saved and not initialized /Qdyncom make given common blocks dynamically-allocated /Zp[n] specify alignment constraint for structures (n=1,2,4,8,16 /Zp16 DEFAULT) /[no]align analyze and reorder memory layout for variables and arrays /align: specify how data items are aligned keywords: all (same as /align), none (same as /noalign), [no]commons, [no]dcommons, [no]qcommons, rec1byte, rec2byte, rec4byte, rec8byte, rec16byte, [no]records, [no]sequence /GS enable overflow security checks. /GS- disables (DEFAULT) /Qpatchable-addresses generate code such that references to statically assigned addresses can be patched with arbitrary 64-bit addresses. /Qfnalign[-] align the start of functions to an optimal machine-dependent value. When disabled (DEFAULT) align on a 2-byte boundary /Qfnalign:[2|16] align the start of functions on a 2 (DEFAULT) or 16 byte boundary /Qglobal-hoist[-] enable(DEFAULT)/disable external globals are load safe /Qkeep-static-consts[-] enable/disable(DEFAULT) emission of static const variables even when not referenced /Qnobss-init disable placement of zero-initialized variables in BSS (use DATA) /Qzero-initialized-in-bss[-] put explicitly zero initialized variables into the DATA section instead of the BSS section /convert: specify the format of unformatted files containing numeric data keywords: big_endian, cray, ibm, little_endian, native, vaxd, vaxg /Qimf-absolute-error:value[:funclist] define the maximum allowable absolute error for math library function results /Qimf-accuracy-bits:bits[:funclist] define the relative error, measured by the number of correct bits, for math library function results /Qimf-arch-consistency:value[:funclist] ensures that the math library functions produce consistent results across different implementations of the same architecture /Qimf-max-error:ulps[:funclist] defines the maximum allowable relative error, measured in ulps, for math library function results /Qimf-precision:value[:funclist] defines the accuracy (precision) for math library functions Compatibility ------------- /fpscomp[:] specify the level of compatibility to adhere to with Fortran PowerStation keywords: all, none (same as /nofpscomp), [no]filesfromcmd, [no]general, [no]ioformat, [no]ldio_spacing, [no]libs, [no]logicals /nofpscomp no specific level of compatibility with Fortran PowerStation /f66 allow extensions that enhance FORTRAN-66 compatibility /f77rtl specify that the Fortran 77 specific run-time support should be used /nof77rtl disables /vms enable VMS I/O statement extensions /Qvc enable compatibility with a specific Microsoft Visual C++ version 8 - Visual Studio 2005 compatibility 9 - Visual Studio 2008 compatibility 10 - Visual Studio 2010 compatibility Linking/Linker -------------- /link specify that all options following '/link' are for the linker /extlnk: specify extension of file to be passed directly to linker /F set the stack reserve amount specified to the linker /dbglibs use the debug version of runtime libraries, when appropriate /libs: specifies which type of run-time library to link to. keywords: static, dll, qwin, qwins /LD[d] produce a DLL instead of an EXE ('d' = debug version) /dll same as /LD /MD[d] use dynamically-loaded, multithread C runtime /MDs[d] use dynamically-loaded, singlethread Fortran runtime, and multithread C runtime /MT[d] use statically-linked, multithread C runtime (DEFAULT with Microsoft Visual Studio 2005 and later) /ML[d] use statically-linked, single thread C runtime (only valid in Microsoft Visual Studio 2003 environment) /MG, /winapp use Windows API runtime libraries /Zl omit library names from object file /threads specify that multi-threaded libraries should be linked against /nothreads disables multi-threaded libraries Deprecated Options ------------------ /Qinline-debug-info use /debug:inline-debug-info /Gf use /GF /ML[d] upgrade to /MT[d] /Quse-asm No replacement /Qprof-genx use /Qprof-gen:srcpos /Qdiag-enable:sv[] use /Qdiag-enable:sc[] /Qdiag-enable:sv-include use /Qdiag-enable:sc-include /Qdiag-sv use /Qdiag-enable:sc[] /Qdiag-sv-error use /Qdiag-disable:warning /Qdiag-sv-include use /Qdiag-enable:sc-include /Qdiag-sv-level No replacement /Qdiag-sv-sup use /Qdiag-disable:[,,...] /Qopenmp-link No replacement /Qopenmp-profile No replacement /Qtprofile No replacement /arch:SSE use /arch:IA32 /QxK upgrade to /arch:SSE2 /QaxK upgrade to /arch:SSE2 /QxW use /arch:SSE2 /QaxW use /arch:SSE2 /QxN use /QxSSE2 /QaxN use /QaxSSE2 /QxP use /QxSSE3 /QaxP use /QaxSSE3 /QxT use /QxSSSE3 /QaxT use /QaxSSSE3 /QxS use /QxSSE4.1 /QaxS use /QaxSSE4.1 /QxH use /QxSSE4.2 /QaxH use /QaxSSE4.2 /QxO use /arch:SSE3 /Qvc7.1 No replacement /QIfist use /Qrcd /QxSSE3_ATOM use /QxSSSE3_ATOM /Op use /fltconsistency /debug:partial No replacement /tune: use /Qx /architecture: use /arch: /1, /Qonetrip use /f66 /Fm use /map /Qcpp, /Qfpp use /fpp /Qdps use /altparam /Qextend-source use /extend-source /Qlowercase use /names:lowercase /Quppercase use /names:uppercase /Qvms use /vms /asmattr:keyword use /FA[c|s|cs] /noasmattr,/asmattr:none use /FA /asmfile use /Fa /automatic use /auto /cm use /warn:nousage /optimize:0 use /Od /optimize:1,2 use /O1 /optimize:3,4 use /O2 /optimize:5 use /O3 /source use /Tf /unix No replacement /us use /assume:underscore /unroll use /Qunroll /w90, /w95 No replacement /Zd use /debug:minimal /help, /? [category] print full or category help message Valid categories include advanced - Advanced Optimizations codegen - Code Generation compatibility - Compatibility component - Component Control data - Data deprecated - Deprecated Options diagnostics - Compiler Diagnostics float - Floating Point help - Help inline - Inlining ipo - Interprocedural Optimization (IPO) language - Language link - Linking/Linker misc - Miscellaneous opt - Optimization output - Output pgo - Profile Guided Optimization (PGO) preproc - Preprocessor reports - Optimization Reports openmp - OpenMP and Parallel Processing Copyright (C) 1985-2011, Intel Corporation. All rights reserved. * Other names and brands may be claimed as the property of others.