SPEC Accel OpenMP 4.0 Flag Description for the Intel(R) C/C++ Compiler for IA32 and Intel 64 applications and Intel(R) Fortran Compiler for IA32 and Intel 64 applications

Adds the directory for include files to the search path at compile time.

Adds the directory for include files to the search path at compile time.

Adds the library directory search path at link time

Enable the compiler to generate multi-threaded code based on the OpenMP* directives (same as -fopenmp)

Enables OpenMP* offloading compilation for target pragmas. This option only applies to Intel(R) MIC Architecture and Intel(R) Graphics Technology. Enabled by default with -qopenmp. Use -qno-openmp-offload to disable.
Specify kind to specify the default device for target pragmas
host - allow target code to run on host system while still doing the outlining for offload
mic - specify Intel(R) MIC Architecture
gfx - specify Intel(R) Graphics Technology

optimize for maximum speed and enable more aggressive optimizations that may not improve performance on some programs

May generate Intel(R) Advanced Vector Extensions 512 (Intel(R) AVX-512) Foundation instructions, Intel(R) AVX-512 Conflict Detection instructions, Intel(R) AVX-512 Doubleword and Quadword instructions, Intel(R) AVX-512 Byte and Word instructions and Intel(R) AVX-512 Vector Length Extensions for Intel(R) processors, and the instructions enabled with CORE-AVX2.

May generate Intel(R) Advanced Vector Extensions 512 (Intel(R) AVX-512) Foundation instructions, Intel(R) AVX-512 Conflict Detection instructions, as well as the instructions enabled with CORE-AVX2. Optimizes for Intel(R) processors that support Intel(R) AVX-512 instructions.

-qopt-zmm-usage=
Specifies the level of zmm registers usage. You can specify one of the following:
low - Tells the compiler that the compiled program is unlikely to benefit from zmm registers usage. It specifies that the compiler should avoid using zmm registers unless it can prove the gain from their usage.
high - Tells the compiler to generate zmm code without restrictions

-fimf-precision=value[:funclist]
defines the accuracy (precision) for math library functions
value - defined as one of the following values
high - equivalent to max-error = 0.6
medium - equivalent to max-error = 4 (DEFAULT)
low - equivalent to accuracy-bits = 11 (single precision); accuracy-bits = 26 (double precision)
funclist - optional comma separated list of one or more math library functions to which the attribute should be applied

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

Enable levels of prefetch insertion, where 0 disables. n may be 0 through 5 inclusive. Default is 2.

Determine if certain square root optimizations are enabled.

Enable single-file IP optimization within files.

Enable multi-file IP optimization between files.

FPORTABILITY flag

No Fortran main method exists, use C equivalent instead.

Enables the use of nested SIMD statements for OpenMP.

Invoke the Intel C compiler.

Invoke the Intel C++ compiler.

Invoke the Intel Fortran compiler.

Link using FFTW 3.3.6 library for Linux. Description from FFTW:

FFTW lib compiled with -O3 -xCORE-AVX512

FFTW is a C subroutine library for computing the discrete Fourier transform (DFT) in one or more dimensions, of arbitrary input size, and of both real and complex data (as well as of even/odd data, i.e. the discrete cosine/sine transforms or DCT/DST).