Intel® Fortran Compiler 17.0 Developer Guide and Reference
This topic only applies when targeting Intel® Many Integrated Core Architecture (Intel® MIC Architecture).
The Intel® Fortran Compiler provides several elements to enable programming for and building binaries to run on the Intel® Many Integrated Core Architecture (Intel® MIC Architecture), including:
language extensions
compiler options
environment variables
OpenMP* considerations
Code that is defined for offloading runs on an Intel® Xeon® processor-based host, running Linux* or Windows*, and on targets supporting Intel® MIC Architecture.
You can write parallel programs that offload sections of code to run on the Intel® MIC Architecture, or alternatively, that run natively on Intel® MIC Architecture. Compiling a source file that contains extensions to facilitate programming for the Intel MIC Architecture creates what is called a fat binary which contains both the host binary and an offload binary. Fat binaries can be objects, archives, or executables depending on the options used at compilation. Refer to the documentation on the Offload Extract Tool (offload_extract) for information on how to extract the offload binary from the fat binary.
The compiler provides the following language extensions to facilitate programming for Intel® MIC Architecture:
Name |
Description |
|---|---|
OFFLOAD directive OFFLOAD_ATTRIBUTE directive OFFLOAD_TRANSFER directive OFFLOAD_WAIT directive OFFLOAD BEGIN and END OFFLOAD directive PREFETCH/NOPREFETCH directive |
Directives to control the data transfer between the CPU and the coprocessor. |
__INTEL_OFFLOAD macro __TARGET_ARCH_MIC macro __AVX512F__ macro __AVX512CD__ macro __AVX512ER__ macro __AVX512PF__ macro |
Predefined preprocessor symbols for use with the Intel® Xeon Phi™ product family x200 (formerly code name Knights Landing). |
__INTEL_OFFLOAD macro __TARGET_ARCH_MIC macro __KNC__ macro __MIC__ macro |
Predefined preprocessor symbols for use with the Intel® Xeon Phi™ coprocessor x100 product family (formerly code name Knights Corner). |
ATTRIBUTES OFFLOAD directive |
A directive for placing variables and functions on the coprocessor. |
APIs in mic_lib.f90 |
A set of functions for:
|
The compiler provides the following compiler options and environment variables that you can use when building a binary for Intel® MIC Architecture:
Compiler Option |
Description |
|---|---|
The negative form of qoffload, Qoffload |
Ignores language constructs for offloading. |
Qmic (Windows*) mmic (Linux*) |
Builds an application that runs natively on Intel® MIC Architecture. |
Qoffload-arch, qoffload-arch |
Specifies the target architecture to use when offloading code. |
Qoffload-attribute-target, qoffload-attribute-target |
Flags every global routine and global data object in the source file with the offload attribute target(mic). |
Qoffload-option, qoffload-option |
Specifies options to be used for the specified target and tool. |
Qopt-report-phase:offload, qopt-report-phase=offload |
Specifies the offload optimizer phase to use when optimization reports are generated. |
Qopt-assume-safe-padding, qopt-assume-safe-padding |
Determines whether the compiler assumes that variables and dynamically allocated memory are padded past the end of the object. |
Qopt-streaming-cache-evict, qopt-streaming-cache-evict |
Specifies the cache eviction level to be used by the compiler for streaming loads and stores. |
Qopt-threads-per-core, qopt-threads-per-core |
Informs the compiler about the number of hardware threads per core that will be used for an application. |
Qopt-gather-scatter-unroll, qopt-gather-scatter-unroll |
Specifies an alternative loop unroll sequence for gather and scatter loops. |
The following environment variables are only a few of the available environment variables for Intel® MIC Architecture:
Environment Variable |
Description |
|---|---|
MIC_STACKSIZE |
Sets the stack size on the coprocessor. |
MIC_ENV_PREFIX |
Controls environment variables passed to the coprocessor. |
MIC_PROXY_IO |
Controls the I/O proxy of stderr and stdout. |