Intel-Specific Pragmas

The Intel-specific C++ compiler pragmas described in the Intel-Specific Pragma reference are listed below.

Some pragmas are available for both Intel® and non-Intel microprocessors but they may perform additional optimizations for Intel® microprocessors than they perform for non-Intel microprocessors.

Click on the pragmas for a more detailed description.

Pragma	Description
alloc_section	allocates variable in specified section
distribute_point	instructs the compiler to prefer loop distribution at the location indicated
inline	instructs the compiler that the user prefers that the calls in question be inlined
intel_omp_task	specifies a unit of work, potentially executed by a different thread
intel_omp_taskq	specifies a unit of work, potentially executed by a different thread
ivdep	instructs the compiler to ignore assumed vector dependencies
loop_count	indicates the loop count is likely to be an integer
novector	specifies that the loop should never be vectorized
optimize	enables or disables optimizations for specific functions; provides some degree of compatibility with Microsoft's implementation of optimize pragma
optimization_level	enables control of optimization for a specific function
parallel/noparallel	facilitates auto-parallelization of an immediately following DO loop; using keyword [always] forces the compiler to auto-parallelize; noparallel pragma prevents auto-parallelization
simd	enforces vectorization of innermost loops
unroll/nounroll	instructs the compiler the number of times to unroll/not to unroll a loop
unroll_and_jam/nounroll_and_jam	instructs the compiler to partially unroll higher loops and jam the resulting loops back together. Specifying the nounroll_and_jam pragma prevents unrolling and jamming of loops.
unused	describes variables that are unused (warnings not generated)
vector	indicates to the compiler that the loop should be vectorized according to the arguments: `always/aligned/unaligned/nontemporal/temporal`