OBJCOMMENT General Compiler Directive: Specifies a library search path in an object file.
OPEN Statement: Connects an external file to a unit, creates a new file and connects it to a unit, creates a preconnected file, or changes certain properties of a connection.
OPTIONAL Statement and Attribute: Permits dummy arguments to be omitted in a procedure reference.
OPTIMIZE and NOOPTIMIZE General Compiler Directive: Enables or disables optimizations for the program unit.
OPTIONS Directive General Compiler Directive: Affects data alignment and warnings about data alignment. Also controls whether a target attribute is assigned to a section of program declarations.
OPTIONS Statement Statement: Overrides or confirms the compiler options in effect for a program unit.
OR Elemental Intrinsic Function (Generic): Performs a bitwise inclusive OR on its arguments.
ORDERED OpenMP* Fortran Compiler Directive: Specifies a block of code that the threads in a team must execute in the natural order of the loop iterations, or, as a stand-alone directive, it specifies cross-iteration dependences in a doacross loop nest.
OUT_OF_RANGE Elemental Intrinsic Function (Generic): Indicates if a value can be safely converted to a specified type.
PACK Directive General Compiler Directive: Specifies the memory alignment of derived-type items (and record structure items).
PACK Function Transformational Intrinsic Function (Generic): Takes elements from an array and packs them into a rank-one array under the control of a mask.
PACKTIMEQQ Portability Subroutine: Packs time and date values.
PARALLEL and NOPARALLEL Loop Directives General Compiler Directives: PARALLEL facilitates auto-parallelization by assisting the compiler's dependence analysis of the immediately following DO loop. NOPARALLEL prevents this auto-parallelization.
PARALLEL DO OpenMP* Fortran Compiler Directive: Provides an abbreviated way to specify a parallel region containing a single DO directive.
PARALLEL DO SIMD OpenMP* Fortran Compiler Directive: Specifies a PARALLEL construct that contains one DO SIMD construct and no other statement.
PARALLEL LOOP OpenMP* Fortran Compiler Directive: Specifies a shortcut for indicating that a loop or loop nest can execute concurrently across multiple threads. This feature is only available for ifx.
PARALLEL MASKED OpenMP* Fortran Compiler Directive: Creates a PARALLEL construct containing a MASKED construct, with no Fortran statements in the PARALLEL construct which are not also in the MASKED construct. This feature is only available for ifx.
PARALLEL MASKED TASKLOOP OpenMP* Fortran Compiler Directive: Creates a PARALLEL construct containing a MASKED TASKLOOP construct, with no Fortran statements in the PARALLEL construct that are not also in the MASKED TASKLOOP construct. This feature is only available for ifx.
PARALLEL MASKED TASKLOOP SIMD OpenMP* Fortran Compiler Directive: Creates a PARALLEL construct containing a MASKED TASKLOOP SIMD construct, with no Fortran statements in the PARALLEL construct that are not also in the MASKED TASKLOOP SIMD construct. This feature is only available for ifx.
PARALLEL MASTER OpenMP* Fortran Compiler Directive: (Deprecated; see PARALLEL MASKED) Creates a PARALLEL construct containing a MASTER construct, with no Fortran statements in the PARALLEL construct that are not also in the MASTER construct. This feature is only available for ifx.
PARALLEL MASTER TASKLOOP OpenMP* Fortran Compiler Directive: (Deprecated, replaced by PARALLEL MASKED TASKLOOP) Creates a PARALLEL construct containing a MASTER TASKLOOP construct, with no Fortran statements in the PARALLEL construct that are not also in the MASTER TASKLOOP construct. This feature is only available for ifx.
PARALLEL MASTER TASKLOOP SIMD OpenMP* Fortran Compiler Directive: (Deprecated, replaced by PARALLEL MASKED TASKLOOP SIMD) Creates a PARALLEL construct containing a MASTER TASKLOOP SIMD construct, with no Fortran statements in the PARALLEL construct that are not also in the MASTER TASKLOOP SIMD construct. This feature is only available for ifx.
PARALLEL SECTIONS OpenMP* Fortran Compiler Directive: Provides an abbreviated way to specify a parallel region containing a single SECTIONS directive. The semantics are identical to explicitly specifying a PARALLEL directive immediately followed by a SECTIONS directive.
PARALLEL WORKSHARE OpenMP* Fortran Compiler Directive: Provides an abbreviated way to specify a parallel region containing a single WORKSHARE directive.
PARAMETER Statement and Attribute: Defines a named constant.
PARITY Transformational Intrinsic Function (Generic): Reduces an array by using an exclusive OR (.NEQV.) operation.
PAUSE Statement: Temporarily suspends program execution and lets you execute operating system commands during the suspension. The PAUSE statement is a deleted feature in the Fortran Standard. Intel® Fortran fully supports features deleted in the Fortran Standard.
PEEKCHARQQ Run-Time Function: Checks the keystroke buffer for a recent console keystroke and returns .TRUE. if there is a character in the buffer or .FALSE. if there is not.
PERROR Run-Time Subroutine: Sends a message to the standard error stream, preceded by a specified string, for the last detected error.
POINTER - Fortran Statement and Attribute: Specifies that an object or a procedure is a pointer (a dynamic variable). A pointer does not contain data, but points to a scalar or array variable where data is stored. A pointer has no initial storage set aside for it; memory storage is created for the pointer as a program runs.
POINTER - Integer Statement: Establishes pairs of objects and pointers, in which each pointer contains the address of its paired object. This statement is different from the Fortran POINTER statement.
POPCNT Elemental Intrinsic Function (Generic): Returns the number of 1 bits in the integer argument.
POPPAR Elemental Intrinsic Function (Generic): Returns the parity of the integer argument.
PRECISION Inquiry Intrinsic Function (Generic): Returns the decimal precision in the model representing real numbers with the same kind parameter as the argument.
PREFETCH and NOPREFETCH General Compiler Directives: PREFETCH hints to the compiler to prefetch data into closer levels of cache. Prefetching data can minimize the effects of memory latency. NOPREFETCH disables data prefetching. These directives give fine-level control to the programmer to influence the prefetches generated by the compiler.
PRESENT Inquiry Intrinsic Function (Generic): Returns whether or not an optional dummy argument is present, that is, whether it has an associated actual argument.
PRINT Statement: Displays output on the screen. TYPE is a synonym for PRINT. All forms and rules for the PRINT statement also apply to the TYPE statement.
PRIORITY Parallel Directive Clause: Specifies that the generated tasks have the indicated priority for execution.
PRIVATE Clause Parallel Directive Clause: Declares one or more variables to be private to each thread in a team.
PRIVATE Statement Statement and Attribute: Specifies that entities in a module can be accessed only within the module itself.
PROCEDURE Statement: Declares procedure pointers, dummy procedures, and external procedures.
PROCESSOR Clause Parallel Directive Clause: Tells the compiler to create a vector version of the routine for the specified processor. When running on a processor that does not match "cpuid", a scalar version will be invoked multiple times based on vector length.
PRODUCT Transformational Intrinsic Function (Generic): Returns the product of all the elements in an entire array or in a specified dimension of an array.
PROGRAM Statement: Identifies the program unit as a main program and gives it a name.
PROTECTED Statement and Attribute: Specifies limitations on the use of module entities.
PSECT General Compiler Directive: Modifies characteristics of a common block.
PUBLIC Statement and Attribute: Specifies that entities in a module can be accessed from outside the module by specifying a USE statement.
PURE Keyword: Asserts that a user-defined procedure has no side effects.
PUTC Portability Function: Writes a character to Fortran external unit number 6.