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.
OUTGTEXT (W*S) Graphics Subroutine: In graphics mode, sends a string of text to the screen, including any trailing blanks.
OUTTEXT (W*S) Graphics Subroutine: In text or graphics mode, sends a string of text to the screen, including any trailing blanks.
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 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.
PASSDIRKEYSQQ (W*S) QuickWin Function: Determines the behavior of direction and page keys in a QuickWin application.
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.
PIE, PIE_W (W*S) Graphics Functions: Draw a pie-shaped wedge in the current graphics color.
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.
POLYGON, POLYGON_W (W*S) Graphics Functions: Draw a polygon using the current graphics color, logical write mode, and line style.
POLYLINEQQ (W*S) Graphics Function: Draws a line between each successive x, y point in a given array.
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.