Intel® Fortran Compiler Classic and Intel® Fortran Compiler Developer Guide and Reference

ID 767251
Date 9/08/2022
Public

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%VAL

Built-in Function: Changes the form of an actual argument. Passes the argument as an immediate value.

%VAL (a)

a

(Input) An expression, record name, procedure name, array, character array section, or array element.

Description

The argument is passed as follows:

  • On IA-32 architecture, as a 32-bit immediate value. If the argument is integer (or logical) and shorter than 32 bits, it is sign-extended to a 32-bit value. For complex data types, %VAL passes two 32-bit arguments.

  • On Intel® 64 architecture, as a 64-bit immediate value. If the argument is integer (or logical) and shorter than 64 bits, it is sign-extended to a 64-bit value. For complex data types, %VAL passes two 64-bit arguments.

You must specify %VAL in the actual argument list of a CALL statement or function reference. You cannot use it in any other context.

The following tables list the Intel® Fortran defaults for argument passing, and the allowed uses of %VAL:

Expressions

Actual Argument Data Type

Default

%VAL

Logical

REF

Yes1

Integer

REF

Yes1

REAL(4)

REF

Yes

REAL(8)

REF

No

REAL(16)

REF

No

COMPLEX(4)

REF

Yes

COMPLEX(8)

REF

Yes

COMPLEX(16)

REF

No

Character

See table note 2

No

Hollerith

REF

No

Aggregate3

REF

No

Derived

REF

No

Array Name

Actual Argument Data Type

Default

%VAL

Numeric

REF

No

Character

See table note 2

No

Aggregate3

REF

No

Derived

REF

No

Procedure Name

Actual Argument Data Type

Default

%VAL

Numeric

REF

No

Character

See table note 2

No

1 If a logical or integer value occupies less than 64 bits of storage on Intel® 64 architecture, or 32 bits of storage on IA-32 architecture, it is converted to the correct size by sign extension. Use the ZEXT intrinsic function if zero extension is desired.

2 A character argument is passed by address and hidden length.

3 In Intel® Fortran record structures

The %VAL and %REF functions override related !DIR$ ATTRIBUTE settings.

Example
  CALL SUB(2, %VAL(2))

Constant 2 is passed by reference. The second constant 2 is passed by immediate value.

See Also