Compiler Limits

The amount of data storage, the size of arrays, and the total size of executable programs are limited only by the amount of process virtual address space available, as determined by system parameters.

The table below shows the limits to the size and complexity of a single Intel Fortran program unit and to individual statements contained within it:

Language Element	Limit
Actual number of arguments per CALL or function reference	Limited only by memory constraints
Arguments in a function reference in a specification expression	255
Array dimensions	7
Array construction nesting	20
Array elements per dimension	9,223,372,036,854,775,807 = 231-1 on IA-32 systems; 263-1 Itanium-based systems; plus limited by current memory configuration
Constants: character and Hollerith	7198 characters
Constants: characters read in list-directed I/O	2048 characters
Continuation lines	511
Data and I/O implied DO nesting	7
DO and block IF statement nesting (combined)	256
DO loop index variable	9,223,372,036,854,775,807 = 2**63-1
Format group nesting	8
Format statement length	2048 characters
Fortran source line length	fixed form: 72 (or 132 if `-extend_source` is in effect) characters; free form: 7200 characters
INCLUDE file nesting	20 levels
Labels in computed or assigned GOTO list	Limited only by memory constraints
Lexical tokens per statement	20000
Named common blocks	Limited only by memory constraints
Nesting of array constructor implied DOs	7
Nesting of input/output implied DOs	7
Nesting of interface blocks	Limited only by memory constraints
Nesting of DO, IF, or CASE constructs	Limited only by memory constraints
Nesting of parenthesized formats	Limited only by memory constraints
Number of digits in a numeric constant	Limited only by memory constraints
Parentheses nesting in expressions	Limited only by memory constraints
Structure nesting	30
Symbolic name length	63 characters

See the product Release Notes for more information on memory limits for large data objects.