Literals

In this section:

• Introduction
• The execution environment
• The CODE/EDOC facility
• Mixing of Intel 32-bit Assembler and Fortran
• Labels
• Referencing Fortran variables
• Literals
• Halfword and byte forms of instructions
• Using the coprocessor
• Instruction prefixes
• Other assembler facilities
• Other machine-level facilities
• Error messages
• 64-bit assembler

An instruction operand may be a constant (literal). In this case the constant must be preceded by an '='. Floating point instructions may have literal arguments, which are placed in memory and addressed, since there is no immediate form of these instructions.

Literals may contain any constant expression (which will be evaluated using the standard Fortran rules) and may be of any type. For example:

FLD      =5.0
DFADD    =5.0D0                  ;Note REAL*8
                                 ; constant needed
MOV      EAX%,=(4*5)             ;Load 20 into EAX%
TEST     FRED,=Z'FEFFFFFF'       ;Hex constant