F.1. HP-UX C Compilers
The C compilers for HP-UX support inline assembly for Itanium program development with intrinsic functions in the form of _Asm_ opcode (...). This extension to the C language has the syntax:
result = _Asm_ opcode( completers, operands, constraints );
where result and operands are expressed as unsigned 64-bit integers in the places where the corresponding Itanium assembly language statement would use general registers. A header file provides the definitions necessary to use inline assembly in a C program.
Markstein illustrates the usefulness of inline assembly extensions for producing and maintaining optimized floating-point libraries. Inline assembly allows retention of the full precision of the Itanium register format ...
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