TNS/E Native Application Conversion Guide

Introduction to Native Mode
TNS/E Native Application Conversion Guide—529659-003
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Summary of Execution Modes
Summary of Execution Modes
A TNS process—a process that runs in TNS interpreted mode or TNS accelerated
mode—is initiated by running a TNS interpreted or accelerated object file.
A native process—a process that runs in native mode—is initiated by running a native
object file. Native object files consist entirely of Intel® Itanium® instructions. Native
processes do not maintain TNS architecture-specific constructs.
TNS/E systems support these execution modes:
Because of architectural differences between the execution modes, TNS interpreted
object code, accelerated object code, and native object code cannot be mixed in one
program file. A native program can contain only native object code.
Mode Characteristics of Mode
TNS interpreted
mode
•
Programs generated by TNS compilers.
•
Programs use TNS process and memory architecture.
•
Programs consist of TNS object code.
•
Programs consist of TNS instructions. Millicode routines implement
TNS instructions on Itanium processors.
TNS accelerated
mode
•
Programs generated by TNS compilers and processed by the Object
Code Accelerator (OCA).
•
Programs use TNS process and memory architecture.
•
Programs consist of TNS object code and accelerated object code.
•
Programs consist of TNS instructions and equivalent OCA-
generated Itanium instructions. Programs execute Itanium
instructions directly on Itanium processors. Programs transition to
TNS mode when OCA is unable to generate equivalent Itanium
instructions.
Native mode
•
Programs generated by native compilers.
•
Programs use native process and memory architecture.
•
Programs consist of native object code.
•
Programs consist of Itanium instructions which run directly on
Itanium processors.