C/C++ Programmer's Guide (G06.27+, H06.03+)

HP C/C++ Programmer’s Guide for NonStop Systems—429301-010
xxvii
About This Guide
This guide describes the implementation of the C and C++ programming languages for
HP NonStop systems. This guide describes these products:
•
TNS C compiler in the Guardian and G-series OSS environments.
•
TNS C preprocessor (Cprep) and TNS C++ translator (Cfront) in the Guardian and
G-series OSS environments.
•
TNS/R and TNS/E native C and C++ compilers in the Guardian and OSS
environments.
•
TNS/R and TNS/E native C/C++ cross compiler on the PC in ETK and TDS.
•
TNS C run-time library in the Guardian and G-series OSS environments.
•
TNS/R and TNS/E native C run-time library in the Guardian and OSS
environments.
•
TNS C++ run-time library in the Guardian and G-series OSS environments.
•
TNS/R and TNS/E native C++ run-time library in the Guardian and OSS
environments.
The term TNS means that a program uses the process, memory, and instruction set
architectures of the HP TNS systems. TNS compilers generate TNS instructions based
on complex instruction-set computing (CISC) technology. The Accelerator takes these
TNS instructions and generates corresponding instructions based on reduced
instruction-set computing (RISC) technology; the Object Code Accelerator takes these
TNS instructions and generates corresponding instructions based on Intel Itanium
technology. A TNS process is one that runs in TNS mode or accelerated mode.
The term TNS/R native means a program uses the process, memory, and instruction
set architectures that are native to RISC processors. The term TNS/E native means a
program uses the process, memory, and instruction set architectures that are native to
Intel Itanium processors. The term native mode
means a program uses the process,
memory, and instruction set architectures that are native to either type of processor.
Native object files consist entirely of RISC or Itanium instructions. Unlike TNS
processes, native processes do not maintain TNS architecture-specific constructs.
Native mode enables you to write programs that are fully optimized for TNS/R or
TNS/E systems such as NonStop servers.
While native mode offers many benefits, you are not required to convert your programs
to native mode. The G0x and H0x release version updates (RVUs) continue to support
the TNS compilers and tools. You can continue to create and run TNS and accelerated
object code and gain some of the performance benefits provided by code that has
been converted to native mode.