release for PA-RISC 1.0 systems, so code generated by the HP-UX 10.20 release of HP compilers is not supported on PA-RISC 1.0 systems.

NOTE: The +DA1.0 option will be obsolete in a future release. You can achieve better performance on PA-RISC 1.1 and 2.0 systems by not using this option.

PA-RISC 2.0 Compatibility

The instruction set on PA-RISC 2.0 is a superset of the instruction set on PA-RISC 1.1. As a result, code generated for PA-RISC 1.1 systems run on PA-RISC 2.0 systems. However, code generated for PA-RISC 2.0 systems does not run on PA-RISC 1.1 or 1.0. If you have enabled the +vcompatwarnings, the linker displays the following hardware compatibility warning whenever it links in any PA-RISC 2.0 object files:

/usr/ccs/bin/ld: (Warning) At least one PA 2.0 object file (sum.o) was detected. The linked output may not run on PA 1.x system.

If you try to run a PA-RISC 2.0 program on a 1.1 system, you see a message like:

$ a.out

ksh: ./a.out: Executable file incompatible with hardware

In this example, the +DAportable compiler option can be used to create code compatible with PA-RISC 1.1 and 2.0 systems.

PA-RISC Architectures and Their System Models

The HP 9000 PA-RISC (Precision Architecture Reduced Instruction Set Computing) Series 700/800 family of workstations and servers has evolved from the following versions of PA-RISC architecture:

Table 13 Versions of PA-RISC architecture

PA-RISC 1.0

The original version of PA-RISC was first introduced on Series 800 servers. The following Series

 

were included: 840, 825, 835/SE, 845/SE, 850, 855, 860, 865, 870/x00, 822, 832, 842,

 

852, 890, 808, 815, 635, 645.

 

 

PA-RISC 1.1

The second version of PA-RISC was first introduced on Series 700 workstations. Newer Series

 

800 systems also use this version of the architecture. The following Series were included: 700,

 

705, 710, 712, 715, 720, 725, 730, 735, 750, 755, B132L, B160L, B132L+, B180L, C100,

 

C110, J200, J210, J210XC, 742i, 742rt, 743i, 743rt, 745i, 747i, 748i, 8x7, D (except Dx70,

 

Dx80), E, F, G, H, I, K (except Kx50, Kx60, Kx70), T500, T520.

 

 

PA-RISC 2.0

This is the latest version of PA-RISC. The following Series are included: B2600/C3000, C160,

 

C180, C180XP, C200, C240, J280, J282, J2240, Dx70, Dx80, Kx50, Kx60, Kx70, T600,

 

V2200.

 

 

For More Information

•See your compiler online help or documentation for more information on the +DA option.

•See the file /opt/langtools/lib/sched.models for a complete list of model numbers and their architectures. Use the command model to determine the model number of your system.

Link-time Differences Between SOM (PA32) and ELF (PA64 and Itanium)

This section summarizes the significant PA32 (System Object Module (SOM) file) features, behavior, and options that linker does not support in PA64 mode and Itanium-based 32-bit and 64-bit mode (Executable and Linking Format (ELF) file format). The following table summarizes the differences in option, behavior, and toolset between PA-32 and IPF/PA-64 bit modes (IPF (64-bit and 32-bit) and PA-64):

80 Linker Toolset Differences Between PA-RISC and Itanium-Based Systems