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HP Pascal/HP-UX Release Notes: HP 9000 Series Systems > Chapter 1 New and Changed Features
+DS Command-Line Option |
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+DSmodel Performs instruction scheduling tuned for a particular implementation of the PA-RISC architecture. Object code with scheduling tuned for a particular model will execute on other HP 9000 systems, although possibly less efficiently. If you do not specify this option, the default instruction scheduling is for the system you are compiling on. If you plan to run your program on both PA-RISC 1.1 and 2.0 systems, use the +DS2.0 designation. Examples:
For more information:
model can be either a model number of an HP 9000 system (such as 725, 890, or G40), PA-RISC architecture designation 1.1 or 2.0, or one of the PA-RISC processor names such as PA7000, PA7100, PA7100LC, or PA8000. See the file /opt/langtools/lib/sched.models for model numbers and processor names. Instruction scheduling is different on different implementations of PA-RISC architectures. You can improve performance on a particular model or processor of the HP 9000 by requesting that the compiler use instruction scheduling tuned to that particular model or processor. Using scheduling for one model or processor does not prevent your program from executing on another model or processor. By default, the compiler performs scheduling tuned for the system on which you are compiling. Use the +DS option to change this default behavior and to specify instruction scheduling tuned to a particular implementation of PA-RISC. For example, to specify instruction scheduling for the model 867, use +DS867. To specify instruction scheduling for the PA-RISC 8000 processor, use +DSPA8000. See the file /opt/langtools/lib/sched.models for model numbers and processor names. When you use the +DS option depends on your particular circumstances.
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