SPL to HP C/XL Migration Guide (30231-90001)

7- 1
Chapter 7 Machine Level Constructs
This chapter discusses conversion issues related to sections in Chapter
6 of the
Systems Programming Language Reference Manual .
ASSEMBLE Statement
Table 7-1. ASSEMBLE Statement
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| SPL | HP C/XL Equivalent |
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| assemble-statement : | No equivalent. |
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| ASSEMBLE | |
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|({[ label-id :] instruction }[;...] )| |
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| Allows direct access to MPE V machine | Many of the instructions have functional |
| instructions. | equivalents in HP C/XL. See the example |
| | below. |
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| | In general, register manipulation |
| | instructions will have to be redesigned and |
| | rewritten, whereas memory reference |
| | instructions frequently have |
| | straightforward replacements. |
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| Example: | HP C/XL version: |
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| ASSEMBLE(INCM ivar); increment memory | ++ivar; same operation |
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DELETE, PUSH, SET, and WITH Statements
The SPL DELETE, PUSH, SET, and WITH statements directly manipulate the
MPE V hardware stack and registers.
In the absence of any assumed stack environment, HP C/XL has no direct
equivalent constructs. A stack could be emulated in an array, but, in
most cases, a simple redesign is preferable.