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Instruction Descriptions 4–149
4.12 VAX Compatibility Instructions
Alpha provides the instructions shown in Table 4–18 for use in translated VAX code. These
instructions are not a permanent part of the architecture and will not be available in some
future implementations. They are intended to preserve customer assumptions about VAX
instruction atomicity in porting code from VAX to Alpha.
These instructions should be generated only by the VAX-to-Alpha software translator; they
should never be used in native Alpha code. Any native code that uses them may cease to work.
Table 4–18: VAX Compatibility Instructions Summary
Mnemonic Operation
RC Read and Clear
RS Read and Set