ISA features … (contd.)

• Provide instructions that bind quantities known at compile time as constants - If something is known at compile time resolve it at compile time.

• Counter Example: CALLS of VAX architecture.

  • CALLS is procedure call in VAX ‘s ISA. Even though the list of registers to be saved on transfer control to the procedure is known at compile-time, the register saving process is included in the semantics of CALLS! So cannot be substituted with instruction at compile-time.

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