| 1. | Ordinarily, when a function is invoked, branch or call instruction.
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| 2. | The code may be processed by an call instructions.
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| 3. | ;Trampolines : Many CPUs have smaller subroutine call instructions to access low memory.
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| 4. | Instead it is accessed by other programs and subsystems typically via a CALL instruction.
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| 5. | Some smaller instruction classes include the shift / rotate instructions and the procedure call instructions.
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| 6. | The canonical implementation is a register load of a constant followed by a call instruction.
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| 7. | The original instruction set did not have a subroutine call instruction and could only address one bank of memory.
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| 8. | This was accomplished using an MVS emulator that intercepted system calls at the Supervisor Call instruction ( SVC ) level.
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| 9. | With inlining, control drops through directly to the code for the function, without a branch or call instruction.
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| 10. | Instead the hardware and the OS provide a " gate " that may be the target of a Call instruction.
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