Register Window with appropriate window.
![Register Window Register Window](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhulhyphenhyphenDHLBlDinheKq_lECb4sPD0KPLlsw4k87qMdMPrKd0aNfHS7TLKddclpi-Rs1oz8f_SrBk-RVSRp1Ow1mqVT-IV77p0nuCL8t6I7uqqVB04UymG-OB-_MMCArzRZvfF8RfVC-6p7Y/w400-h328/Register+Window.PNG) |
Register Window |
Integer Unit: Register Window
- When a procedure is called, the register window shifts by sixteen registers, hiding the old input registers and old local registers and making the old output registers the new input registers.
- Input registers : arguments are passed to a function
- Local registers: to store any local data.
- Output registers: When calling a function, the programmer puts his argument in these registers.
![Circular Arrangement of Register Window Circular Arrangement of Register Window](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEio2AhOls1ML3vgIpu-1Xwi_jwdv5gOvfj1F75FBMZGvpH4ZTeW_RiMDqc69OKKzUqBdQwg7Tk1Y2p1v9DLfb54OmekAcAZvdCASno0CV_tUuepJxBNd2Y0CxijxZUJIl-AmJKXcUGPZAU/w300-h320/Circular+Arrangement+of+Register+Window.png) |
Circular Arrangement of Register Window |
Advantage: Register Window
- Make very fast procedure calls as they avoid the need to save a processor’s current in memory, further reducing off-chip traffic.
- Instead, the state variables are held in the current window, and the next window is opened for the new procedure.
- A refinement on this idea in that the input and output registers of adjacent windows overlap, allowing variables and parameters to be passed to the next process without physically moving data.
- The additional registers are hidden from view until you call a subroutine or other function. Where other processors would push parameters on a stack for the called routine to pop off, SPARC processors just "rotate" the register window to give the called routine a fresh set of registers.
- The old window and the new window overlap, so that some registers are shared.
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