...Simulator

I grateful to the many students at UW who used SPIM in their courses and happily found bugs in a professor's code. In particular, the students in CS536, Spring 1990, painfully found the last few bugs in an ``already-debugged'' simulator. I am grateful for their patience and persistence. Alan Yuen-wui Siow wrote the X-window interface.

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...computers.

For a description of the real machines, see Gerry Kane, MIPS RISC Architecture, Prentice Hall, 1989.

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...segments.

These instructions are real-not pseudo-MIPS instructions. SPIM translates assembler pseudo instructions to 1-3 MIPS instructions before storing the program in memory. Although the instructions in memory look different from the source program, the translation is straight-forward and can be understood with a bit of practice.

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...values).

In earlier versions of SPIM (before 4.0), the type code was passed in register $a0 and the values were slightly different. Programs written for the older versions of SPIM need to be modified to reflect these changes.

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...pointer.

The MIPS compiler does not use a frame pointer, so this register is used as callee-saved register $s8.

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