- 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.
- For a description of the real machines, see Gerry Kane
and Joe Heinrich, MIPS RISC Architecture, Prentice Hall, 1992.
instructions are real---not pseudo---MIPS instructions. SPIM
translates assembler pseudoinstructions to 1--3 MIPS instructions
before storing the program in memory. Each source instruction appears
as a comment on the first instruction to which it is translated.
- In earlier version of SPIM, $sp was documented as pointing at the first free word on the stack (not
the last word of the stack frame). Recent MIPS documents have made it clear
that this was an error. Both conventions work equally well, but we choose
to follow the real system.
- The MIPS compiler does not use a frame pointer, so this
register is used as callee-saved register $s8.