The following three problems in this Exercise refer to a function f that calls another function func. The code for C function func is already compiled in another module using the MIPS calling convention from Figure 2.14. The function declaration for func is “int func(int a, int b);”. The code for function f is as follows:

Figure 2.14

Right before your function f from Problem 2.19.4 returns, what do we know about contents of registers $t5, $s3, $ra, and $sp? Keep in mind that we know what the entire function f looks like, but for function func we only know its declaration.

Data from problem 2.19.4

Translate function f into MIPS assembly language, also using the MIPS calling convention from Figure 2.14. If you need to use registers $t0 through $t7, use the lower-numbered registers first.

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Name Register number $zero $v0-$vl $a0-$a3 $t0-$t7 $50-$s7 $t8-$t9 $gp $sp $fp $ra 0 2-3 4-7 8-15 16-23 24-25 28 29 30 31 The constant value 0 Values for results and expression evaluation Arguments Temporaries Usage Saved More temporaries Global pointer Stack pointer Frame pointer Return address Preserved on call? n.a. no no no yes no yes yes yes yes