Review<title> </head> <body> <h1 align="center">Instructions Review</h1> <p>Instructions Review studied in the course until now. Exercises about these instructions. <table> <tr> <td><b>Instruction</b></td> <td><b>Example</b></td> <td><b>Use</b></td> </tr> <tr> <td>and, andi</td> <td>and $t0, $t1, $t2</td> <td>Verify if a bit is set and unset a bit</td> </tr> <tr> <td>or, ori</td> <td>or $t0, $t1, $t2</td> <td>Set a bit</td> </tr> <tr> <td>nor</td> <td>nor $t0, $t1, $t2</td> <td>Detect zeros in both operands and invert bits</td> </tr> <tr> <td>xor</td> <td>xor $t0, $t1, $t2</td> <td>Detect positions with differents bits and invert bits</td> </tr> <tr> <td>sll, sllv</td> <td>sll $t0, $t1, shif</td> <td>multiplication, left shift<td> </tr> <tr> <td>srl, srlv</td> <td>srl $t0, $t1, shif</td> <td>division, right shift</td> </tr> <tr> <td>add, sub</td> <td>add $t0, $t1, $t2</td> <td> addition and subtration</td> </tr> <tr> <td>slt, slti, sltu, sltiu, sge, sgt, etc</td> <td>slt $t0, $t1, $t2</td> <td>comparation</td> </tr> <tr> <td>mult, multu</td> <td>mult $t0, $t1</td> <td>multiplication</td> </tr> <tr> <td>div, divu</td> <td>div $t0, $t1</td> <td>division</td> </tr> <tr> <td>mflo</td> <td>mflo $t0</td> <td>Access the low part of multiplication and division special register</td> </tr> <tr> <td>mfhi</td> <td>mfhi $t0</td> <td>Access the high part of multiplication and division special register</td> </tr> <tr> <td>lw, li, la</td> <td>lw $t0, 0($t1)</td> <td> load a word, a immediate value or a address</td> </tr> <table> <h3<Exercises</h3> <p>1 - Write in assembly the expression: (10 * X) - (20 / Y) + 50. The result must be in the register $t0. Use $t1 for X and $t2 for Y. The initial values for X e Y are 5 and 3. Use the instructions add, sub, mult, div, mflo and mfhi. Print the value $t0 in the end (calling print_elemet). What is this value?<br><br> 2 - Give the code below, what is the final result in $t0 and $t1? Print the registers values after each operation.<br> ori $t0, $0, 4<br> xor $t1, $t0, $0<br> sll $t1, $t0, $t1<br> srl $t0, $t0, 2<br> nor $t0, $0, $t0<br> nor $t1, $0, $t1<br><br> 3 - The instruction swap $R1, $R2, copy the $R1 value to $R2 and the $R2 value to $R1. Implement this instruction using only the R1 and R2 registers. The initial value of R1 and R2 are 4 and 2. Use the instruction XOR. </p> <h3>Files</h3> <ul> <li><a href="ex1.asm">Exercise 1</a></li> <li><a href="ex2.asm">Exercise 2</a></li> <li><a href="ex3.asm">Exercise 3</a></li> </ul> </body> </html>