Adds extension M instructions: not tested

src/main/scala/projet/Alu.scala

@@ -3,11 +3,15 @@ package projet
 import chisel3._
 import chisel3.util.switch
 import chisel3.util.is
+import chisel3.util.Cat
+import chisel3.util.Fill
 
 object AluOpCode extends ChiselEnum {
-    val Add, AddW, Sub, And, Or, Xor, ShiftLeft, ShiftRight,
+    val Add, AddW, Sub, Mul, Mulh, Mulhsu, Mulhu, Div, Divu, Rem, Remu, Mulw,
+        Divw, Divuw, Remw, Remuw, And, Or, Xor, ShiftLeft, ShiftRight,
         ShiftArithmeticRight, LessThanSigned, LessThanUnsigned,
-        GreaterEqualSigned, GreaterEqualUnsigned, Equal = Value
+        GreaterEqualSigned, GreaterEqualUnsigned, Equal =
+        Value
 }
 
 class Alu extends Module {
@@ -32,6 +36,63 @@ class Alu extends Module {
             io.out := io.a - io.b;
         }
 
+        is(Mul) {
+            io.out := (io.a.asSInt * io.b.asSInt).asUInt;
+        }
+
+        is(Mulh) {
+            io.out := ((io.a.asSInt * io.b.asSInt) >> 64.U).asUInt;
+        }
+
+        is(Mulhsu) {
+            io.out := ((io.a.asSInt * io.b).asSInt >> 64.U).asUInt;
+        }
+
+        is(Mulhu) {
+            io.out := (io.a * io.b) >> 64.U;
+        }
+
+        is(Div) {
+            io.out := (io.a.asSInt / io.b.asSInt).asUInt;
+        }
+
+        is(Divu) {
+            io.out := io.a / io.b;
+        }
+
+        is(Rem) {
+            io.out := (io.a.asSInt % io.b.asSInt).asUInt;
+        }
+
+        is(Remu) {
+            io.out := io.a % io.b;
+        }
+
+        is(Mulw) {
+            val res = (io.a.asSInt * io.b.asSInt).asUInt
+            io.out := Cat(Fill(32, res(31)), res(31, 0))
+        }
+
+        is(Divw) {
+            val res = (io.a(31, 0).asSInt / io.b(31, 0).asSInt).asUInt;
+            io.out := Cat(Fill(32, res(31)), res(31, 0));
+        }
+
+        is(Divuw) {
+            val res = io.a(31, 0) / io.b(31, 0);
+            io.out := Cat(Fill(32, res(31)), res(31, 0));
+        }
+
+        is(Remw) {
+            val res = (io.a(31, 0).asSInt % io.b(31, 0).asSInt).asUInt;
+            io.out := Cat(Fill(32, res(31)), res(31, 0));
+        }
+
+        is(Remuw) {
+            val res = io.a(31, 0) % io.b(31, 0);
+            io.out := Cat(Fill(32, res(31)), res(31, 0));
+        }
+
         is(And) {
             io.out := io.a & io.b;
         }