perilus

commit b3d3da633d592003778447152ee01711c5db2014
parent b2e69ab264d590e195cbcb2044e37bbc03122987
Author: Bradley Gannon <bradley@bradleygannon.com>
Date:   Sat, 29 Nov 2025 18:29:02 -0500

Implement Alu

Diffstat:
M
src/main/scala/alu.scala
 | 
15
+++++++++++++--
A
src/test/scala/perilus/alu.scala
 | 
128
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
M
src/test/scala/perilus/extendUnit.scala
 | 
1
+

3 files changed, 142 insertions(+), 2 deletions(-)
diff --git a/src/main/scala/alu.scala b/src/main/scala/alu.scala
@@ -10,6 +10,17 @@ class Alu extends Module {
     val aluResult = Output(UInt(32.W))
   })
 
-  // TODO implement
-  io.aluResult := 0.U
+  when(io.aluControl === "b000".U) {
+    io.aluResult := io.srcA + io.srcB
+  }.elsewhen(io.aluControl === "b001".U) {
+    io.aluResult := io.srcA - io.srcB
+  }.elsewhen(io.aluControl === "b010".U) {
+    io.aluResult := io.srcA & io.srcB
+  }.elsewhen(io.aluControl === "b011".U) {
+    io.aluResult := io.srcA | io.srcB
+  }.elsewhen(io.aluControl === "b101".U) {
+    io.aluResult := io.srcA < io.srcB
+  }.otherwise {
+    io.aluResult := 0.U
+  }
 }
diff --git a/src/test/scala/perilus/alu.scala b/src/test/scala/perilus/alu.scala
@@ -0,0 +1,128 @@
+import chisel3._
+import chisel3.simulator.scalatest.ChiselSim
+import org.scalatest.funspec.AnyFunSpec
+
+import com.rinthyAi.perilus.alu._
+
+class AluTests extends AnyFunSpec with ChiselSim {
+  describe("Alu") {
+    it("adds") {
+      simulate(new Alu) { extendUnit =>
+        {
+          extendUnit.io.aluControl.poke("b000".U)
+
+          extendUnit.io.srcA.poke("hb589e285".U)
+          extendUnit.io.srcB.poke("hc4289503".U)
+          extendUnit.io.aluResult.expect("h79b27788".U)
+
+          extendUnit.io.srcA.poke("hfa66f344".U)
+          extendUnit.io.srcB.poke("h7ff47b44".U)
+          extendUnit.io.aluResult.expect("h7a5b6e88".U)
+
+          extendUnit.io.srcA.poke("h644a658e".U)
+          extendUnit.io.srcB.poke("hb90e62f7".U)
+          extendUnit.io.aluResult.expect("h1d58c885".U)
+        }
+      }
+    }
+    it("subtracts") {
+      simulate(new Alu) { extendUnit =>
+        {
+          extendUnit.io.aluControl.poke("b001".U)
+
+          extendUnit.io.srcA.poke("hceab249".U)
+          extendUnit.io.srcB.poke("h124a55c3".U)
+          extendUnit.io.aluResult.expect("hfaa05c86".U)
+
+          extendUnit.io.srcA.poke("h819518ce".U)
+          extendUnit.io.srcB.poke("h9e8302de".U)
+          extendUnit.io.aluResult.expect("he31215f0".U)
+
+          extendUnit.io.srcA.poke("h5d49ddb8".U)
+          extendUnit.io.srcB.poke("h6f715aa2".U)
+          extendUnit.io.aluResult.expect("hedd88316".U)
+        }
+      }
+    }
+    it("computes bitwise AND") {
+      simulate(new Alu) { extendUnit =>
+        {
+          extendUnit.io.aluControl.poke("b010".U)
+
+          extendUnit.io.srcA.poke("h9ae8ddd".U)
+          extendUnit.io.srcB.poke("ha8387b0c".U)
+          extendUnit.io.aluResult.expect("h828090c".U)
+
+          extendUnit.io.srcA.poke("h96f36a94".U)
+          extendUnit.io.srcB.poke("h52e96078".U)
+          extendUnit.io.aluResult.expect("h12e16010".U)
+
+          extendUnit.io.srcA.poke("hf9209575".U)
+          extendUnit.io.srcB.poke("h931544ba".U)
+          extendUnit.io.aluResult.expect("h91000430".U)
+        }
+      }
+    }
+    it("computes bitwise OR") {
+      simulate(new Alu) { extendUnit =>
+        {
+          extendUnit.io.aluControl.poke("b011".U)
+
+          extendUnit.io.srcA.poke("hf4f16d52".U)
+          extendUnit.io.srcB.poke("h2f6464a1".U)
+          extendUnit.io.aluResult.expect("hfff56df3".U)
+
+          extendUnit.io.srcA.poke("h4ab77cc3".U)
+          extendUnit.io.srcB.poke("ha04edae1".U)
+          extendUnit.io.aluResult.expect("heafffee3".U)
+
+          extendUnit.io.srcA.poke("hcab1596a".U)
+          extendUnit.io.srcB.poke("hf5251288".U)
+          extendUnit.io.aluResult.expect("hffb55bea".U)
+        }
+      }
+    }
+    it("computes set if less than (SLT)") {
+      simulate(new Alu) { extendUnit =>
+        {
+          extendUnit.io.aluControl.poke("b101".U)
+
+          extendUnit.io.srcA.poke("h8a831306".U)
+          extendUnit.io.srcB.poke("h6e7ec46f".U)
+          extendUnit.io.aluResult.expect(0.U)
+
+          extendUnit.io.srcA.poke("hcd30f9c7".U)
+          extendUnit.io.srcB.poke("hb15d24bd".U)
+          extendUnit.io.aluResult.expect(0.U)
+
+          extendUnit.io.srcA.poke("h33b6db74".U)
+          extendUnit.io.srcB.poke("hd6faaa4d".U)
+          extendUnit.io.aluResult.expect(1.U)
+        }
+      }
+    }
+    it("outputs zero when aluControl is invalid") {
+      simulate(new Alu) { extendUnit =>
+        {
+          extendUnit.io.aluControl.poke("b100".U)
+
+          extendUnit.io.srcA.poke("hbe4fb61f".U)
+          extendUnit.io.srcB.poke("h1ea6db5b".U)
+          extendUnit.io.aluResult.expect(0.U)
+
+          extendUnit.io.aluControl.poke("b110".U)
+
+          extendUnit.io.srcA.poke("h9ba3e41f".U)
+          extendUnit.io.srcB.poke("h33abf507".U)
+          extendUnit.io.aluResult.expect(0.U)
+
+          extendUnit.io.aluControl.poke("b111".U)
+
+          extendUnit.io.srcA.poke("h6cd9a65b".U)
+          extendUnit.io.srcB.poke("h104e5235".U)
+          extendUnit.io.aluResult.expect(0.U)
+        }
+      }
+    }
+  }
+}
diff --git a/src/test/scala/perilus/extendUnit.scala b/src/test/scala/perilus/extendUnit.scala
@@ -1,6 +1,7 @@
 import chisel3._
 import chisel3.simulator.scalatest.ChiselSim
 import org.scalatest.funspec.AnyFunSpec
+
 import com.rinthyAi.perilus.extendUnit._
 
 class ExtendUnitTests extends AnyFunSpec with ChiselSim {