Fix fp exception by rounding right after MulRawFN

src/test/scala/radiance/TensorDPUTest.scala

@@ -62,7 +62,7 @@ class TensorDotProductUnitTest extends AnyFlatSpec with ChiselScalatestTester {
         c.io.in.bits.b(1).poke(0x4400.U(16.W))
         c.io.in.bits.b(2).poke(0x4600.U(16.W))
         c.io.in.bits.b(3).poke(0x4800.U(16.W))
-        c.io.in.bits.c   .poke(0x4880.U(16.W))
+        c.io.in.bits.c   .poke(0x41100000L.U(32.W))
 
         c.io.out.valid.expect(false.B)
 
@@ -93,6 +93,42 @@ class TensorDotProductUnitTest extends AnyFlatSpec with ChiselScalatestTester {
       }
   }
 
+  it should "pass fp16 2" in {
+    test(new TensorDotProductUnit(half = true))
+      .withAnnotations(Seq(VerilatorBackendAnnotation))
+      // .withAnnotations(Seq(WriteVcdAnnotation))
+      { c =>
+        c.io.in.valid.poke(true.B)
+        c.io.stall.poke(false.B)
+        c.io.in.bits.a(0).poke(0x0000.U(16.W))
+        c.io.in.bits.a(1).poke(0x3c00.U(16.W))
+        c.io.in.bits.a(2).poke(0x4000.U(16.W))
+        c.io.in.bits.a(3).poke(0x4200.U(16.W))
+        c.io.in.bits.b(0).poke(0x0000.U(16.W))
+        c.io.in.bits.b(1).poke(0x4800.U(16.W))
+        c.io.in.bits.b(2).poke(0x4c00.U(16.W))
+        c.io.in.bits.b(3).poke(0x4e00.U(16.W))
+        c.io.in.bits.c   .poke(0x00000000.U(32.W))
+
+        c.io.out.valid.expect(false.B)
+
+        c.clock.step()
+        c.io.in.valid.poke(false.B)
+        c.io.out.valid.expect(false.B)
+
+        c.clock.step()
+        c.clock.step()
+        c.clock.step()
+        // 4-cycle latency
+        c.io.out.valid.expect(true.B)
+        c.io.out.bits.data.expect(0x42e00000L.U)
+
+        c.clock.step()
+
+        c.io.out.valid.expect(false.B)
+      }
+  }
+
   it should "pass fp32" in {
     test(new TensorDotProductUnit(half = false))
       // .withAnnotations(Seq(VerilatorBackendAnnotation))