Test berkeley-hardfloat fused multiply-add

test_fma.scala

  // Test berkeley-hardfloat fused multiply-add
  class Stuff(dut: MulAddRecFN2) extends PeekPokeTester(dut) {
    val floatToUInt: (Float) => UInt = (f) => f"h${java.lang.Float.floatToIntBits(1.0f)}%08X".U(32.W)
    val a = 3.33f
    val b = 2.0f
    val c = 1.0f
    val expected = a * b + c
    poke(dut.io.a, floatToUInt(a))
    poke(dut.io.b, floatToUInt(b))
    poke(dut.io.c, floatToUInt(c))
    poke(dut.io.op, 0.U)
    step(100)
    expect(dut.io.out, floatToUInt(expected), f"Actual parsed = ${java.lang.Float.intBitsToFloat(peek(dut.io.out).intValue())}")
  }