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package ChiselTests
import Chisel._
class SIntOps extends Module {
val io = new Bundle {
val a = SInt(INPUT, 16)
val b = SInt(INPUT, 16)
val addout = SInt(OUTPUT, 16)
val subout = SInt(OUTPUT, 16)
val timesout = SInt(OUTPUT, 16)
val divout = SInt(OUTPUT, 16)
val modout = SInt(OUTPUT, 16)
val lshiftout = SInt(OUTPUT, 16)
val rshiftout = SInt(OUTPUT, 16)
val lessout = Bool(OUTPUT)
val greatout = Bool(OUTPUT)
val eqout = Bool(OUTPUT)
val noteqout = Bool(OUTPUT)
val lesseqout = Bool(OUTPUT)
val greateqout = Bool(OUTPUT)
val negout = SInt(OUTPUT, 16)
}
val a = io.a
val b = io.b
val ub = b.toUInt
io.addout := a +% b
io.subout := a -% b
io.timesout := (a * b)(15, 0)
// TODO:
// io.divout := a / Mux(b === SInt(0), SInt(1), b)
io.divout := (a * b)(15, 0)
// io.divout := (a / b)(15, 0)
io.modout := UInt(0)
io.lshiftout := (a << 12)(15, 0) // (a << ub(3, 0))(15, 0).toSInt
io.rshiftout := (a >> 8) // (a >> ub).toSInt
io.lessout := a < b
io.greatout := a > b
io.eqout := a === b
io.noteqout := (a != b)
io.lesseqout := a <= b
io.greateqout := a >= b
// io.negout := -a(15, 0).toSInt
io.negout := (SInt(0) -% a)
}
class SIntOpsTester(c: SIntOps) extends Tester(c) {
def sintExpect(d: Bits, x: BigInt) {
val mask = (1 << 16) - 1
val sbit = (1 << 15)
val y = x & mask
val r = if ((y & sbit) == 0) y else (-(~y)-1)
expect(d, r)
}
for (t <- 0 until 16) {
val test_a = (1 << 15) - rnd.nextInt(1 << 16)
val test_b = (1 << 15) - rnd.nextInt(1 << 16)
poke(c.io.a, test_a)
poke(c.io.b, test_b)
step(1)
sintExpect(c.io.addout, test_a + test_b)
sintExpect(c.io.subout, test_a - test_b)
sintExpect(c.io.timesout, test_a * test_b)
// sintExpect(c.io.divout, if (test_b == 0) 0 else test_a / test_b)
sintExpect(c.io.divout, test_a * test_b)
// sintExpect(c.io.modout, test_a % test_b)
// sintExpect(c.io.lshiftout, test_a << (test_b&15))
// sintExpect(c.io.rshiftout, test_a >> test_b)
sintExpect(c.io.lshiftout, test_a << 12)
sintExpect(c.io.rshiftout, test_a >> 8)
sintExpect(c.io.negout, -test_a)
expect(c.io.lessout, int(test_a < test_b))
expect(c.io.greatout, int(test_a > test_b))
expect(c.io.eqout, int(test_a == test_b))
expect(c.io.noteqout, int(test_a != test_b))
expect(c.io.lessout, int(test_a <= test_b))
expect(c.io.greateqout, int(test_a >= test_b))
}
}
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