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Cleanup padding logic

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This commit is contained in:
Hansung Kim
2023-03-31 20:11:11 -07:00
parent 3ee639f376
commit 92ad5c2548
1 changed files with 11 additions and 12 deletions
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23
src/main/scala/tilelink/Coalescing.scala
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@@ -488,29 +488,28 @@ class CoalShiftQueue[T <: Data](
private val used = RegInit(UInt(entries.W), 0.U)
private val elts = Reg(Vec(entries, gen))
def paddedValid(i: Int) = if (i == -1) true.B else if (i == entries) false.B else valid(i)
def paddedUsed(i: Int) = if (i == -1) true.B else if (i == entries) false.B else used(i)
def paddedValidAfterInvalidate(i: Int) =
if (i == -1) true.B
else if (i == entries) false.B
else Mux(io.invalidate(i), false.B, paddedValid(i))
def pad(mask: Int => Bool) = { i: Int =>
if (i == -1) true.B else if (i == entries) false.B else mask(i)
}
def paddedUsed = pad({ i: Int => used(i) })
def validAfterInv(i: Int) = Mux(io.invalidate(i), false.B, valid(i))
val shift = io.deq.ready || (used =/= 0.U) && !paddedValidAfterInvalidate(0)
val shift = io.deq.ready || (used =/= 0.U) && !validAfterInv(0)
for (i <- 0 until entries) {
val wdata = if (i == entries - 1) io.enq.bits else Mux(!used(i + 1), io.enq.bits, elts(i + 1))
val wen = Mux(
shift,
(io.enq.fire && !paddedUsed(i + 1) && used(i)) || paddedValidAfterInvalidate(i + 1),
(io.enq.fire && !paddedUsed(i + 1) && used(i)) || pad(validAfterInv)(i + 1),
// enqueue to the first empty slot above the top
(io.enq.fire && paddedUsed(i - 1) && !used(i)) || !paddedValidAfterInvalidate(i)
(io.enq.fire && paddedUsed(i - 1) && !used(i)) || !validAfterInv(i)
)
when(wen) { elts(i) := wdata }
valid(i) := Mux(
shift,
(io.enq.fire && !paddedUsed(i + 1) && used(i)) || paddedValidAfterInvalidate(i + 1),
(io.enq.fire && !paddedUsed(i + 1) && used(i)) || pad(validAfterInv)(i + 1),
// TODO: handle enqueueing to invalidated tail?
(io.enq.fire && paddedUsed(i - 1) && !used(i)) || paddedValidAfterInvalidate(i)
(io.enq.fire && paddedUsed(i - 1) && !used(i)) || validAfterInv(i)
)
}
@@ -523,7 +522,7 @@ class CoalShiftQueue[T <: Data](
}
io.enq.ready := !valid(entries - 1)
io.deq.valid := paddedValidAfterInvalidate(0)
io.deq.valid := validAfterInv(0)
io.deq.bits := elts.head
assert(!flow, "flow-through is not implemented")