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diplomacy: add legalize method to AddressSet

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Henry Cook
2017-05-09 11:12:17 -07:00
parent 3af40bff8b
commit 5f3a4ada1b
2 changed files with 5 additions and 2 deletions
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3
src/main/scala/diplomacy/Parameters.scala
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@ -126,6 +126,9 @@ case class AddressSet(base: BigInt, mask: BigInt) extends Ordered[AddressSet]
def contains(x: BigInt) = ((x ^ base) & ~mask) == 0
def contains(x: UInt) = ((x ^ UInt(base)).zext() & SInt(~mask)) === SInt(0)
// turn x into an address contained in this set
def legalize(x: UInt): UInt = base.U | (mask.U & x)
// overlap iff bitwise: both care (~mask0 & ~mask1) => both equal (base0=base1)
def overlaps(x: AddressSet) = (~(mask | x.mask) & (base ^ x.base)) == 0
// contains iff bitwise: x.mask => mask && contains(x.base)