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package Chisel
// TODO: these operators should be backend nodes so their width can be
// inferred, rather than using getWidth. also, C++ perf would improve.
object Log2 {
def apply(x: Bits, width: Int): UInt = {
if (width < 2) UInt(0)
else if (width == 2) x(1)
else Mux(x(width-1), UInt(width-1), apply(x, width-1))
}
def apply(x: Bits): UInt = apply(x, x.getWidth)
}
object OHToUInt {
def apply(in: Seq[Bool]): UInt = apply(Vec(in))
def apply(in: Vec[Bool]): UInt = apply(in.toBits, in.size)
def apply(in: Bits): UInt = apply(in, in.getWidth)
def apply(in: Bits, width: Int): UInt = {
if (width <= 2) Log2(in, width)
else {
val mid = 1 << (log2Up(width)-1)
val hi = in(width-1, mid)
val lo = in(mid-1, 0)
Cat(hi.orR, apply(hi | lo, mid))
}
}
}
object PriorityEncoder {
def apply(in: Seq[Bool]): UInt = PriorityMux(in, (0 until in.size).map(UInt(_)))
def apply(in: Bits): UInt = apply(in.toBools)
}
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