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Diffstat (limited to 'src/main/scala/chisel/util/OneHot.scala')
| -rw-r--r-- | src/main/scala/chisel/util/OneHot.scala | 64 |
1 files changed, 0 insertions, 64 deletions
diff --git a/src/main/scala/chisel/util/OneHot.scala b/src/main/scala/chisel/util/OneHot.scala deleted file mode 100644 index ef21c65d..00000000 --- a/src/main/scala/chisel/util/OneHot.scala +++ /dev/null @@ -1,64 +0,0 @@ -// See LICENSE for license details. - -/** Circuit generators for working with one-hot representations. - */ - -package chisel.util - -import chisel._ - -/** Converts from One Hot Encoding to a UInt indicating which bit is active - * This is the inverse of [[Chisel.UIntToOH UIntToOH]]*/ -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)) - } - } -} - -/** @return the bit position of the trailing 1 in the input vector - * with the assumption that multiple bits of the input bit vector can be set - * @example {{{ data_out := PriorityEncoder(data_in) }}} - */ -object PriorityEncoder { - def apply(in: Seq[Bool]): UInt = PriorityMux(in, (0 until in.size).map(UInt(_))) - def apply(in: Bits): UInt = apply(in.toBools) -} - -/** Returns the one hot encoding of the input UInt. - */ -object UIntToOH -{ - def apply(in: UInt, width: Int = -1): UInt = - if (width == -1) { - UInt(1) << in - } else { - (UInt(1) << in(log2Up(width)-1,0))(width-1,0) - } -} - -/** Returns a bit vector in which only the least-significant 1 bit in - the input vector, if any, is set. - */ -object PriorityEncoderOH -{ - private def encode(in: Seq[Bool]): UInt = { - val outs = Seq.tabulate(in.size)(i => UInt(BigInt(1) << i, in.size)) - PriorityMux(in :+ Bool(true), outs :+ UInt(0, in.size)) - } - def apply(in: Seq[Bool]): Seq[Bool] = { - val enc = encode(in) - Seq.tabulate(in.size)(enc(_)) - } - def apply(in: Bits): UInt = encode((0 until in.getWidth).map(i => in(i))) -} |
