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Diffstat (limited to 'src/main/scala/chisel/util/Bitwise.scala')
| -rw-r--r-- | src/main/scala/chisel/util/Bitwise.scala | 74 |
1 files changed, 0 insertions, 74 deletions
diff --git a/src/main/scala/chisel/util/Bitwise.scala b/src/main/scala/chisel/util/Bitwise.scala deleted file mode 100644 index d7d62ea3..00000000 --- a/src/main/scala/chisel/util/Bitwise.scala +++ /dev/null @@ -1,74 +0,0 @@ -// See LICENSE for license details. - -/** Miscellaneous circuit generators operating on bits. - */ - -package chisel.util - -import chisel._ -import chisel.core.SeqUtils - -object FillInterleaved -{ - def apply(n: Int, in: UInt): UInt = apply(n, in.toBools) - def apply(n: Int, in: Seq[Bool]): UInt = Vec(in.map(Fill(n, _))).toBits -} - -/** Returns the number of bits set (i.e value is 1) in the input signal. - */ -object PopCount -{ - def apply(in: Iterable[Bool]): UInt = SeqUtils.count(in.toSeq) - def apply(in: Bits): UInt = apply((0 until in.getWidth).map(in(_))) -} - -/** Fill fans out a UInt to multiple copies */ -object Fill { - /** Fan out x n times */ - def apply(n: Int, x: UInt): UInt = { - n match { - case 0 => UInt(width=0) - case 1 => x - case y if n > 1 => - val p2 = Array.ofDim[UInt](log2Up(n + 1)) - p2(0) = x - for (i <- 1 until p2.length) - p2(i) = Cat(p2(i-1), p2(i-1)) - Cat((0 until log2Up(y + 1)).filter(i => (y & (1 << i)) != 0).map(p2(_))) - case _ => throw new IllegalArgumentException(s"n (=$n) must be nonnegative integer.") - } - } - /** Fan out x n times */ - def apply(n: Int, x: Bool): UInt = - if (n > 1) { - UInt(0,n) - x - } else { - apply(n, x: UInt) - } -} - -/** Litte/big bit endian convertion: reverse the order of the bits in a UInt. -*/ -object Reverse -{ - private def doit(in: UInt, length: Int): UInt = { - if (length == 1) { - in - } else if (isPow2(length) && length >= 8 && length <= 64) { - // This esoterica improves simulation performance - var res = in - var shift = length >> 1 - var mask = UInt((BigInt(1) << length) - 1, length) - do { - mask = mask ^ (mask(length-shift-1,0) << shift) - res = ((res >> shift) & mask) | ((res(length-shift-1,0) << shift) & ~mask) - shift = shift >> 1 - } while (shift > 0) - res - } else { - val half = (1 << log2Up(length))/2 - Cat(doit(in(half-1,0), half), doit(in(length-1,half), length-half)) - } - } - def apply(in: UInt): UInt = doit(in, in.getWidth) -} |
