o

firrtl.passes

toBitMask

object toBitMask

Given a mask, return a bitmask corresponding to the desired datatype. Requirements:

  • The mask type and datatype must be equivalent, except any ground type in datatype must be matched by a 1-bit wide UIntType.
  • The mask must be a reference, subfield, or subindex The bitmask is a series of concatenations of the single mask bit over the length of the corresponding ground type, e.g.:
wire mask: {x: UInt<1>, y: UInt<1>}
wire data: {x: UInt<2>, y: SInt<2>}
// this would return:
cat(cat(mask.x, mask.x), cat(mask.y, mask.y))
Source
MemUtils.scala
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