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Only use powers of two masks, for now

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This commit is contained in:
Edward Wang
2017-07-21 10:33:29 -07:00
committed by edwardcwang
parent cf0d40f658
commit bb2783994a
2 changed files with 6 additions and 0 deletions
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3
tapeout/src/main/scala/transforms/macros/MacroCompiler.scala
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@@ -178,6 +178,9 @@ class MacroCompilerPass(mems: Option[Seq[Macro]],
} else { } else {
require(libPort.src.effectiveMaskGran == 1, "only single-bit mask supported for now") require(libPort.src.effectiveMaskGran == 1, "only single-bit mask supported for now")
require(isPowerOfTwo(memPort.src.effectiveMaskGran), "only powers of two masks supported for now")
require(isPowerOfTwo(libPort.src.effectiveMaskGran), "only powers of two masks supported for now")
cat(((low to high) map (i => bits(WRef(mem), i / memPort.src.effectiveMaskGran))).reverse) cat(((low to high) map (i => bits(WRef(mem), i / memPort.src.effectiveMaskGran))).reverse)
} }
case None => case None =>

3
tapeout/src/main/scala/transforms/macros/Utils.scala
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@@ -93,4 +93,7 @@ object Utils {
case Some(ActiveLow) | Some(NegativeEdge) => not(exp) case Some(ActiveLow) | Some(NegativeEdge) => not(exp)
case _ => exp case _ => exp
} }
// Check if a number is a power of two
def isPowerOfTwo(x: Int): Boolean = (x & (x - 1)) == 0
} }