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Merge pull request #99 from ucb-bar/mask_penalty

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Macrocompiler should prioritize memories with no masks with DefaultCostMetric
This commit is contained in:
Jerry Zhao
2021-03-11 17:57:15 -08:00
committed by GitHub
parent 12d0c25a98 bca38967f8
commit c8f3d343b9
1 changed files with 5 additions and 1 deletions
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6
macros/src/main/scala/barstools/macros/CostMetric.scala
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@@ -126,6 +126,10 @@ object DefaultMetric extends CostMetric with CostMetricCompanion {
else (mem.src.width / p) * m //Waste the extra maskbits else (mem.src.width / p) * m //Waste the extra maskbits
} }
} }
val maskPenalty = (memMask, libMask) match {
case (None, Some(m)) => 0.001
case (_, _) => 0
}
val depthCost = math.ceil(mem.src.depth.toDouble / lib.src.depth.toDouble) val depthCost = math.ceil(mem.src.depth.toDouble / lib.src.depth.toDouble)
val widthCost = math.ceil(memWidth.toDouble / lib.src.width.toDouble) val widthCost = math.ceil(memWidth.toDouble / lib.src.width.toDouble)
val bitsCost = (lib.src.depth * lib.src.width).toDouble val bitsCost = (lib.src.depth * lib.src.width).toDouble
@@ -134,7 +138,7 @@ object DefaultMetric extends CostMetric with CostMetricCompanion {
val bitsWasted = depthCost * widthCost * bitsCost - requestedBits val bitsWasted = depthCost * widthCost * bitsCost - requestedBits
val wastedConst = 0.05 // 0 means waste as few bits with no regard for instance count val wastedConst = 0.05 // 0 means waste as few bits with no regard for instance count
val costPerInst = wastedConst * depthCost * widthCost val costPerInst = wastedConst * depthCost * widthCost
Some(1.0 * bitsWasted / requestedBits + costPerInst) Some(1.0 * bitsWasted / requestedBits + costPerInst + maskPenalty)
} }
override def commandLineParams = Map() override def commandLineParams = Map()