Implement LaneBitmask::getNumLanes and LaneBitmask::getHighestLane

This should eliminate most uses of countPopulation and Log2_32 on
the lane mask values.

llvm-svn: 308658

1 files changed, 3 insertions, 3 deletions

diff --git a/llvm/lib/CodeGen/SplitKit.cpp b/llvm/lib/CodeGen/SplitKit.cpp
index 323045f..aaaa342b 100644
--- a/llvm/lib/CodeGen/SplitKit.cpp
+++ b/llvm/lib/CodeGen/SplitKit.cpp
@@ -552,7 +552,7 @@ SlotIndex SplitEditor::buildCopy(unsigned FromReg, unsigned ToReg,
     if ((SubRegMask & ~LaneMask).any())
       continue;
 
-    unsigned PopCount = countPopulation(SubRegMask.getAsInteger());
+    unsigned PopCount = SubRegMask.getNumLanes();
     PossibleIndexes.push_back(Idx);
     if (PopCount > BestCover) {
       BestCover = PopCount;
@@ -583,8 +583,8 @@ SlotIndex SplitEditor::buildCopy(unsigned FromReg, unsigned ToReg,
 
       // Try to cover as much of the remaining lanes as possible but
       // as few of the already covered lanes as possible.
-      int Cover = countPopulation((SubRegMask & LanesLeft).getAsInteger())
-                - countPopulation((SubRegMask & ~LanesLeft).getAsInteger());
+      int Cover = (SubRegMask & LanesLeft).getNumLanes()
+                - (SubRegMask & ~LanesLeft).getNumLanes();
       if (Cover > BestCover) {
         BestCover = Cover;
         BestIdx = Idx;