Move the SplatByte helper to APInt and generalize it a bit.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175621 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
index a9d40d0..f085e44 100644
--- a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
@@ -2539,18 +2539,6 @@
}
}
-/// SplatByte - Distribute ByteVal over NumBits bits.
-// FIXME: Move this helper to a common place.
-static APInt SplatByte(unsigned NumBits, uint8_t ByteVal) {
- APInt Val = APInt(NumBits, ByteVal);
- unsigned Shift = 8;
- for (unsigned i = NumBits; i > 8; i >>= 1) {
- Val = (Val << Shift) | Val;
- Shift <<= 1;
- }
- return Val;
-}
-
/// ExpandBitCount - Expand the specified bitcount instruction into operations.
///
SDValue SelectionDAGLegalize::ExpandBitCount(unsigned Opc, SDValue Op,
@@ -2568,10 +2556,10 @@
// This is the "best" algorithm from
// http://graphics.stanford.edu/~seander/bithacks.html#CountBitsSetParallel
- SDValue Mask55 = DAG.getConstant(SplatByte(Len, 0x55), VT);
- SDValue Mask33 = DAG.getConstant(SplatByte(Len, 0x33), VT);
- SDValue Mask0F = DAG.getConstant(SplatByte(Len, 0x0F), VT);
- SDValue Mask01 = DAG.getConstant(SplatByte(Len, 0x01), VT);
+ SDValue Mask55 = DAG.getConstant(APInt::getSplat(Len, APInt(8, 0x55)), VT);
+ SDValue Mask33 = DAG.getConstant(APInt::getSplat(Len, APInt(8, 0x33)), VT);
+ SDValue Mask0F = DAG.getConstant(APInt::getSplat(Len, APInt(8, 0x0F)), VT);
+ SDValue Mask01 = DAG.getConstant(APInt::getSplat(Len, APInt(8, 0x01)), VT);
// v = v - ((v >> 1) & 0x55555555...)
Op = DAG.getNode(ISD::SUB, dl, VT, Op,