Combine PPC's GetConstantBuildVectorBits and isConstantSplat functions to a new

method in a BuildVectorSDNode "pseudo-class".

llvm-svn: 65747

1 files changed, 91 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index 171ddbdad51..9dfd6be9d5b 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -5554,3 +5554,94 @@ const Type *ConstantPoolSDNode::getType() const {
     return Val.MachineCPVal->getType();
   return Val.ConstVal->getType();
 }
+
+// If this is a splat (repetition) of a value across the whole vector, return
+// the smallest size that splats it.  For example, "0x01010101010101..." is a
+// splat of 0x01, 0x0101, and 0x01010101.  We return SplatBits = 0x01 and
+// SplatSize = 1 byte.
+bool BuildVectorSDNode::isConstantSplat(unsigned &SplatBits,
+                                        unsigned &SplatUndef,
+                                        unsigned &SplatSize,
+                                        bool &HasAnyUndefs) {
+  uint64_t Bits128[2];
+  uint64_t Undef128[2];
+
+  // If this is a vector of constants or undefs, get the bits.  A bit in
+  // UndefBits is set if the corresponding element of the vector is an
+  // ISD::UNDEF value.  For undefs, the corresponding VectorBits values are
+  // zero.
+
+  // Start with zero'd results.
+  Bits128[0] = Bits128[1] = Undef128[0] = Undef128[1] = 0;
+
+  unsigned EltBitSize = getOperand(0).getValueType().getSizeInBits();
+  for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
+    SDValue OpVal = getOperand(i);
+
+    unsigned PartNo = i >= e/2;     // In the upper 128 bits?
+    unsigned SlotNo = e/2 - (i & (e/2-1))-1;  // Which subpiece of the uint64_t.
+
+    uint64_t EltBits = 0;
+    if (OpVal.getOpcode() == ISD::UNDEF) {
+      uint64_t EltUndefBits = ~0U >> (32-EltBitSize);
+      Undef128[PartNo] |= EltUndefBits << (SlotNo*EltBitSize);
+      continue;
+    } else if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(OpVal)) {
+      EltBits = CN->getZExtValue() & (~0U >> (32-EltBitSize));
+    } else if (ConstantFPSDNode *CN = dyn_cast<ConstantFPSDNode>(OpVal)) {
+      assert(CN->getValueType(0) == MVT::f32 &&
+             "Only one legal FP vector type!");
+      EltBits = FloatToBits(CN->getValueAPF().convertToFloat());
+    } else {
+      // Nonconstant element.
+      return false;
+    }
+
+    Bits128[PartNo] |= EltBits << (SlotNo*EltBitSize);
+  }
+
+  // Don't let undefs prevent splats from matching.  See if the top 64-bits are
+  // the same as the lower 64-bits, ignoring undefs.
+  if ((Bits128[0] & ~Undef128[1]) != (Bits128[1] & ~Undef128[0]))
+    return false;  // Can't be a splat if two pieces don't match.
+
+  uint64_t Bits64  = Bits128[0] | Bits128[1];
+  uint64_t Undef64 = Undef128[0] & Undef128[1];
+
+  // Check that the top 32-bits are the same as the lower 32-bits, ignoring
+  // undefs.
+  if ((Bits64 & (~Undef64 >> 32)) != ((Bits64 >> 32) & ~Undef64))
+    return false;  // Can't be a splat if two pieces don't match.
+
+  HasAnyUndefs = (Undef128[0] | Undef128[1]) != 0;
+
+  uint32_t Bits32  = uint32_t(Bits64) | uint32_t(Bits64 >> 32);
+  uint32_t Undef32 = uint32_t(Undef64) & uint32_t(Undef64 >> 32);
+
+  // If the top 16-bits are different than the lower 16-bits, ignoring
+  // undefs, we have an i32 splat.
+  if ((Bits32 & (~Undef32 >> 16)) != ((Bits32 >> 16) & ~Undef32)) {
+    SplatBits = Bits32;
+    SplatUndef = Undef32;
+    SplatSize = 4;
+    return true;
+  }
+
+  uint16_t Bits16  = uint16_t(Bits32)  | uint16_t(Bits32 >> 16);
+  uint16_t Undef16 = uint16_t(Undef32) & uint16_t(Undef32 >> 16);
+
+  // If the top 8-bits are different than the lower 8-bits, ignoring
+  // undefs, we have an i16 splat.
+  if ((Bits16 & (uint16_t(~Undef16) >> 8)) != ((Bits16 >> 8) & ~Undef16)) {
+    SplatBits = Bits16;
+    SplatUndef = Undef16;
+    SplatSize = 2;
+    return true;
+  }
+
+  // Otherwise, we have an 8-bit splat.
+  SplatBits  = uint8_t(Bits16)  | uint8_t(Bits16 >> 8);
+  SplatUndef = uint8_t(Undef16) & uint8_t(Undef16 >> 8);
+  SplatSize = 1;
+  return true;
+}