Merge "Update aosp/master LLVM for rebase to r230699."

1 files changed, 434 insertions, 395 deletions

diff --git a/lib/Target/X86/Utils/X86ShuffleDecode.cpp b/lib/Target/X86/Utils/X86ShuffleDecode.cpp
index ba6cbc8..a7101e4 100644
--- a/lib/Target/X86/Utils/X86ShuffleDecode.cpp
+++ b/lib/Target/X86/Utils/X86ShuffleDecode.cpp
@@ -1,395 +1,434 @@
-//===-- X86ShuffleDecode.cpp - X86 shuffle decode logic -------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// Define several functions to decode x86 specific shuffle semantics into a
-// generic vector mask.
-//
-//===----------------------------------------------------------------------===//
-
-#include "X86ShuffleDecode.h"
-#include "llvm/IR/Constants.h"
-#include "llvm/CodeGen/MachineValueType.h"
-
-//===----------------------------------------------------------------------===//
-//  Vector Mask Decoding
-//===----------------------------------------------------------------------===//
-
-namespace llvm {
-
-void DecodeINSERTPSMask(unsigned Imm, SmallVectorImpl<int> &ShuffleMask) {
-  // Defaults the copying the dest value.
-  ShuffleMask.push_back(0);
-  ShuffleMask.push_back(1);
-  ShuffleMask.push_back(2);
-  ShuffleMask.push_back(3);
-
-  // Decode the immediate.
-  unsigned ZMask = Imm & 15;
-  unsigned CountD = (Imm >> 4) & 3;
-  unsigned CountS = (Imm >> 6) & 3;
-
-  // CountS selects which input element to use.
-  unsigned InVal = 4+CountS;
-  // CountD specifies which element of destination to update.
-  ShuffleMask[CountD] = InVal;
-  // ZMask zaps values, potentially overriding the CountD elt.
-  if (ZMask & 1) ShuffleMask[0] = SM_SentinelZero;
-  if (ZMask & 2) ShuffleMask[1] = SM_SentinelZero;
-  if (ZMask & 4) ShuffleMask[2] = SM_SentinelZero;
-  if (ZMask & 8) ShuffleMask[3] = SM_SentinelZero;
-}
-
-// <3,1> or <6,7,2,3>
-void DecodeMOVHLPSMask(unsigned NElts, SmallVectorImpl<int> &ShuffleMask) {
-  for (unsigned i = NElts/2; i != NElts; ++i)
-    ShuffleMask.push_back(NElts+i);
-
-  for (unsigned i = NElts/2; i != NElts; ++i)
-    ShuffleMask.push_back(i);
-}
-
-// <0,2> or <0,1,4,5>
-void DecodeMOVLHPSMask(unsigned NElts, SmallVectorImpl<int> &ShuffleMask) {
-  for (unsigned i = 0; i != NElts/2; ++i)
-    ShuffleMask.push_back(i);
-
-  for (unsigned i = 0; i != NElts/2; ++i)
-    ShuffleMask.push_back(NElts+i);
-}
-
-void DecodeMOVSLDUPMask(MVT VT, SmallVectorImpl<int> &ShuffleMask) {
-  unsigned NumElts = VT.getVectorNumElements();
-  for (int i = 0, e = NumElts / 2; i < e; ++i) {
-    ShuffleMask.push_back(2 * i);
-    ShuffleMask.push_back(2 * i);
-  }
-}
-
-void DecodeMOVSHDUPMask(MVT VT, SmallVectorImpl<int> &ShuffleMask) {
-  unsigned NumElts = VT.getVectorNumElements();
-  for (int i = 0, e = NumElts / 2; i < e; ++i) {
-    ShuffleMask.push_back(2 * i + 1);
-    ShuffleMask.push_back(2 * i + 1);
-  }
-}
-
-void DecodePSLLDQMask(MVT VT, unsigned Imm, SmallVectorImpl<int> &ShuffleMask) {
-  unsigned VectorSizeInBits = VT.getSizeInBits();
-  unsigned NumElts = VectorSizeInBits / 8;
-  unsigned NumLanes = VectorSizeInBits / 128;
-  unsigned NumLaneElts = NumElts / NumLanes;
-
-  for (unsigned l = 0; l < NumElts; l += NumLaneElts)
-    for (unsigned i = 0; i < NumLaneElts; ++i) {
-      int M = SM_SentinelZero;
-      if (i >= Imm) M = i - Imm + l;
-      ShuffleMask.push_back(M);
-    }
-}
-
-void DecodePSRLDQMask(MVT VT, unsigned Imm, SmallVectorImpl<int> &ShuffleMask) {
-  unsigned VectorSizeInBits = VT.getSizeInBits();
-  unsigned NumElts = VectorSizeInBits / 8;
-  unsigned NumLanes = VectorSizeInBits / 128;
-  unsigned NumLaneElts = NumElts / NumLanes;
-
-  for (unsigned l = 0; l < NumElts; l += NumLaneElts)
-    for (unsigned i = 0; i < NumLaneElts; ++i) {
-      unsigned Base = i + Imm;
-      int M = Base + l;
-      if (Base >= NumLaneElts) M = SM_SentinelZero;
-      ShuffleMask.push_back(M);
-    }
-}
-
-void DecodePALIGNRMask(MVT VT, unsigned Imm,
-                       SmallVectorImpl<int> &ShuffleMask) {
-  unsigned NumElts = VT.getVectorNumElements();
-  unsigned Offset = Imm * (VT.getVectorElementType().getSizeInBits() / 8);
-
-  unsigned NumLanes = VT.getSizeInBits() / 128;
-  unsigned NumLaneElts = NumElts / NumLanes;
-
-  for (unsigned l = 0; l != NumElts; l += NumLaneElts) {
-    for (unsigned i = 0; i != NumLaneElts; ++i) {
-      unsigned Base = i + Offset;
-      // if i+offset is out of this lane then we actually need the other source
-      if (Base >= NumLaneElts) Base += NumElts - NumLaneElts;
-      ShuffleMask.push_back(Base + l);
-    }
-  }
-}
-
-/// DecodePSHUFMask - This decodes the shuffle masks for pshufd, and vpermilp*.
-/// VT indicates the type of the vector allowing it to handle different
-/// datatypes and vector widths.
-void DecodePSHUFMask(MVT VT, unsigned Imm, SmallVectorImpl<int> &ShuffleMask) {
-  unsigned NumElts = VT.getVectorNumElements();
-
-  unsigned NumLanes = VT.getSizeInBits() / 128;
-  unsigned NumLaneElts = NumElts / NumLanes;
-
-  unsigned NewImm = Imm;
-  for (unsigned l = 0; l != NumElts; l += NumLaneElts) {
-    for (unsigned i = 0; i != NumLaneElts; ++i) {
-      ShuffleMask.push_back(NewImm % NumLaneElts + l);
-      NewImm /= NumLaneElts;
-    }
-    if (NumLaneElts == 4) NewImm = Imm; // reload imm
-  }
-}
-
-void DecodePSHUFHWMask(MVT VT, unsigned Imm,
-                       SmallVectorImpl<int> &ShuffleMask) {
-  unsigned NumElts = VT.getVectorNumElements();
-
-  for (unsigned l = 0; l != NumElts; l += 8) {
-    unsigned NewImm = Imm;
-    for (unsigned i = 0, e = 4; i != e; ++i) {
-      ShuffleMask.push_back(l + i);
-    }
-    for (unsigned i = 4, e = 8; i != e; ++i) {
-      ShuffleMask.push_back(l + 4 + (NewImm & 3));
-      NewImm >>= 2;
-    }
-  }
-}
-
-void DecodePSHUFLWMask(MVT VT, unsigned Imm,
-                       SmallVectorImpl<int> &ShuffleMask) {
-  unsigned NumElts = VT.getVectorNumElements();
-
-  for (unsigned l = 0; l != NumElts; l += 8) {
-    unsigned NewImm = Imm;
-    for (unsigned i = 0, e = 4; i != e; ++i) {
-      ShuffleMask.push_back(l + (NewImm & 3));
-      NewImm >>= 2;
-    }
-    for (unsigned i = 4, e = 8; i != e; ++i) {
-      ShuffleMask.push_back(l + i);
-    }
-  }
-}
-
-/// DecodeSHUFPMask - This decodes the shuffle masks for shufp*. VT indicates
-/// the type of the vector allowing it to handle different datatypes and vector
-/// widths.
-void DecodeSHUFPMask(MVT VT, unsigned Imm, SmallVectorImpl<int> &ShuffleMask) {
-  unsigned NumElts = VT.getVectorNumElements();
-
-  unsigned NumLanes = VT.getSizeInBits() / 128;
-  unsigned NumLaneElts = NumElts / NumLanes;
-
-  unsigned NewImm = Imm;
-  for (unsigned l = 0; l != NumElts; l += NumLaneElts) {
-    // each half of a lane comes from different source
-    for (unsigned s = 0; s != NumElts*2; s += NumElts) {
-      for (unsigned i = 0; i != NumLaneElts/2; ++i) {
-        ShuffleMask.push_back(NewImm % NumLaneElts + s + l);
-        NewImm /= NumLaneElts;
-      }
-    }
-    if (NumLaneElts == 4) NewImm = Imm; // reload imm
-  }
-}
-
-/// DecodeUNPCKHMask - This decodes the shuffle masks for unpckhps/unpckhpd
-/// and punpckh*. VT indicates the type of the vector allowing it to handle
-/// different datatypes and vector widths.
-void DecodeUNPCKHMask(MVT VT, SmallVectorImpl<int> &ShuffleMask) {
-  unsigned NumElts = VT.getVectorNumElements();
-
-  // Handle 128 and 256-bit vector lengths. AVX defines UNPCK* to operate
-  // independently on 128-bit lanes.
-  unsigned NumLanes = VT.getSizeInBits() / 128;
-  if (NumLanes == 0 ) NumLanes = 1;  // Handle MMX
-  unsigned NumLaneElts = NumElts / NumLanes;
-
-  for (unsigned l = 0; l != NumElts; l += NumLaneElts) {
-    for (unsigned i = l + NumLaneElts/2, e = l + NumLaneElts; i != e; ++i) {
-      ShuffleMask.push_back(i);          // Reads from dest/src1
-      ShuffleMask.push_back(i+NumElts);  // Reads from src/src2
-    }
-  }
-}
-
-/// DecodeUNPCKLMask - This decodes the shuffle masks for unpcklps/unpcklpd
-/// and punpckl*. VT indicates the type of the vector allowing it to handle
-/// different datatypes and vector widths.
-void DecodeUNPCKLMask(MVT VT, SmallVectorImpl<int> &ShuffleMask) {
-  unsigned NumElts = VT.getVectorNumElements();
-
-  // Handle 128 and 256-bit vector lengths. AVX defines UNPCK* to operate
-  // independently on 128-bit lanes.
-  unsigned NumLanes = VT.getSizeInBits() / 128;
-  if (NumLanes == 0 ) NumLanes = 1;  // Handle MMX
-  unsigned NumLaneElts = NumElts / NumLanes;
-
-  for (unsigned l = 0; l != NumElts; l += NumLaneElts) {
-    for (unsigned i = l, e = l + NumLaneElts/2; i != e; ++i) {
-      ShuffleMask.push_back(i);          // Reads from dest/src1
-      ShuffleMask.push_back(i+NumElts);  // Reads from src/src2
-    }
-  }
-}
-
-void DecodeVPERM2X128Mask(MVT VT, unsigned Imm,
-                          SmallVectorImpl<int> &ShuffleMask) {
-  if (Imm & 0x88)
-    return; // Not a shuffle
-
-  unsigned HalfSize = VT.getVectorNumElements()/2;
-
-  for (unsigned l = 0; l != 2; ++l) {
-    unsigned HalfBegin = ((Imm >> (l*4)) & 0x3) * HalfSize;
-    for (unsigned i = HalfBegin, e = HalfBegin+HalfSize; i != e; ++i)
-      ShuffleMask.push_back(i);
-  }
-}
-
-void DecodePSHUFBMask(const Constant *C, SmallVectorImpl<int> &ShuffleMask) {
-  Type *MaskTy = C->getType();
-  assert(MaskTy->isVectorTy() && "Expected a vector constant mask!");
-  assert(MaskTy->getVectorElementType()->isIntegerTy(8) &&
-         "Expected i8 constant mask elements!");
-  int NumElements = MaskTy->getVectorNumElements();
-  // FIXME: Add support for AVX-512.
-  assert((NumElements == 16 || NumElements == 32) &&
-         "Only 128-bit and 256-bit vectors supported!");
-  ShuffleMask.reserve(NumElements);
-
-  if (auto *CDS = dyn_cast<ConstantDataSequential>(C)) {
-    assert((unsigned)NumElements == CDS->getNumElements() &&
-           "Constant mask has a different number of elements!");
-
-    for (int i = 0; i < NumElements; ++i) {
-      // For AVX vectors with 32 bytes the base of the shuffle is the 16-byte
-      // lane of the vector we're inside.
-      int Base = i < 16 ? 0 : 16;
-      uint64_t Element = CDS->getElementAsInteger(i);
-      // If the high bit (7) of the byte is set, the element is zeroed.
-      if (Element & (1 << 7))
-        ShuffleMask.push_back(SM_SentinelZero);
-      else {
-        // Only the least significant 4 bits of the byte are used.
-        int Index = Base + (Element & 0xf);
-        ShuffleMask.push_back(Index);
-      }
-    }
-  } else if (auto *CV = dyn_cast<ConstantVector>(C)) {
-    assert((unsigned)NumElements == CV->getNumOperands() &&
-           "Constant mask has a different number of elements!");
-
-    for (int i = 0; i < NumElements; ++i) {
-      // For AVX vectors with 32 bytes the base of the shuffle is the 16-byte
-      // lane of the vector we're inside.
-      int Base = i < 16 ? 0 : 16;
-      Constant *COp = CV->getOperand(i);
-      if (isa<UndefValue>(COp)) {
-        ShuffleMask.push_back(SM_SentinelUndef);
-        continue;
-      }
-      uint64_t Element = cast<ConstantInt>(COp)->getZExtValue();
-      // If the high bit (7) of the byte is set, the element is zeroed.
-      if (Element & (1 << 7))
-        ShuffleMask.push_back(SM_SentinelZero);
-      else {
-        // Only the least significant 4 bits of the byte are used.
-        int Index = Base + (Element & 0xf);
-        ShuffleMask.push_back(Index);
-      }
-    }
-  }
-}
-
-void DecodePSHUFBMask(ArrayRef<uint64_t> RawMask,
-                      SmallVectorImpl<int> &ShuffleMask) {
-  for (int i = 0, e = RawMask.size(); i < e; ++i) {
-    uint64_t M = RawMask[i];
-    if (M == (uint64_t)SM_SentinelUndef) {
-      ShuffleMask.push_back(M);
-      continue;
-    }
-    // For AVX vectors with 32 bytes the base of the shuffle is the half of
-    // the vector we're inside.
-    int Base = i < 16 ? 0 : 16;
-    // If the high bit (7) of the byte is set, the element is zeroed.
-    if (M & (1 << 7))
-      ShuffleMask.push_back(SM_SentinelZero);
-    else {
-      // Only the least significant 4 bits of the byte are used.
-      int Index = Base + (M & 0xf);
-      ShuffleMask.push_back(Index);
-    }
-  }
-}
-
-void DecodeBLENDMask(MVT VT, unsigned Imm, SmallVectorImpl<int> &ShuffleMask) {
-  int ElementBits = VT.getScalarSizeInBits();
-  int NumElements = VT.getVectorNumElements();
-  for (int i = 0; i < NumElements; ++i) {
-    // If there are more than 8 elements in the vector, then any immediate blend
-    // mask applies to each 128-bit lane. There can never be more than
-    // 8 elements in a 128-bit lane with an immediate blend.
-    int Bit = NumElements > 8 ? i % (128 / ElementBits) : i;
-    assert(Bit < 8 &&
-           "Immediate blends only operate over 8 elements at a time!");
-    ShuffleMask.push_back(((Imm >> Bit) & 1) ? NumElements + i : i);
-  }
-}
-
-/// DecodeVPERMMask - this decodes the shuffle masks for VPERMQ/VPERMPD.
-/// No VT provided since it only works on 256-bit, 4 element vectors.
-void DecodeVPERMMask(unsigned Imm, SmallVectorImpl<int> &ShuffleMask) {
-  for (unsigned i = 0; i != 4; ++i) {
-    ShuffleMask.push_back((Imm >> (2*i)) & 3);
-  }
-}
-
-void DecodeVPERMILPMask(const Constant *C, SmallVectorImpl<int> &ShuffleMask) {
-  Type *MaskTy = C->getType();
-  assert(MaskTy->isVectorTy() && "Expected a vector constant mask!");
-  assert(MaskTy->getVectorElementType()->isIntegerTy() &&
-         "Expected integer constant mask elements!");
-  int ElementBits = MaskTy->getScalarSizeInBits();
-  int NumElements = MaskTy->getVectorNumElements();
-  assert((NumElements == 2 || NumElements == 4 || NumElements == 8) &&
-         "Unexpected number of vector elements.");
-  ShuffleMask.reserve(NumElements);
-  if (auto *CDS = dyn_cast<ConstantDataSequential>(C)) {
-    assert((unsigned)NumElements == CDS->getNumElements() &&
-           "Constant mask has a different number of elements!");
-
-    for (int i = 0; i < NumElements; ++i) {
-      int Base = (i * ElementBits / 128) * (128 / ElementBits);
-      uint64_t Element = CDS->getElementAsInteger(i);
-      // Only the least significant 2 bits of the integer are used.
-      int Index = Base + (Element & 0x3);
-      ShuffleMask.push_back(Index);
-    }
-  } else if (auto *CV = dyn_cast<ConstantVector>(C)) {
-    assert((unsigned)NumElements == C->getNumOperands() &&
-           "Constant mask has a different number of elements!");
-
-    for (int i = 0; i < NumElements; ++i) {
-      int Base = (i * ElementBits / 128) * (128 / ElementBits);
-      Constant *COp = CV->getOperand(i);
-      if (isa<UndefValue>(COp)) {
-        ShuffleMask.push_back(SM_SentinelUndef);
-        continue;
-      }
-      uint64_t Element = cast<ConstantInt>(COp)->getZExtValue();
-      // Only the least significant 2 bits of the integer are used.
-      int Index = Base + (Element & 0x3);
-      ShuffleMask.push_back(Index);
-    }
-  }
-}
-
-} // llvm namespace
+//===-- X86ShuffleDecode.cpp - X86 shuffle decode logic -------------------===//

+//

+//                     The LLVM Compiler Infrastructure

+//

+// This file is distributed under the University of Illinois Open Source

+// License. See LICENSE.TXT for details.

+//

+//===----------------------------------------------------------------------===//

+//

+// Define several functions to decode x86 specific shuffle semantics into a

+// generic vector mask.

+//

+//===----------------------------------------------------------------------===//

+

+#include "X86ShuffleDecode.h"

+#include "llvm/IR/Constants.h"

+#include "llvm/CodeGen/MachineValueType.h"

+

+//===----------------------------------------------------------------------===//

+//  Vector Mask Decoding

+//===----------------------------------------------------------------------===//

+

+namespace llvm {

+

+void DecodeINSERTPSMask(unsigned Imm, SmallVectorImpl<int> &ShuffleMask) {

+  // Defaults the copying the dest value.

+  ShuffleMask.push_back(0);

+  ShuffleMask.push_back(1);

+  ShuffleMask.push_back(2);

+  ShuffleMask.push_back(3);

+

+  // Decode the immediate.

+  unsigned ZMask = Imm & 15;

+  unsigned CountD = (Imm >> 4) & 3;

+  unsigned CountS = (Imm >> 6) & 3;

+

+  // CountS selects which input element to use.

+  unsigned InVal = 4+CountS;

+  // CountD specifies which element of destination to update.

+  ShuffleMask[CountD] = InVal;

+  // ZMask zaps values, potentially overriding the CountD elt.

+  if (ZMask & 1) ShuffleMask[0] = SM_SentinelZero;

+  if (ZMask & 2) ShuffleMask[1] = SM_SentinelZero;

+  if (ZMask & 4) ShuffleMask[2] = SM_SentinelZero;

+  if (ZMask & 8) ShuffleMask[3] = SM_SentinelZero;

+}

+

+// <3,1> or <6,7,2,3>

+void DecodeMOVHLPSMask(unsigned NElts, SmallVectorImpl<int> &ShuffleMask) {

+  for (unsigned i = NElts/2; i != NElts; ++i)

+    ShuffleMask.push_back(NElts+i);

+

+  for (unsigned i = NElts/2; i != NElts; ++i)

+    ShuffleMask.push_back(i);

+}

+

+// <0,2> or <0,1,4,5>

+void DecodeMOVLHPSMask(unsigned NElts, SmallVectorImpl<int> &ShuffleMask) {

+  for (unsigned i = 0; i != NElts/2; ++i)

+    ShuffleMask.push_back(i);

+

+  for (unsigned i = 0; i != NElts/2; ++i)

+    ShuffleMask.push_back(NElts+i);

+}

+

+void DecodeMOVSLDUPMask(MVT VT, SmallVectorImpl<int> &ShuffleMask) {

+  unsigned NumElts = VT.getVectorNumElements();

+  for (int i = 0, e = NumElts / 2; i < e; ++i) {

+    ShuffleMask.push_back(2 * i);

+    ShuffleMask.push_back(2 * i);

+  }

+}

+

+void DecodeMOVSHDUPMask(MVT VT, SmallVectorImpl<int> &ShuffleMask) {

+  unsigned NumElts = VT.getVectorNumElements();

+  for (int i = 0, e = NumElts / 2; i < e; ++i) {

+    ShuffleMask.push_back(2 * i + 1);

+    ShuffleMask.push_back(2 * i + 1);

+  }

+}

+

+void DecodeMOVDDUPMask(MVT VT, SmallVectorImpl<int> &ShuffleMask) {

+  unsigned VectorSizeInBits = VT.getSizeInBits();

+  unsigned ScalarSizeInBits = VT.getScalarSizeInBits();

+  unsigned NumElts = VT.getVectorNumElements();

+  unsigned NumLanes = VectorSizeInBits / 128;

+  unsigned NumLaneElts = NumElts / NumLanes;

+  unsigned NumLaneSubElts = 64 / ScalarSizeInBits;

+

+  for (unsigned l = 0; l < NumElts; l += NumLaneElts)

+    for (unsigned i = 0; i < NumLaneElts; i += NumLaneSubElts)

+      for (unsigned s = 0; s != NumLaneSubElts; s++)

+        ShuffleMask.push_back(l + s);

+}

+

+void DecodePSLLDQMask(MVT VT, unsigned Imm, SmallVectorImpl<int> &ShuffleMask) {

+  unsigned VectorSizeInBits = VT.getSizeInBits();

+  unsigned NumElts = VectorSizeInBits / 8;

+  unsigned NumLanes = VectorSizeInBits / 128;

+  unsigned NumLaneElts = NumElts / NumLanes;

+

+  for (unsigned l = 0; l < NumElts; l += NumLaneElts)

+    for (unsigned i = 0; i < NumLaneElts; ++i) {

+      int M = SM_SentinelZero;

+      if (i >= Imm) M = i - Imm + l;

+      ShuffleMask.push_back(M);

+    }

+}

+

+void DecodePSRLDQMask(MVT VT, unsigned Imm, SmallVectorImpl<int> &ShuffleMask) {

+  unsigned VectorSizeInBits = VT.getSizeInBits();

+  unsigned NumElts = VectorSizeInBits / 8;

+  unsigned NumLanes = VectorSizeInBits / 128;

+  unsigned NumLaneElts = NumElts / NumLanes;

+

+  for (unsigned l = 0; l < NumElts; l += NumLaneElts)

+    for (unsigned i = 0; i < NumLaneElts; ++i) {

+      unsigned Base = i + Imm;

+      int M = Base + l;

+      if (Base >= NumLaneElts) M = SM_SentinelZero;

+      ShuffleMask.push_back(M);

+    }

+}

+

+void DecodePALIGNRMask(MVT VT, unsigned Imm,

+                       SmallVectorImpl<int> &ShuffleMask) {

+  unsigned NumElts = VT.getVectorNumElements();

+  unsigned Offset = Imm * (VT.getVectorElementType().getSizeInBits() / 8);

+

+  unsigned NumLanes = VT.getSizeInBits() / 128;

+  unsigned NumLaneElts = NumElts / NumLanes;

+

+  for (unsigned l = 0; l != NumElts; l += NumLaneElts) {

+    for (unsigned i = 0; i != NumLaneElts; ++i) {

+      unsigned Base = i + Offset;

+      // if i+offset is out of this lane then we actually need the other source

+      if (Base >= NumLaneElts) Base += NumElts - NumLaneElts;

+      ShuffleMask.push_back(Base + l);

+    }

+  }

+}

+

+/// DecodePSHUFMask - This decodes the shuffle masks for pshufd, and vpermilp*.

+/// VT indicates the type of the vector allowing it to handle different

+/// datatypes and vector widths.

+void DecodePSHUFMask(MVT VT, unsigned Imm, SmallVectorImpl<int> &ShuffleMask) {

+  unsigned NumElts = VT.getVectorNumElements();

+

+  unsigned NumLanes = VT.getSizeInBits() / 128;

+  unsigned NumLaneElts = NumElts / NumLanes;

+

+  unsigned NewImm = Imm;

+  for (unsigned l = 0; l != NumElts; l += NumLaneElts) {

+    for (unsigned i = 0; i != NumLaneElts; ++i) {

+      ShuffleMask.push_back(NewImm % NumLaneElts + l);

+      NewImm /= NumLaneElts;

+    }

+    if (NumLaneElts == 4) NewImm = Imm; // reload imm

+  }

+}

+

+void DecodePSHUFHWMask(MVT VT, unsigned Imm,

+                       SmallVectorImpl<int> &ShuffleMask) {

+  unsigned NumElts = VT.getVectorNumElements();

+

+  for (unsigned l = 0; l != NumElts; l += 8) {

+    unsigned NewImm = Imm;

+    for (unsigned i = 0, e = 4; i != e; ++i) {

+      ShuffleMask.push_back(l + i);

+    }

+    for (unsigned i = 4, e = 8; i != e; ++i) {

+      ShuffleMask.push_back(l + 4 + (NewImm & 3));

+      NewImm >>= 2;

+    }

+  }

+}

+

+void DecodePSHUFLWMask(MVT VT, unsigned Imm,

+                       SmallVectorImpl<int> &ShuffleMask) {

+  unsigned NumElts = VT.getVectorNumElements();

+

+  for (unsigned l = 0; l != NumElts; l += 8) {

+    unsigned NewImm = Imm;

+    for (unsigned i = 0, e = 4; i != e; ++i) {

+      ShuffleMask.push_back(l + (NewImm & 3));

+      NewImm >>= 2;

+    }

+    for (unsigned i = 4, e = 8; i != e; ++i) {

+      ShuffleMask.push_back(l + i);

+    }

+  }

+}

+

+/// DecodeSHUFPMask - This decodes the shuffle masks for shufp*. VT indicates

+/// the type of the vector allowing it to handle different datatypes and vector

+/// widths.

+void DecodeSHUFPMask(MVT VT, unsigned Imm, SmallVectorImpl<int> &ShuffleMask) {

+  unsigned NumElts = VT.getVectorNumElements();

+

+  unsigned NumLanes = VT.getSizeInBits() / 128;

+  unsigned NumLaneElts = NumElts / NumLanes;

+

+  unsigned NewImm = Imm;

+  for (unsigned l = 0; l != NumElts; l += NumLaneElts) {

+    // each half of a lane comes from different source

+    for (unsigned s = 0; s != NumElts*2; s += NumElts) {

+      for (unsigned i = 0; i != NumLaneElts/2; ++i) {

+        ShuffleMask.push_back(NewImm % NumLaneElts + s + l);

+        NewImm /= NumLaneElts;

+      }

+    }

+    if (NumLaneElts == 4) NewImm = Imm; // reload imm

+  }

+}

+

+/// DecodeUNPCKHMask - This decodes the shuffle masks for unpckhps/unpckhpd

+/// and punpckh*. VT indicates the type of the vector allowing it to handle

+/// different datatypes and vector widths.

+void DecodeUNPCKHMask(MVT VT, SmallVectorImpl<int> &ShuffleMask) {

+  unsigned NumElts = VT.getVectorNumElements();

+

+  // Handle 128 and 256-bit vector lengths. AVX defines UNPCK* to operate

+  // independently on 128-bit lanes.

+  unsigned NumLanes = VT.getSizeInBits() / 128;

+  if (NumLanes == 0 ) NumLanes = 1;  // Handle MMX

+  unsigned NumLaneElts = NumElts / NumLanes;

+

+  for (unsigned l = 0; l != NumElts; l += NumLaneElts) {

+    for (unsigned i = l + NumLaneElts/2, e = l + NumLaneElts; i != e; ++i) {

+      ShuffleMask.push_back(i);          // Reads from dest/src1

+      ShuffleMask.push_back(i+NumElts);  // Reads from src/src2

+    }

+  }

+}

+

+/// DecodeUNPCKLMask - This decodes the shuffle masks for unpcklps/unpcklpd

+/// and punpckl*. VT indicates the type of the vector allowing it to handle

+/// different datatypes and vector widths.

+void DecodeUNPCKLMask(MVT VT, SmallVectorImpl<int> &ShuffleMask) {

+  unsigned NumElts = VT.getVectorNumElements();

+

+  // Handle 128 and 256-bit vector lengths. AVX defines UNPCK* to operate

+  // independently on 128-bit lanes.

+  unsigned NumLanes = VT.getSizeInBits() / 128;

+  if (NumLanes == 0 ) NumLanes = 1;  // Handle MMX

+  unsigned NumLaneElts = NumElts / NumLanes;

+

+  for (unsigned l = 0; l != NumElts; l += NumLaneElts) {

+    for (unsigned i = l, e = l + NumLaneElts/2; i != e; ++i) {

+      ShuffleMask.push_back(i);          // Reads from dest/src1

+      ShuffleMask.push_back(i+NumElts);  // Reads from src/src2

+    }

+  }

+}

+

+void DecodeVPERM2X128Mask(MVT VT, unsigned Imm,

+                          SmallVectorImpl<int> &ShuffleMask) {

+  if (Imm & 0x88)

+    return; // Not a shuffle

+

+  unsigned HalfSize = VT.getVectorNumElements()/2;

+

+  for (unsigned l = 0; l != 2; ++l) {

+    unsigned HalfBegin = ((Imm >> (l*4)) & 0x3) * HalfSize;

+    for (unsigned i = HalfBegin, e = HalfBegin+HalfSize; i != e; ++i)

+      ShuffleMask.push_back(i);

+  }

+}

+

+void DecodePSHUFBMask(const Constant *C, SmallVectorImpl<int> &ShuffleMask) {

+  Type *MaskTy = C->getType();

+  // It is not an error for the PSHUFB mask to not be a vector of i8 because the

+  // constant pool uniques constants by their bit representation.

+  // e.g. the following take up the same space in the constant pool:

+  //   i128 -170141183420855150465331762880109871104

+  //

+  //   <2 x i64> <i64 -9223372034707292160, i64 -9223372034707292160>

+  //

+  //   <4 x i32> <i32 -2147483648, i32 -2147483648,

+  //              i32 -2147483648, i32 -2147483648>

+

+  unsigned MaskTySize = MaskTy->getPrimitiveSizeInBits();

+

+  if (MaskTySize != 128 && MaskTySize != 256) // FIXME: Add support for AVX-512.

+    return;

+

+  // This is a straightforward byte vector.

+  if (MaskTy->isVectorTy() && MaskTy->getVectorElementType()->isIntegerTy(8)) {

+    int NumElements = MaskTy->getVectorNumElements();

+    ShuffleMask.reserve(NumElements);

+

+    for (int i = 0; i < NumElements; ++i) {

+      // For AVX vectors with 32 bytes the base of the shuffle is the 16-byte

+      // lane of the vector we're inside.

+      int Base = i < 16 ? 0 : 16;

+      Constant *COp = C->getAggregateElement(i);

+      if (!COp) {

+        ShuffleMask.clear();

+        return;

+      } else if (isa<UndefValue>(COp)) {

+        ShuffleMask.push_back(SM_SentinelUndef);

+        continue;

+      }

+      uint64_t Element = cast<ConstantInt>(COp)->getZExtValue();

+      // If the high bit (7) of the byte is set, the element is zeroed.

+      if (Element & (1 << 7))

+        ShuffleMask.push_back(SM_SentinelZero);

+      else {

+        // Only the least significant 4 bits of the byte are used.

+        int Index = Base + (Element & 0xf);

+        ShuffleMask.push_back(Index);

+      }

+    }

+  }

+  // TODO: Handle funny-looking vectors too.

+}

+

+void DecodePSHUFBMask(ArrayRef<uint64_t> RawMask,

+                      SmallVectorImpl<int> &ShuffleMask) {

+  for (int i = 0, e = RawMask.size(); i < e; ++i) {

+    uint64_t M = RawMask[i];

+    if (M == (uint64_t)SM_SentinelUndef) {

+      ShuffleMask.push_back(M);

+      continue;

+    }

+    // For AVX vectors with 32 bytes the base of the shuffle is the half of

+    // the vector we're inside.

+    int Base = i < 16 ? 0 : 16;

+    // If the high bit (7) of the byte is set, the element is zeroed.

+    if (M & (1 << 7))

+      ShuffleMask.push_back(SM_SentinelZero);

+    else {

+      // Only the least significant 4 bits of the byte are used.

+      int Index = Base + (M & 0xf);

+      ShuffleMask.push_back(Index);

+    }

+  }

+}

+

+void DecodeBLENDMask(MVT VT, unsigned Imm, SmallVectorImpl<int> &ShuffleMask) {

+  int ElementBits = VT.getScalarSizeInBits();

+  int NumElements = VT.getVectorNumElements();

+  for (int i = 0; i < NumElements; ++i) {

+    // If there are more than 8 elements in the vector, then any immediate blend

+    // mask applies to each 128-bit lane. There can never be more than

+    // 8 elements in a 128-bit lane with an immediate blend.

+    int Bit = NumElements > 8 ? i % (128 / ElementBits) : i;

+    assert(Bit < 8 &&

+           "Immediate blends only operate over 8 elements at a time!");

+    ShuffleMask.push_back(((Imm >> Bit) & 1) ? NumElements + i : i);

+  }

+}

+

+/// DecodeVPERMMask - this decodes the shuffle masks for VPERMQ/VPERMPD.

+/// No VT provided since it only works on 256-bit, 4 element vectors.

+void DecodeVPERMMask(unsigned Imm, SmallVectorImpl<int> &ShuffleMask) {

+  for (unsigned i = 0; i != 4; ++i) {

+    ShuffleMask.push_back((Imm >> (2*i)) & 3);

+  }

+}

+

+void DecodeVPERMILPMask(const Constant *C, SmallVectorImpl<int> &ShuffleMask) {

+  Type *MaskTy = C->getType();

+  assert(MaskTy->isVectorTy() && "Expected a vector constant mask!");

+  assert(MaskTy->getVectorElementType()->isIntegerTy() &&

+         "Expected integer constant mask elements!");

+  int ElementBits = MaskTy->getScalarSizeInBits();

+  int NumElements = MaskTy->getVectorNumElements();

+  assert((NumElements == 2 || NumElements == 4 || NumElements == 8) &&

+         "Unexpected number of vector elements.");

+  ShuffleMask.reserve(NumElements);

+  if (auto *CDS = dyn_cast<ConstantDataSequential>(C)) {

+    assert((unsigned)NumElements == CDS->getNumElements() &&

+           "Constant mask has a different number of elements!");

+

+    for (int i = 0; i < NumElements; ++i) {

+      int Base = (i * ElementBits / 128) * (128 / ElementBits);

+      uint64_t Element = CDS->getElementAsInteger(i);

+      // Only the least significant 2 bits of the integer are used.

+      int Index = Base + (Element & 0x3);

+      ShuffleMask.push_back(Index);

+    }

+  } else if (auto *CV = dyn_cast<ConstantVector>(C)) {

+    assert((unsigned)NumElements == C->getNumOperands() &&

+           "Constant mask has a different number of elements!");

+

+    for (int i = 0; i < NumElements; ++i) {

+      int Base = (i * ElementBits / 128) * (128 / ElementBits);

+      Constant *COp = CV->getOperand(i);

+      if (isa<UndefValue>(COp)) {

+        ShuffleMask.push_back(SM_SentinelUndef);

+        continue;

+      }

+      uint64_t Element = cast<ConstantInt>(COp)->getZExtValue();

+      // Only the least significant 2 bits of the integer are used.

+      int Index = Base + (Element & 0x3);

+      ShuffleMask.push_back(Index);

+    }

+  }

+}

+

+void DecodeZeroExtendMask(MVT SrcVT, MVT DstVT, SmallVectorImpl<int> &Mask) {

+  unsigned NumDstElts = DstVT.getVectorNumElements();

+  unsigned SrcScalarBits = SrcVT.getScalarSizeInBits();

+  unsigned DstScalarBits = DstVT.getScalarSizeInBits();

+  unsigned Scale = DstScalarBits / SrcScalarBits;

+  assert(SrcScalarBits < DstScalarBits &&

+         "Expected zero extension mask to increase scalar size");

+  assert(SrcVT.getVectorNumElements() >= NumDstElts &&

+         "Too many zero extension lanes");

+

+  for (unsigned i = 0; i != NumDstElts; i++) {

+    Mask.push_back(i);

+    for (unsigned j = 1; j != Scale; j++)

+      Mask.push_back(SM_SentinelZero);

+  }

+}

+

+void DecodeZeroMoveLowMask(MVT VT, SmallVectorImpl<int> &ShuffleMask) {

+  unsigned NumElts = VT.getVectorNumElements();

+  ShuffleMask.push_back(0);

+  for (unsigned i = 1; i < NumElts; i++)

+    ShuffleMask.push_back(SM_SentinelZero);

+}

+

+void DecodeScalarMoveMask(MVT VT, bool IsLoad, SmallVectorImpl<int> &Mask) {

+  // First element comes from the first element of second source.

+  // Remaining elements: Load zero extends / Move copies from first source.

+  unsigned NumElts = VT.getVectorNumElements();

+  Mask.push_back(NumElts);

+  for (unsigned i = 1; i < NumElts; i++)

+    Mask.push_back(IsLoad ? static_cast<int>(SM_SentinelZero) : i);

+}

+} // llvm namespace