diff options
Diffstat (limited to 'lib/Target/X86/Utils/X86ShuffleDecode.cpp')
| -rw-r--r-- | lib/Target/X86/Utils/X86ShuffleDecode.cpp | 829 |
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
|