Method PExtrOp

FEXCore/Source/Interface/Core/OpcodeDispatcher/Vector.cpp:1627–1657

}

void OpDispatchBuilder::PExtrOp(OpcodeArgs, IR::OpSize ElementSize) {
  const auto DstSize = OpSizeFromDst(Op);

  Ref Src = LoadSource(FPRClass, Op, Op->Src[0], Op->Flags);
  uint64_t Index = Op->Src[1].Literal();

  // Fixup of 32-bit element size.
  // When the element size is 32-bit then it can be overriden as 64-bit because the encoding of PEXTRD/PEXTRQ
  // is the same except that REX.W or VEX.W is set to 1. Incredibly frustrating.
  // Use the destination size as the element size in this case.
  auto OverridenElementSize = ElementSize;
  if (ElementSize == OpSize::i32Bit) {
    OverridenElementSize = DstSize;
  }

  // AVX version only operates on 128-bit.
  const uint8_t NumElements = IR::NumElements(std::min(OpSizeFromSrc(Op), OpSize::i128Bit), OverridenElementSize);
  Index &= NumElements - 1;

  if (Op->Dest.IsGPR()) {
    const auto GPRSize = GetGPROpSize();
    // Extract already zero extends the result.
    Ref Result = _VExtractToGPR(OpSize::i128Bit, OverridenElementSize, Src, Index);
    StoreResult_WithOpSize(GPRClass, Op, Op->Dest, Result, GPRSize, OpSize::iInvalid);
    return;
  }

  // If we are storing to memory then we store the size of the element extracted
  Ref Dest = MakeSegmentAddress(Op, Op->Dest);
  _VStoreVectorElement(OpSize::i128Bit, OverridenElementSize, Src, Index, Dest);
}

void OpDispatchBuilder::VEXTRACT128Op(OpcodeArgs) {
  const auto DstIsXMM = Op->Dest.IsGPR();