Пример #1
0
bool CC_X86_64_VectorCall(unsigned &ValNo, MVT &ValVT, MVT &LocVT,
                          CCValAssign::LocInfo &LocInfo,
                          ISD::ArgFlagsTy &ArgFlags, CCState &State) {
  // On the second pass, go through the HVAs only.
  if (ArgFlags.isSecArgPass()) {
    if (ArgFlags.isHva())
      return CC_X86_VectorCallAssignRegister(ValNo, ValVT, LocVT, LocInfo,
                                             ArgFlags, State);
    return true;
  }

  // Process only vector types as defined by vectorcall spec:
  // "A vector type is either a floating-point type, for example,
  //  a float or double, or an SIMD vector type, for example, __m128 or __m256".
  if (!(ValVT.isFloatingPoint() ||
        (ValVT.isVector() && ValVT.getSizeInBits() >= 128))) {
    // If R9 was already assigned it means that we are after the fourth element
    // and because this is not an HVA / Vector type, we need to allocate
    // shadow XMM register.
    if (State.isAllocated(X86::R9)) {
      // Assign shadow XMM register.
      (void)State.AllocateReg(CC_X86_VectorCallGetSSEs(ValVT));
    }

    return false;
  }

  if (!ArgFlags.isHva() || ArgFlags.isHvaStart()) {
    // Assign shadow GPR register.
    (void)State.AllocateReg(CC_X86_64_VectorCallGetGPRs());

    // Assign XMM register - (shadow for HVA and non-shadow for non HVA).
    if (unsigned Reg = State.AllocateReg(CC_X86_VectorCallGetSSEs(ValVT))) {
      // In Vectorcall Calling convention, additional shadow stack can be
      // created on top of the basic 32 bytes of win64.
      // It can happen if the fifth or sixth argument is vector type or HVA.
      // At that case for each argument a shadow stack of 8 bytes is allocated.
      if (Reg == X86::XMM4 || Reg == X86::XMM5)
        State.AllocateStack(8, 8);

      if (!ArgFlags.isHva()) {
        State.addLoc(CCValAssign::getReg(ValNo, ValVT, Reg, LocVT, LocInfo));
        return true; // Allocated a register - Stop the search.
      }
    }
  }

  // If this is an HVA - Stop the search,
  // otherwise continue the search.
  return ArgFlags.isHva();
}
Пример #2
0
bool CC_X86_32_VectorCall(unsigned &ValNo, MVT &ValVT, MVT &LocVT,
                          CCValAssign::LocInfo &LocInfo,
                          ISD::ArgFlagsTy &ArgFlags, CCState &State) {
  // On the second pass, go through the HVAs only.
  if (ArgFlags.isSecArgPass()) {
    if (ArgFlags.isHva())
      return CC_X86_VectorCallAssignRegister(ValNo, ValVT, LocVT, LocInfo,
                                             ArgFlags, State);
    return true;
  }

  // Process only vector types as defined by vectorcall spec:
  // "A vector type is either a floating point type, for example,
  //  a float or double, or an SIMD vector type, for example, __m128 or __m256".
  if (!(ValVT.isFloatingPoint() ||
        (ValVT.isVector() && ValVT.getSizeInBits() >= 128))) {
    return false;
  }

  if (ArgFlags.isHva())
    return true; // If this is an HVA - Stop the search.

  // Assign XMM register.
  if (unsigned Reg = State.AllocateReg(CC_X86_VectorCallGetSSEs(ValVT))) {
    State.addLoc(CCValAssign::getReg(ValNo, ValVT, Reg, LocVT, LocInfo));
    return true;
  }

  // In case we did not find an available XMM register for a vector -
  // pass it indirectly.
  // It is similar to CCPassIndirect, with the addition of inreg.
  if (!ValVT.isFloatingPoint()) {
    LocVT = MVT::i32;
    LocInfo = CCValAssign::Indirect;
    ArgFlags.setInReg();
  }

  return false; // No register was assigned - Continue the search.
}