lib/Target/SPIRV/SPIRVISelLowering.cpp

//===- SPIRVISelLowering.cpp - SPIR-V DAG Lowering Impl ---------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements the SPIRVTargetLowering class.
//
//===----------------------------------------------------------------------===//

#include "SPIRVISelLowering.h"
#include "SPIRV.h"

#define DEBUG_TYPE "spirv-lower"

using namespace llvm;

unsigned SPIRVTargetLowering::getNumRegistersForCallingConv(
    LLVMContext &Context, CallingConv::ID CC, EVT VT) const {
  // This code avoids CallLowering fail inside getVectorTypeBreakdown
  // on v3i1 arguments. Maybe we need to return 1 for all types.
  // TODO: remove it once this case is supported by the default implementation.
  if (VT.isVector() && VT.getVectorNumElements() == 3 &&
      (VT.getVectorElementType() == MVT::i1 ||
       VT.getVectorElementType() == MVT::i8))
    return 1;
  return getNumRegisters(Context, VT);
}

MVT SPIRVTargetLowering::getRegisterTypeForCallingConv(LLVMContext &Context,
                                                       CallingConv::ID CC,
                                                       EVT VT) const {
  // This code avoids CallLowering fail inside getVectorTypeBreakdown
  // on v3i1 arguments. Maybe we need to return i32 for all types.
  // TODO: remove it once this case is supported by the default implementation.
  if (VT.isVector() && VT.getVectorNumElements() == 3) {
    if (VT.getVectorElementType() == MVT::i1)
      return MVT::v4i1;
    else if (VT.getVectorElementType() == MVT::i8)
      return MVT::v4i8;
  }
  return getRegisterType(Context, VT);
}