LLVM  16.0.0git
LoongArchMatInt.cpp
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1 //===- LoongArchMatInt.cpp - Immediate materialisation ---------*- C++ -*--===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #include "LoongArchMatInt.h"
12 
13 using namespace llvm;
14 
16  // Val:
17  // | hi32 | lo32 |
18  // +-----------+------------------+------------------+-----------+
19  // | Highest12 | Higher20 | Hi20 | Lo12 |
20  // +-----------+------------------+------------------+-----------+
21  // 63 52 51 32 31 12 11 0
22  //
23  const int64_t Highest12 = Val >> 52 & 0xFFF;
24  const int64_t Higher20 = Val >> 32 & 0xFFFFF;
25  const int64_t Hi20 = Val >> 12 & 0xFFFFF;
26  const int64_t Lo12 = Val & 0xFFF;
27  InstSeq Insts;
28 
29  if (Highest12 != 0 && SignExtend64<52>(Val) == 0) {
30  Insts.push_back(Inst(LoongArch::LU52I_D, SignExtend64<12>(Highest12)));
31  return Insts;
32  }
33 
34  if (Hi20 == 0)
35  Insts.push_back(Inst(LoongArch::ORI, Lo12));
36  else if (SignExtend32<1>(Lo12 >> 11) == SignExtend32<20>(Hi20))
37  Insts.push_back(Inst(LoongArch::ADDI_W, SignExtend64<12>(Lo12)));
38  else {
39  Insts.push_back(Inst(LoongArch::LU12I_W, SignExtend64<20>(Hi20)));
40  if (Lo12 != 0)
41  Insts.push_back(Inst(LoongArch::ORI, Lo12));
42  }
43 
44  if (SignExtend32<1>(Hi20 >> 19) != SignExtend32<20>(Higher20))
45  Insts.push_back(Inst(LoongArch::LU32I_D, SignExtend64<20>(Higher20)));
46 
47  if (SignExtend32<1>(Higher20 >> 19) != SignExtend32<12>(Highest12))
48  Insts.push_back(Inst(LoongArch::LU52I_D, SignExtend64<12>(Highest12)));
49 
50  return Insts;
51 }
MathExtras.h
llvm
This is an optimization pass for GlobalISel generic memory operations.
Definition: AddressRanges.h:18
llvm::LoongArchMatInt::Inst
Definition: LoongArchMatInt.h:17
llvm::SmallVector
This is a 'vector' (really, a variable-sized array), optimized for the case when the array is small.
Definition: SmallVector.h:1199
llvm::LoongArchMatInt::generateInstSeq
InstSeq generateInstSeq(int64_t Val)
Definition: LoongArchMatInt.cpp:15
LoongArchMatInt.h
LoongArchMCTargetDesc.h