LLVM 20.0.0git
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
13using 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}
void push_back(const T &Elt)
Definition: SmallVector.h:426
This is a 'vector' (really, a variable-sized array), optimized for the case when the array is small.
Definition: SmallVector.h:1209
InstSeq generateInstSeq(int64_t Val)
This is an optimization pass for GlobalISel generic memory operations.
Definition: AddressRanges.h:18