Mercurial > hg > CbC > CbC_llvm

comparison llvm/lib/Target/Hexagon/HexagonSplitConst32AndConst64.cpp @ 150:1d019706d866

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
LLVM10
author anatofuz
date Thu, 13 Feb 2020 15:10:13 +0900
parents
children c4bab56944e8
comparison
equal deleted inserted replaced
147:c2174574ed3a 150:1d019706d866
1 //=== HexagonSplitConst32AndConst64.cpp - split CONST32/Const64 into HI/LO ===//
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 // When the compiler is invoked with no small data, for instance, with the -G0
10 // command line option, then all CONST* opcodes should be broken down into
11 // appropriate LO and HI instructions. This splitting is done by this pass.
12 // The only reason this is not done in the DAG lowering itself is that there
13 // is no simple way of getting the register allocator to allot the same hard
14 // register to the result of LO and HI instructions. This pass is always
15 // scheduled after register allocation.
16 //
17 //===----------------------------------------------------------------------===//
18
19 #include "HexagonSubtarget.h"
20 #include "HexagonTargetMachine.h"
21 #include "HexagonTargetObjectFile.h"
22 #include "llvm/CodeGen/MachineFunctionPass.h"
23 #include "llvm/CodeGen/MachineInstrBuilder.h"
24 #include "llvm/CodeGen/Passes.h"
25 #include "llvm/CodeGen/TargetInstrInfo.h"
26 #include "llvm/CodeGen/TargetRegisterInfo.h"
27
28 using namespace llvm;
29
30 #define DEBUG_TYPE "xfer"
31
32 namespace llvm {
33 FunctionPass *createHexagonSplitConst32AndConst64();
34 void initializeHexagonSplitConst32AndConst64Pass(PassRegistry&);
35 }
36
37 namespace {
38 class HexagonSplitConst32AndConst64 : public MachineFunctionPass {
39 public:
40 static char ID;
41 HexagonSplitConst32AndConst64() : MachineFunctionPass(ID) {
42 PassRegistry &R = *PassRegistry::getPassRegistry();
43 initializeHexagonSplitConst32AndConst64Pass(R);
44 }
45 StringRef getPassName() const override {
46 return "Hexagon Split Const32s and Const64s";
47 }
48 bool runOnMachineFunction(MachineFunction &Fn) override;
49 MachineFunctionProperties getRequiredProperties() const override {
50 return MachineFunctionProperties().set(
51 MachineFunctionProperties::Property::NoVRegs);
52 }
53 };
54 }
55
56 char HexagonSplitConst32AndConst64::ID = 0;
57
58 INITIALIZE_PASS(HexagonSplitConst32AndConst64, "split-const-for-sdata",
59 "Hexagon Split Const32s and Const64s", false, false)
60
61 bool HexagonSplitConst32AndConst64::runOnMachineFunction(MachineFunction &Fn) {
62 auto &HST = Fn.getSubtarget<HexagonSubtarget>();
63 auto &HTM = static_cast<const HexagonTargetMachine&>(Fn.getTarget());
64 auto &TLOF = *HTM.getObjFileLowering();
65 if (HST.useSmallData() && TLOF.isSmallDataEnabled(HTM))
66 return false;
67
68 const TargetInstrInfo *TII = HST.getInstrInfo();
69 const TargetRegisterInfo *TRI = HST.getRegisterInfo();
70
71 // Loop over all of the basic blocks
72 for (MachineBasicBlock &B : Fn) {
73 for (auto I = B.begin(), E = B.end(); I != E; ) {
74 MachineInstr &MI = *I;
75 ++I;
76 unsigned Opc = MI.getOpcode();
77
78 if (Opc == Hexagon::CONST32) {
79 Register DestReg = MI.getOperand(0).getReg();
80 uint64_t ImmValue = MI.getOperand(1).getImm();
81 const DebugLoc &DL = MI.getDebugLoc();
82 BuildMI(B, MI, DL, TII->get(Hexagon::A2_tfrsi), DestReg)
83 .addImm(ImmValue);
84 B.erase(&MI);
85 } else if (Opc == Hexagon::CONST64) {
86 Register DestReg = MI.getOperand(0).getReg();
87 int64_t ImmValue = MI.getOperand(1).getImm();
88 const DebugLoc &DL = MI.getDebugLoc();
89 Register DestLo = TRI->getSubReg(DestReg, Hexagon::isub_lo);
90 Register DestHi = TRI->getSubReg(DestReg, Hexagon::isub_hi);
91
92 int32_t LowWord = (ImmValue & 0xFFFFFFFF);
93 int32_t HighWord = (ImmValue >> 32) & 0xFFFFFFFF;
94
95 BuildMI(B, MI, DL, TII->get(Hexagon::A2_tfrsi), DestLo)
96 .addImm(LowWord);
97 BuildMI(B, MI, DL, TII->get(Hexagon::A2_tfrsi), DestHi)
98 .addImm(HighWord);
99 B.erase(&MI);
100 }
101 }
102 }
103
104 return true;
105 }
106
107
108 //===----------------------------------------------------------------------===//
109 // Public Constructor Functions
110 //===----------------------------------------------------------------------===//
111 FunctionPass *llvm::createHexagonSplitConst32AndConst64() {
112 return new HexagonSplitConst32AndConst64();
113 }