LLVM: lib/Target/X86/X86InsertWait.cpp Source File (original) (raw)
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33using namespace llvm;
34
35#define DEBUG_TYPE "x86-insert-wait"
36
37namespace {
38
40public:
41 static char ID;
42
44
46
47 StringRef getPassName() const override {
48 return "X86 insert wait instruction";
49 }
50};
51
52}
53
54char WaitInsert::ID = 0;
55
57
59 switch (MI.getOpcode()) {
60 case X86::FNINIT:
61 case X86::FLDCW16m:
62 case X86::FNSTCW16m:
63 case X86::FNSTSW16r:
64 case X86::FNSTSWm:
65 case X86::FNCLEX:
66 case X86::FLDENVm:
67 case X86::FSTENVm:
68 case X86::FRSTORm:
69 case X86::FSAVEm:
70 case X86::FINCSTP:
71 case X86::FDECSTP:
72 case X86::FFREE:
73 case X86::FFREEP:
74 case X86::FNOP:
75 case X86::WAIT:
76 return true;
77 default:
78 return false;
79 }
80}
81
83
84 switch (MI.getOpcode()) {
85 case X86::FNINIT:
86 case X86::FNSTSW16r:
87 case X86::FNSTSWm:
88 case X86::FNSTCW16m:
89 case X86::FNCLEX:
90 return true;
91 default:
92 return false;
93 }
94}
95
96bool WaitInsert::runOnMachineFunction(MachineFunction &MF) {
98 return false;
99
100 const X86Subtarget &ST = MF.getSubtarget();
101 const X86InstrInfo *TII = ST.getInstrInfo();
103
104 for (MachineBasicBlock &MBB : MF) {
106
108 continue;
109
110
111
112 if (!(MI->mayRaiseFPException() || MI->mayLoadOrStore()) ||
114 continue;
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116
120 continue;
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122 BuildMI(MBB, AfterMI, MI->getDebugLoc(), TII->get(X86::WAIT));
124
125 ++MI;
127 }
128 }
130}
const HexagonInstrInfo * TII
static bool isX87ControlInstruction(MachineInstr &MI)
Definition X86InsertWait.cpp:58
static bool isX87NonWaitingControlInstruction(MachineInstr &MI)
Definition X86InsertWait.cpp:82
FunctionPass class - This class is used to implement most global optimizations.
bool hasFnAttribute(Attribute::AttrKind Kind) const
Return true if the function has the attribute.
MachineInstrBundleIterator< MachineInstr > iterator
MachineFunctionPass - This class adapts the FunctionPass interface to allow convenient creation of pa...
const TargetSubtargetInfo & getSubtarget() const
getSubtarget - Return the subtarget for which this machine code is being compiled.
Function & getFunction()
Return the LLVM function that this machine code represents.
Representation of each machine instruction.
StringRef - Represent a constant reference to a string, i.e.
unsigned ID
LLVM IR allows to use arbitrary numbers as calling convention identifiers.
bool isX87Instruction(MachineInstr &MI)
Check if the instruction is X87 instruction.
This is an optimization pass for GlobalISel generic memory operations.
MachineInstrBuilder BuildMI(MachineFunction &MF, const MIMetadata &MIMD, const MCInstrDesc &MCID)
Builder interface. Specify how to create the initial instruction itself.
FunctionPass * createX86InsertX87waitPass()
This pass insert wait instruction after X87 instructions which could raise fp exceptions when strict-...
Definition X86InsertWait.cpp:56
LLVM_ABI raw_ostream & dbgs()
dbgs() - This returns a reference to a raw_ostream for debugging messages.