LLVM  7.0.0svn
X86.h
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1 //===-- X86.h - Top-level interface for X86 representation ------*- C++ -*-===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file contains the entry points for global functions defined in the x86
11 // target library, as used by the LLVM JIT.
12 //
13 //===----------------------------------------------------------------------===//
14 
15 #ifndef LLVM_LIB_TARGET_X86_X86_H
16 #define LLVM_LIB_TARGET_X86_X86_H
17 
18 #include "llvm/Support/CodeGen.h"
19 
20 namespace llvm {
21 
22 class FunctionPass;
23 class ImmutablePass;
24 class InstructionSelector;
25 class ModulePass;
26 class PassRegistry;
27 class X86RegisterBankInfo;
28 class X86Subtarget;
29 class X86TargetMachine;
30 
31 /// This pass converts a legalized DAG into a X86-specific DAG, ready for
32 /// instruction scheduling.
33 FunctionPass *createX86ISelDag(X86TargetMachine &TM,
34  CodeGenOpt::Level OptLevel);
35 
36 /// This pass initializes a global base register for PIC on x86-32.
37 FunctionPass *createX86GlobalBaseRegPass();
38 
39 /// This pass combines multiple accesses to local-dynamic TLS variables so that
40 /// the TLS base address for the module is only fetched once per execution path
41 /// through the function.
42 FunctionPass *createCleanupLocalDynamicTLSPass();
43 
44 /// This function returns a pass which converts floating-point register
45 /// references and pseudo instructions into floating-point stack references and
46 /// physical instructions.
48 
49 /// This pass inserts AVX vzeroupper instructions before each call to avoid
50 /// transition penalty between functions encoded with AVX and SSE.
51 FunctionPass *createX86IssueVZeroUpperPass();
52 
53 /// This pass instruments the function prolog to save the return address to a
54 /// 'shadow call stack' and the function epilog to check that the return address
55 /// did not change during function execution.
56 FunctionPass *createShadowCallStackPass();
57 
58 /// This pass inserts ENDBR instructions before indirect jump/call
59 /// destinations as part of CET IBT mechanism.
61 
62 /// Return a pass that pads short functions with NOOPs.
63 /// This will prevent a stall when returning on the Atom.
64 FunctionPass *createX86PadShortFunctions();
65 
66 /// Return a pass that selectively replaces certain instructions (like add,
67 /// sub, inc, dec, some shifts, and some multiplies) by equivalent LEA
68 /// instructions, in order to eliminate execution delays in some processors.
69 FunctionPass *createX86FixupLEAs();
70 
71 /// Return a pass that removes redundant LEA instructions and redundant address
72 /// recalculations.
73 FunctionPass *createX86OptimizeLEAs();
74 
75 /// Return a pass that transforms setcc + movzx pairs into xor + setcc.
76 FunctionPass *createX86FixupSetCC();
77 
78 /// Return a pass that avoids creating store forward block issues in the hardware.
80 
81 /// Return a pass that lowers EFLAGS copy pseudo instructions.
82 FunctionPass *createX86FlagsCopyLoweringPass();
83 
84 /// Return a pass that expands WinAlloca pseudo-instructions.
85 FunctionPass *createX86WinAllocaExpander();
86 
87 /// Return a pass that optimizes the code-size of x86 call sequences. This is
88 /// done by replacing esp-relative movs with pushes.
89 FunctionPass *createX86CallFrameOptimization();
90 
91 /// Return an IR pass that inserts EH registration stack objects and explicit
92 /// EH state updates. This pass must run after EH preparation, which does
93 /// Windows-specific but architecture-neutral preparation.
94 FunctionPass *createX86WinEHStatePass();
95 
96 /// Return a Machine IR pass that expands X86-specific pseudo
97 /// instructions into a sequence of actual instructions. This pass
98 /// must run after prologue/epilogue insertion and before lowering
99 /// the MachineInstr to MC.
100 FunctionPass *createX86ExpandPseudoPass();
101 
102 /// This pass converts X86 cmov instructions into branch when profitable.
103 FunctionPass *createX86CmovConverterPass();
104 
105 /// Return a Machine IR pass that selectively replaces
106 /// certain byte and word instructions by equivalent 32 bit instructions,
107 /// in order to eliminate partial register usage, false dependences on
108 /// the upper portions of registers, and to save code size.
109 FunctionPass *createX86FixupBWInsts();
110 
111 /// Return a Machine IR pass that reassigns instruction chains from one domain
112 /// to another, when profitable.
113 FunctionPass *createX86DomainReassignmentPass();
114 
115 void initializeFixupBWInstPassPass(PassRegistry &);
116 
117 /// This pass replaces EVEX encoded of AVX-512 instructiosn by VEX
118 /// encoding when possible in order to reduce code size.
119 FunctionPass *createX86EvexToVexInsts();
120 
121 /// This pass creates the thunks for the retpoline feature.
122 FunctionPass *createX86RetpolineThunksPass();
123 
124 InstructionSelector *createX86InstructionSelector(const X86TargetMachine &TM,
125  X86Subtarget &,
126  X86RegisterBankInfo &);
127 
128 void initializeEvexToVexInstPassPass(PassRegistry &);
129 
131 
132 } // End llvm namespace
133 
134 #endif
FunctionPass * createX86OptimizeLEAs()
Return a pass that removes redundant LEA instructions and redundant address recalculations.
FunctionPass * createX86FixupBWInsts()
Return a Machine IR pass that selectively replaces certain byte and word instructions by equivalent 3...
Compute iterated dominance frontiers using a linear time algorithm.
Definition: AllocatorList.h:24
void initializeFixupBWInstPassPass(PassRegistry &)
FunctionPass * createX86FixupSetCC()
Return a pass that transforms setcc + movzx pairs into xor + setcc.
FunctionPass * createX86CallFrameOptimization()
Return a pass that optimizes the code-size of x86 call sequences.
FunctionPass * createX86IssueVZeroUpperPass()
This pass inserts AVX vzeroupper instructions before each call to avoid transition penalty between fu...
FunctionPass * createX86EvexToVexInsts()
This pass replaces EVEX encoded of AVX-512 instructiosn by VEX encoding when possible in order to red...
FunctionPass * createShadowCallStackPass()
This pass instruments the function prolog to save the return address to a 'shadow call stack' and the...
FunctionPass * createX86DomainReassignmentPass()
Return a Machine IR pass that reassigns instruction chains from one domain to another, when profitable.
FunctionPass * createX86PadShortFunctions()
Return a pass that pads short functions with NOOPs.
void initializeEvexToVexInstPassPass(PassRegistry &)
FunctionPass * createX86FixupLEAs()
Return a pass that selectively replaces certain instructions (like add, sub, inc, dec...
FunctionPass * createX86ExpandPseudoPass()
Return a Machine IR pass that expands X86-specific pseudo instructions into a sequence of actual inst...
FunctionPass * createX86GlobalBaseRegPass()
This pass initializes a global base register for PIC on x86-32.
FunctionPass * createX86CmovConverterPass()
This pass converts X86 cmov instructions into branch when profitable.
FunctionPass * createX86IndirectBranchTrackingPass()
This pass inserts ENDBR instructions before indirect jump/call destinations as part of CET IBT mechan...
FunctionPass * createX86FlagsCopyLoweringPass()
Return a pass that lowers EFLAGS copy pseudo instructions.
FunctionPass * createX86SpeculativeLoadHardeningPass()
InstructionSelector * createX86InstructionSelector(const X86TargetMachine &TM, X86Subtarget &, X86RegisterBankInfo &)
FunctionPass * createX86FloatingPointStackifierPass()
This function returns a pass which converts floating-point register references and pseudo instruction...
FunctionPass * createX86WinAllocaExpander()
Return a pass that expands WinAlloca pseudo-instructions.
FunctionPass * createX86ISelDag(X86TargetMachine &TM, CodeGenOpt::Level OptLevel)
This pass converts a legalized DAG into a X86-specific DAG, ready for instruction scheduling...
FunctionPass * createX86RetpolineThunksPass()
This pass creates the thunks for the retpoline feature.
FunctionPass * createX86AvoidStoreForwardingBlocks()
Return a pass that avoids creating store forward block issues in the hardware.
FunctionPass * createX86WinEHStatePass()
Return an IR pass that inserts EH registration stack objects and explicit EH state updates...
FunctionPass * createCleanupLocalDynamicTLSPass()
This pass combines multiple accesses to local-dynamic TLS variables so that the TLS base address for ...