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 TARGET_X86_H
16#define TARGET_X86_H
17
18#include "llvm/Support/CodeGen.h"
19
20namespace llvm {
21
22class FunctionPass;
23class ImmutablePass;
24class JITCodeEmitter;
25class X86TargetMachine;
26
27/// createX86AtomicExpandPass - This pass expands atomic operations that cannot
28/// be handled natively in terms of a loop using cmpxchg.
29FunctionPass *createX86AtomicExpandPass(const X86TargetMachine *TM);
30
31/// createX86ISelDag - This pass converts a legalized DAG into a
32/// X86-specific DAG, ready for instruction scheduling.
33///
34FunctionPass *createX86ISelDag(X86TargetMachine &TM,
35                               CodeGenOpt::Level OptLevel);
36
37/// createX86GlobalBaseRegPass - This pass initializes a global base
38/// register for PIC on x86-32.
39FunctionPass* createX86GlobalBaseRegPass();
40
41/// createCleanupLocalDynamicTLSPass() - This pass combines multiple accesses
42/// to local-dynamic TLS variables so that the TLS base address for the module
43/// is only fetched once per execution path through the function.
44FunctionPass *createCleanupLocalDynamicTLSPass();
45
46/// createX86FloatingPointStackifierPass - This function returns a pass which
47/// converts floating point register references and pseudo instructions into
48/// floating point stack references and physical instructions.
49///
50FunctionPass *createX86FloatingPointStackifierPass();
51
52/// createX86IssueVZeroUpperPass - This pass inserts AVX vzeroupper instructions
53/// before each call to avoid transition penalty between functions encoded with
54/// AVX and SSE.
55FunctionPass *createX86IssueVZeroUpperPass();
56
57/// createX86CodeEmitterPass - Return a pass that emits the collected X86 code
58/// to the specified MCE object.
59FunctionPass *createX86JITCodeEmitterPass(X86TargetMachine &TM,
60                                          JITCodeEmitter &JCE);
61
62/// createX86EmitCodeToMemory - Returns a pass that converts a register
63/// allocated function into raw machine code in a dynamically
64/// allocated chunk of memory.
65///
66FunctionPass *createEmitX86CodeToMemory();
67
68/// \brief Creates an X86-specific Target Transformation Info pass.
69ImmutablePass *createX86TargetTransformInfoPass(const X86TargetMachine *TM);
70
71/// createX86PadShortFunctions - Return a pass that pads short functions
72/// with NOOPs. This will prevent a stall when returning on the Atom.
73FunctionPass *createX86PadShortFunctions();
74/// createX86FixupLEAs - Return a a pass that selectively replaces
75/// certain instructions (like add, sub, inc, dec, some shifts,
76/// and some multiplies) by equivalent LEA instructions, in order
77/// to eliminate execution delays in some Atom processors.
78FunctionPass *createX86FixupLEAs();
79
80} // End llvm namespace
81
82#endif
83