X86.h revision 36b56886974eae4f9c5ebc96befd3e7bfe5de338 
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/// createX86ISelDag - This pass converts a legalized DAG into a
28/// X86-specific DAG, ready for instruction scheduling.
29///
30FunctionPass *createX86ISelDag(X86TargetMachine &TM,
31                               CodeGenOpt::Level OptLevel);
32
33/// createGlobalBaseRegPass - This pass initializes a global base
34/// register for PIC on x86-32.
35FunctionPass* createGlobalBaseRegPass();
36
37/// createCleanupLocalDynamicTLSPass() - This pass combines multiple accesses
38/// to local-dynamic TLS variables so that the TLS base address for the module
39/// is only fetched once per execution path through the function.
40FunctionPass *createCleanupLocalDynamicTLSPass();
41
42/// createX86FloatingPointStackifierPass - This function returns a pass which
43/// converts floating point register references and pseudo instructions into
44/// floating point stack references and physical instructions.
45///
46FunctionPass *createX86FloatingPointStackifierPass();
47
48/// createX86IssueVZeroUpperPass - This pass inserts AVX vzeroupper instructions
49/// before each call to avoid transition penalty between functions encoded with
50/// AVX and SSE.
51FunctionPass *createX86IssueVZeroUpperPass();
52
53/// createX86CodeEmitterPass - Return a pass that emits the collected X86 code
54/// to the specified MCE object.
55FunctionPass *createX86JITCodeEmitterPass(X86TargetMachine &TM,
56                                          JITCodeEmitter &JCE);
57
58/// createX86EmitCodeToMemory - Returns a pass that converts a register
59/// allocated function into raw machine code in a dynamically
60/// allocated chunk of memory.
61///
62FunctionPass *createEmitX86CodeToMemory();
63
64/// \brief Creates an X86-specific Target Transformation Info pass.
65ImmutablePass *createX86TargetTransformInfoPass(const X86TargetMachine *TM);
66
67/// createX86PadShortFunctions - Return a pass that pads short functions
68/// with NOOPs. This will prevent a stall when returning on the Atom.
69FunctionPass *createX86PadShortFunctions();
70/// createX86FixupLEAs - Return a a pass that selectively replaces
71/// certain instructions (like add, sub, inc, dec, some shifts,
72/// and some multiplies) by equivalent LEA instructions, in order
73/// to eliminate execution delays in some Atom processors.
74FunctionPass *createX86FixupLEAs();
75
76} // End llvm namespace
77
78#endif
79