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 X86TargetMachine;
25 
26 /// createX86ISelDag - This pass converts a legalized DAG into a
27 /// X86-specific DAG, ready for instruction scheduling.
28 ///
29 FunctionPass *createX86ISelDag(X86TargetMachine &TM,
30                                CodeGenOpt::Level OptLevel);
31 
32 /// createX86GlobalBaseRegPass - This pass initializes a global base
33 /// register for PIC on x86-32.
34 FunctionPass* createX86GlobalBaseRegPass();
35 
36 /// createCleanupLocalDynamicTLSPass() - This pass combines multiple accesses
37 /// to local-dynamic TLS variables so that the TLS base address for the module
38 /// is only fetched once per execution path through the function.
39 FunctionPass *createCleanupLocalDynamicTLSPass();
40 
41 /// createX86FloatingPointStackifierPass - This function returns a pass which
42 /// converts floating point register references and pseudo instructions into
43 /// floating point stack references and physical instructions.
44 ///
45 FunctionPass *createX86FloatingPointStackifierPass();
46 
47 /// createX86IssueVZeroUpperPass - This pass inserts AVX vzeroupper instructions
48 /// before each call to avoid transition penalty between functions encoded with
49 /// AVX and SSE.
50 FunctionPass *createX86IssueVZeroUpperPass();
51 
52 /// createX86EmitCodeToMemory - Returns a pass that converts a register
53 /// allocated function into raw machine code in a dynamically
54 /// allocated chunk of memory.
55 ///
56 FunctionPass *createEmitX86CodeToMemory();
57 
58 /// createX86PadShortFunctions - Return a pass that pads short functions
59 /// with NOOPs. This will prevent a stall when returning on the Atom.
60 FunctionPass *createX86PadShortFunctions();
61 /// createX86FixupLEAs - Return a a pass that selectively replaces
62 /// certain instructions (like add, sub, inc, dec, some shifts,
63 /// and some multiplies) by equivalent LEA instructions, in order
64 /// to eliminate execution delays in some Atom processors.
65 FunctionPass *createX86FixupLEAs();
66 
67 /// createX86CallFrameOptimization - Return a pass that optimizes
68 /// the code-size of x86 call sequences. This is done by replacing
69 /// esp-relative movs with pushes.
70 FunctionPass *createX86CallFrameOptimization();
71 
72 } // End llvm namespace
73 
74 #endif
75