1 //===-- IntrinsicLowering.h - Intrinsic Function Lowering -------*- 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 defines the IntrinsicLowering interface.  This interface allows
11 // addition of domain-specific or front-end specific intrinsics to LLVM without
12 // having to modify all of the C backend or interpreter.
13 //
14 //===----------------------------------------------------------------------===//
15 
16 #ifndef LLVM_CODEGEN_INTRINSICLOWERING_H
17 #define LLVM_CODEGEN_INTRINSICLOWERING_H
18 
19 #include "llvm/IR/Intrinsics.h"
20 
21 namespace llvm {
22   class CallInst;
23   class Module;
24   class DataLayout;
25 
26   class IntrinsicLowering {
27     const DataLayout& DL;
28 
29 
30     bool Warned;
31   public:
IntrinsicLowering(const DataLayout & DL)32     explicit IntrinsicLowering(const DataLayout &DL) :
33       DL(DL), Warned(false) {}
34 
35     /// AddPrototypes - This method, if called, causes all of the prototypes
36     /// that might be needed by an intrinsic lowering implementation to be
37     /// inserted into the module specified.
38     void AddPrototypes(Module &M);
39 
40     /// LowerIntrinsicCall - This method replaces a call with the LLVM function
41     /// which should be used to implement the specified intrinsic function call.
42     /// If an intrinsic function must be implemented by the code generator
43     /// (such as va_start), this function should print a message and abort.
44     ///
45     /// Otherwise, if an intrinsic function call can be lowered, the code to
46     /// implement it (often a call to a non-intrinsic function) is inserted
47     /// _after_ the call instruction and the call is deleted.  The caller must
48     /// be capable of handling this kind of change.
49     ///
50     void LowerIntrinsicCall(CallInst *CI);
51 
52     /// LowerToByteSwap - Replace a call instruction into a call to bswap
53     /// intrinsic. Return false if it has determined the call is not a
54     /// simple integer bswap.
55     static bool LowerToByteSwap(CallInst *CI);
56   };
57 }
58 
59 #endif
60