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   bool Warned;
30 
31 public:
IntrinsicLowering(const DataLayout & DL)32   explicit IntrinsicLowering(const DataLayout &DL) : DL(DL), Warned(false) {}
33 
34   /// AddPrototypes - This method, if called, causes all of the prototypes
35   /// that might be needed by an intrinsic lowering implementation to be
36   /// inserted into the module specified.
37   void AddPrototypes(Module &M);
38 
39   /// LowerIntrinsicCall - This method replaces a call with the LLVM function
40   /// which should be used to implement the specified intrinsic function call.
41   /// If an intrinsic function must be implemented by the code generator
42   /// (such as va_start), this function should print a message and abort.
43   ///
44   /// Otherwise, if an intrinsic function call can be lowered, the code to
45   /// implement it (often a call to a non-intrinsic function) is inserted
46   /// _after_ the call instruction and the call is deleted.  The caller must
47   /// be capable of handling this kind of change.
48   ///
49   void LowerIntrinsicCall(CallInst *CI);
50 
51   /// LowerToByteSwap - Replace a call instruction into a call to bswap
52   /// intrinsic. Return false if it has determined the call is not a
53   /// simple integer bswap.
54   static bool LowerToByteSwap(CallInst *CI);
55 };
56 }
57 
58 #endif
59