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/Intrinsics.h" 20 21 namespace llvm { 22 class CallInst; 23 class Module; 24 class TargetData; 25 26 class IntrinsicLowering { 27 const TargetData& TD; 28 29 30 bool Warned; 31 public: 32 explicit IntrinsicLowering(const TargetData &td) : 33 TD(td), 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
