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: 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
