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 /// Add all of the prototypes that might be needed by an intrinsic lowering 35 /// implementation to be inserted into the module specified. 36 void AddPrototypes(Module &M); 37 38 /// Replace a call to the specified intrinsic function. 39 /// If an intrinsic function must be implemented by the code generator 40 /// (such as va_start), this function should print a message and abort. 41 /// 42 /// Otherwise, if an intrinsic function call can be lowered, the code to 43 /// implement it (often a call to a non-intrinsic function) is inserted 44 /// _after_ the call instruction and the call is deleted. The caller must 45 /// be capable of handling this kind of change. 46 void LowerIntrinsicCall(CallInst *CI); 47 48 /// Try to replace a call instruction with a call to a bswap intrinsic. Return 49 /// false if the call is not a simple integer bswap. 50 static bool LowerToByteSwap(CallInst *CI); 51 }; 52 } 53 54 #endif 55