1 //===-- IntrinsicLowering.h - Intrinsic Function Lowering -------*- C++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This file defines the IntrinsicLowering interface. This interface allows 10 // addition of domain-specific or front-end specific intrinsics to LLVM without 11 // having to modify all of the C backend or interpreter. 12 // 13 //===----------------------------------------------------------------------===// 14 15 #ifndef LLVM_CODEGEN_INTRINSICLOWERING_H 16 #define LLVM_CODEGEN_INTRINSICLOWERING_H 17 18 namespace llvm { 19 class CallInst; 20 class DataLayout; 21 22 class IntrinsicLowering { 23 const DataLayout &DL; 24 25 bool Warned = false; 26 27 public: 28 explicit IntrinsicLowering(const DataLayout &DL) : DL(DL) {} 29 30 /// Replace a call to the specified intrinsic function. 31 /// If an intrinsic function must be implemented by the code generator 32 /// (such as va_start), this function should print a message and abort. 33 /// 34 /// Otherwise, if an intrinsic function call can be lowered, the code to 35 /// implement it (often a call to a non-intrinsic function) is inserted 36 /// _after_ the call instruction and the call is deleted. The caller must 37 /// be capable of handling this kind of change. 38 void LowerIntrinsicCall(CallInst *CI); 39 40 /// Try to replace a call instruction with a call to a bswap intrinsic. Return 41 /// false if the call is not a simple integer bswap. 42 static bool LowerToByteSwap(CallInst *CI); 43 }; 44 } 45 46 #endif 47