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 #include "llvm/IR/Intrinsics.h"
19 
20 namespace llvm {
21 class CallInst;
22 class DataLayout;
23 
24 class IntrinsicLowering {
25   const DataLayout &DL;
26 
27   bool Warned;
28 
29 public:
30   explicit IntrinsicLowering(const DataLayout &DL) : DL(DL), Warned(false) {}
31 
32   /// Replace a call to the specified intrinsic function.
33   /// If an intrinsic function must be implemented by the code generator
34   /// (such as va_start), this function should print a message and abort.
35   ///
36   /// Otherwise, if an intrinsic function call can be lowered, the code to
37   /// implement it (often a call to a non-intrinsic function) is inserted
38   /// _after_ the call instruction and the call is deleted. The caller must
39   /// be capable of handling this kind of change.
40   void LowerIntrinsicCall(CallInst *CI);
41 
42   /// Try to replace a call instruction with a call to a bswap intrinsic. Return
43   /// false if the call is not a simple integer bswap.
44   static bool LowerToByteSwap(CallInst *CI);
45 };
46 }
47 
48 #endif
49