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
20namespace llvm {
21class CallInst;
22class Module;
23class DataLayout;
24
25class IntrinsicLowering {
26  const DataLayout &DL;
27
28  bool Warned;
29
30public:
31  explicit IntrinsicLowering(const DataLayout &DL) : DL(DL), Warned(false) {}
32
33  /// Replace a call to the specified intrinsic function.
34  /// If an intrinsic function must be implemented by the code generator
35  /// (such as va_start), this function should print a message and abort.
36  ///
37  /// Otherwise, if an intrinsic function call can be lowered, the code to
38  /// implement it (often a call to a non-intrinsic function) is inserted
39  /// _after_ the call instruction and the call is deleted. The caller must
40  /// be capable of handling this kind of change.
41  void LowerIntrinsicCall(CallInst *CI);
42
43  /// Try to replace a call instruction with a call to a bswap intrinsic. Return
44  /// false if the call is not a simple integer bswap.
45  static bool LowerToByteSwap(CallInst *CI);
46};
47}
48
49#endif
50