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 | |