1 //===-- IntrinsicLowering.h - Intrinsic Function Lowering -------*- C++ -*-===//
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
7 //===----------------------------------------------------------------------===//
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.
13 //===----------------------------------------------------------------------===//
15 #ifndef LLVM_CODEGEN_INTRINSICLOWERING_H
16 #define LLVM_CODEGEN_INTRINSICLOWERING_H
18 #include "llvm/IR/Intrinsics.h"
24 class IntrinsicLowering {
30 explicit IntrinsicLowering(const DataLayout &DL) : DL(DL), Warned(false) {}
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.
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);
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);