include/llvm/CodeGen/IntrinsicLowering.h

   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 Module;
  23 class DataLayout;
  24
  25 class IntrinsicLowering {
  26   const DataLayout &DL;
  27
  28   bool Warned;
  29
  30 public:
  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