1 //===-- IntrinsicLowering.h - Intrinsic Function Lowering -------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines the IntrinsicLowering interface. This interface allows
11 // addition of domain-specific or front-end specific intrinsics to LLVM without
12 // having to modify all of the C backend or interpreter.
14 //===----------------------------------------------------------------------===//
16 #ifndef LLVM_CODEGEN_INTRINSICLOWERING_H
17 #define LLVM_CODEGEN_INTRINSICLOWERING_H
19 #include "llvm/IR/Intrinsics.h"
26 class IntrinsicLowering {
32 explicit IntrinsicLowering(const DataLayout &DL) : DL(DL), Warned(false) {}
34 /// Add all of the prototypes that might be needed by an intrinsic lowering
35 /// implementation to be inserted into the module specified.
36 void AddPrototypes(Module &M);
38 /// Replace a call to the specified intrinsic function.
39 /// If an intrinsic function must be implemented by the code generator
40 /// (such as va_start), this function should print a message and abort.
42 /// Otherwise, if an intrinsic function call can be lowered, the code to
43 /// implement it (often a call to a non-intrinsic function) is inserted
44 /// _after_ the call instruction and the call is deleted. The caller must
45 /// be capable of handling this kind of change.
46 void LowerIntrinsicCall(CallInst *CI);
48 /// Try to replace a call instruction with a call to a bswap intrinsic. Return
49 /// false if the call is not a simple integer bswap.
50 static bool LowerToByteSwap(CallInst *CI);