mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-11-03 14:21:30 +00:00
ea61c35872
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21409 91177308-0d34-0410-b5e6-96231b3b80d8
75 lines
3.3 KiB
C++
75 lines
3.3 KiB
C++
//===-- IntrinsicLowering.h - Intrinsic Function Lowering -------*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file was developed by the LLVM research group and is distributed under
|
|
// the University of Illinois Open Source License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file defines the IntrinsicLowering interface. This interface allows
|
|
// addition of domain-specific or front-end specific intrinsics to LLVM without
|
|
// having to modify all of the code generators to support the new intrinsic.
|
|
// Later, as desired, targets can incrementally add support for particular
|
|
// intrinsic functions, as desired, to generate better code.
|
|
//
|
|
// If a code generator cannot handle or does not know about an intrinsic
|
|
// function, it will use the intrinsic lowering interface to change an intrinsic
|
|
// function name into a concrete function name which can be used to implement
|
|
// the functionality of the intrinsic. For example, llvm.memcpy can be
|
|
// implemented as a call to the math library 'memcpy' function if the target
|
|
// doesn't have hardware support for the intrinsic, or if it has not yet been
|
|
// implemented yet.
|
|
//
|
|
// Another use for this interface is the addition of domain-specific intrinsics.
|
|
// The default implementation of this interface would then lower the intrinsics
|
|
// to noop calls, allowing the direct execution of programs with instrumentation
|
|
// or other hooks placed in them. When a specific tool or flag is used, a
|
|
// different implementation of these interfaces may be used, which activates the
|
|
// intrinsics in some way.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_CODEGEN_INTRINSICLOWERING_H
|
|
#define LLVM_CODEGEN_INTRINSICLOWERING_H
|
|
|
|
#include "llvm/Intrinsics.h"
|
|
|
|
namespace llvm {
|
|
class CallInst;
|
|
class Module;
|
|
|
|
class IntrinsicLowering {
|
|
public:
|
|
virtual ~IntrinsicLowering() {}
|
|
|
|
/// AddPrototypes - This method, if called, causes all of the prototypes
|
|
/// that might be needed by an intrinsic lowering implementation to be
|
|
/// inserted into the module specified.
|
|
virtual void AddPrototypes(Module &M) = 0;
|
|
|
|
/// LowerIntrinsicCall - This method returns the LLVM function which should
|
|
/// be used to implement the specified intrinsic function call. If an
|
|
/// intrinsic function must be implemented by the code generator (such as
|
|
/// va_start), this function should print a message and abort.
|
|
///
|
|
/// Otherwise, if an intrinsic function call can be lowered, the code to
|
|
/// implement it (often a call to a non-intrinsic function) is inserted
|
|
/// _after_ the call instruction and the call is deleted. The caller must
|
|
/// be capable of handling this kind of change.
|
|
///
|
|
virtual void LowerIntrinsicCall(CallInst *CI) = 0;
|
|
};
|
|
|
|
/// DefaultIntrinsicLower - This is the default intrinsic lowering pass which
|
|
/// is used if no other one is specified. Custom intrinsic lowering
|
|
/// implementations should pass any unhandled intrinsics to this
|
|
/// implementation to allow for future extensibility.
|
|
struct DefaultIntrinsicLowering : public IntrinsicLowering {
|
|
virtual void AddPrototypes(Module &M);
|
|
virtual void LowerIntrinsicCall(CallInst *CI);
|
|
};
|
|
}
|
|
|
|
#endif
|