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67 lines
3.0 KiB
C++
67 lines
3.0 KiB
C++
//===-- llvm/IntrinsicLowering.h - Intrinsic Function Lowering --*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the IntrinsicLowering interface. This interface allows
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// addition of domain-specific or front-end specific intrinsics to LLVM without
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// having to modify all of the target-machines to support the new intrinsic.
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// Later, as desired, code generators can incrementally add support for
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// particular intrinsic functions, as desired, to generate better code.
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//
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// If a code generator cannot handle or does not know about an intrinsic
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// function, it will use the intrinsic lowering interface to change an intrinsic
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// function name into a concrete function name which can be used to implement
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// the functionality of the intrinsic. For example, llvm.acos can be
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// implemented as a call to the math library 'acos' function if the target
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// doesn't have hardware support for the intrinsic, or if it has not yet been
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// implemented yet.
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//
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// Another use for this interface is the addition of domain-specific intrinsics.
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// The default implementation of this interface would then lower the intrinsics
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// to noop calls, allowing the direct execution of programs with instrumentation
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// or other hooks placed in them. When a specific tool or flag is used, a
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// different implementation of these interfaces may be used, which activates the
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// intrinsics in some way.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_INTRINSICLOWERING_H
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#define LLVM_INTRINSICLOWERING_H
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#include "llvm/Intrinsics.h"
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namespace llvm {
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class CallInst;
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struct IntrinsicLowering {
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virtual ~IntrinsicLowering() {}
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/// LowerIntrinsicCall - This method returns the LLVM function which should
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/// be used to implement the specified intrinsic function call. If an
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/// intrinsic function must be implemented by the code generator (such as
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/// va_start), this function should print a message and abort.
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///
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/// Otherwise, if an intrinsic function call can be lowered, the code to
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/// implement it (often a call to a non-intrinsic function) is inserted
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/// _after_ the call instruction and the call is deleted. The caller must
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/// be capable of handling this kind of change.
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///
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virtual void LowerIntrinsicCall(CallInst *CI) = 0;
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};
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/// DefaultIntrinsicLower - This is the default intrinsic lowering pass which
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/// is used if no other one is specified. Custom intrinsic lowering
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/// implementations should pass any unhandled intrinsics to this
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/// implementation to allow for future extensibility.
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struct DefaultIntrinsicLowering : public IntrinsicLowering {
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virtual void LowerIntrinsicCall(CallInst *CI);
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};
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}
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#endif
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