//
// 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.
+// having to modify all of the C backend or interpreter.
//
//===----------------------------------------------------------------------===//
class IntrinsicLowering {
public:
IntrinsicLowering() {}
- 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;
+ void AddPrototypes(Module &M);
/// LowerIntrinsicCall - This method returns the LLVM function which should
/// be used to implement the specified intrinsic function call. If an
/// _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);
+ void LowerIntrinsicCall(CallInst *CI);
};
}