--- /dev/null
+//===-- llvm/CodeGen/IntrinsicLowering.h - Intrinsic 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 target-machines to support the new intrinsic.
+// Later, as desired, code generators 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.acos can be
+// implemented as a call to the math library 'acos' 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
+
+namespace llvm {
+ class CallInst;
+
+ struct IntrinsicLowering {
+
+ /// 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 LowerIntrinsicCall(CallInst *CI);
+ };
+}
+
+#endif
--- /dev/null
+//===-- llvm/CodeGen/IntrinsicLowering.h - Intrinsic 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 target-machines to support the new intrinsic.
+// Later, as desired, code generators 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.acos can be
+// implemented as a call to the math library 'acos' 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
+
+namespace llvm {
+ class CallInst;
+
+ struct IntrinsicLowering {
+
+ /// 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 LowerIntrinsicCall(CallInst *CI);
+ };
+}
+
+#endif