X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FCodeGen%2FIntrinsicLowering.h;h=5a3fb4b1a3dfb18275b1b2ee37ac9c2504b70f33;hb=412cd2f81374865dfa708bef6d5b896ca10dece0;hp=bd7bfac2e973c0851dd90e95064923403e7b8ce2;hpb=b13b3801fc48087ebcafb95e29ad79643234683f;p=oota-llvm.git

diff --git a/include/llvm/CodeGen/IntrinsicLowering.h b/include/llvm/CodeGen/IntrinsicLowering.h
index bd7bfac2e97..5a3fb4b1a3d 100644
--- a/include/llvm/CodeGen/IntrinsicLowering.h
+++ b/include/llvm/CodeGen/IntrinsicLowering.h
@@ -2,31 +2,14 @@
 //
 //                     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 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.
+// having to modify all of the C backend or interpreter.
 //
 //===----------------------------------------------------------------------===//
 
@@ -38,41 +21,38 @@
 namespace llvm {
   class CallInst;
   class Module;
+  class DataLayout;
 
   class IntrinsicLowering {
-  protected:
-    bool ShouldEmitDebugFunctions;
-  public:
-    IntrinsicLowering() : ShouldEmitDebugFunctions(false) {}
-    virtual ~IntrinsicLowering() {}
+    const DataLayout& TD;
 
-    bool EmitDebugFunctions() const { return ShouldEmitDebugFunctions; }
     
+    bool Warned;
+  public:
+    explicit IntrinsicLowering(const DataLayout &td) :
+      TD(td), Warned(false) {}
+
     /// 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
-    /// intrinsic function must be implemented by the code generator (such as
-    /// va_start), this function should print a message and abort.
+    /// LowerIntrinsicCall - This method replaces a call with 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;
-  };
+    void LowerIntrinsicCall(CallInst *CI);
 
-  /// 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);
+    /// LowerToByteSwap - Replace a call instruction into a call to bswap
+    /// intrinsic. Return false if it has determined the call is not a
+    /// simple integer bswap.
+    static bool LowerToByteSwap(CallInst *CI);
   };
 }