From fea17a9901aac9c1fdd24afa6eadc01cf629f47e Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Mon, 13 Mar 2006 23:08:44 +0000
Subject: [PATCH] emit a mapping from LLVM intrinsic -> GCC builtins.

llvm-svn: 26736
---
 llvm/utils/TableGen/CodeGenIntrinsics.h  |  3 ++-
 llvm/utils/TableGen/IntrinsicEmitter.cpp | 33 +++++++++++++++++++-----
 llvm/utils/TableGen/IntrinsicEmitter.h   |  2 ++
 3 files changed, 30 insertions(+), 8 deletions(-)

diff --git a/llvm/utils/TableGen/CodeGenIntrinsics.h b/llvm/utils/TableGen/CodeGenIntrinsics.h
index bca52bcadda2..0c39d8e4be80 100644
--- a/llvm/utils/TableGen/CodeGenIntrinsics.h
+++ b/llvm/utils/TableGen/CodeGenIntrinsics.h
@@ -25,7 +25,8 @@ namespace llvm {
     Record *TheDef;            // The actual record defining this instruction.
     std::string Name;          // The name of the LLVM function "llvm.bswap.i32"
     std::string EnumName;      // The name of the enum "bswap_i32"
-
+    std::string GCCBuiltinName;// Name of the corresponding GCC builtin, or "".
+    
     /// ArgTypes - The type primitive enum value for the return value and all
     /// of the arguments.  These are things like Type::UIntTyID.
     std::vector<std::string> ArgTypes;
diff --git a/llvm/utils/TableGen/IntrinsicEmitter.cpp b/llvm/utils/TableGen/IntrinsicEmitter.cpp
index 9396bdfe6e56..074a8dbfc86b 100644
--- a/llvm/utils/TableGen/IntrinsicEmitter.cpp
+++ b/llvm/utils/TableGen/IntrinsicEmitter.cpp
@@ -33,6 +33,7 @@ CodeGenIntrinsic::CodeGenIntrinsic(Record *R) {
       std::string(DefName.begin(), DefName.begin()+4) != "int_")
     throw "Intrinsic '" + DefName + "' does not start with 'int_'!";
   EnumName = std::string(DefName.begin()+4, DefName.end());
+  GCCBuiltinName = R->getValueAsString("GCCBuiltinName");
   
   Name = R->getValueAsString("LLVMName");
   if (Name == "") {
@@ -105,6 +106,9 @@ void IntrinsicEmitter::run(std::ostream &OS) {
   
   // Emit side effect info for each function.
   EmitSideEffectInfo(Ints, OS);
+
+  // Emit a list of intrinsics with corresponding GCC builtins.
+  EmitGCCBuiltinList(Ints, OS);
 }
 
 void IntrinsicEmitter::EmitEnumInfo(const std::vector<CodeGenIntrinsic> &Ints,
@@ -221,16 +225,31 @@ EmitSideEffectInfo(const std::vector<CodeGenIntrinsic> &Ints, std::ostream &OS){
   OS << "  default: break;\n";
   for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
     switch (Ints[i].ModRef) {
-      default: break;
-      case CodeGenIntrinsic::NoMem:
-      case CodeGenIntrinsic::ReadArgMem:
-      case CodeGenIntrinsic::ReadMem:
-        OS << "  case Intrinsic::" << Ints[i].EnumName << ":\n";
-        break;
+    default: break;
+    case CodeGenIntrinsic::NoMem:
+    case CodeGenIntrinsic::ReadArgMem:
+    case CodeGenIntrinsic::ReadMem:
+      OS << "  case Intrinsic::" << Ints[i].EnumName << ":\n";
+      break;
     }
   }
   OS << "    return true; // These intrinsics have no side effects.\n";
   OS << "  }\n";
   OS << "#endif\n\n";
-  
 }
+
+void IntrinsicEmitter::
+EmitGCCBuiltinList(const std::vector<CodeGenIntrinsic> &Ints, std::ostream &OS){
+  OS << "// Get the GCC builtin that corresponds to an LLVM intrinsic.\n";
+  OS << "#ifdef GET_GCC_BUILTIN_NAME\n";
+  OS << "  switch (F->getIntrinsicID()) {\n";
+  OS << "  default: BuiltinName = \"\"; break;\n";
+  for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
+    if (!Ints[i].GCCBuiltinName.empty()) {
+      OS << "  case Intrinsic::" << Ints[i].EnumName << ": BuiltinName = \""
+         << Ints[i].GCCBuiltinName << "\"; break;\n";
+    }
+  }
+  OS << "  }\n";
+  OS << "#endif\n\n";
+}
\ No newline at end of file
diff --git a/llvm/utils/TableGen/IntrinsicEmitter.h b/llvm/utils/TableGen/IntrinsicEmitter.h
index a8e1ffa54a0d..f410b532ad92 100644
--- a/llvm/utils/TableGen/IntrinsicEmitter.h
+++ b/llvm/utils/TableGen/IntrinsicEmitter.h
@@ -37,6 +37,8 @@ namespace llvm {
                         std::ostream &OS);
     void EmitSideEffectInfo(const std::vector<CodeGenIntrinsic> &Ints, 
                             std::ostream &OS);
+    void EmitGCCBuiltinList(const std::vector<CodeGenIntrinsic> &Ints, 
+                            std::ostream &OS);
   };
 
 } // End llvm namespace