From 6a86ec1ef0fb0641138e65ec1903b743437e8615 Mon Sep 17 00:00:00 2001
From: Evan Cheng <evan.cheng@apple.com>
Date: Sat, 20 Sep 2008 00:13:45 +0000
Subject: [PATCH] No need to print function stubs for Mac OS X 10.5 and up.
 Linker will handle it.

llvm-svn: 56378
---
 lib/Target/X86/AsmPrinter/X86ATTAsmPrinter.cpp | 13 ++++++++++---
 test/CodeGen/X86/darwin-stub.ll                | 12 ++++++++++++
 2 files changed, 22 insertions(+), 3 deletions(-)
 create mode 100644 test/CodeGen/X86/darwin-stub.ll

diff --git a/lib/Target/X86/AsmPrinter/X86ATTAsmPrinter.cpp b/lib/Target/X86/AsmPrinter/X86ATTAsmPrinter.cpp
index 6977ead58e1..678b619f7ee 100644
--- a/lib/Target/X86/AsmPrinter/X86ATTAsmPrinter.cpp
+++ b/lib/Target/X86/AsmPrinter/X86ATTAsmPrinter.cpp
@@ -392,8 +392,13 @@ void X86ATTAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
       if (GV->isDeclaration() || GV->isWeakForLinker()) {
         // Dynamically-resolved functions need a stub for the function.
         if (isCallOp && isa<Function>(GV)) {
-          FnStubs.insert(Name);
-          printSuffixedName(Name, "$stub");
+          // Function stubs are no longer needed for Mac OS X 10.5 and up.
+          if (Subtarget->isTargetDarwin() && Subtarget->getDarwinVers() >= 9) {
+            O << Name;
+          } else {
+            FnStubs.insert(Name);
+            printSuffixedName(Name, "$stub");
+          }
         } else {
           GVStubs.insert(Name);
           printSuffixedName(Name, "$non_lazy_ptr");
@@ -475,7 +480,9 @@ void X86ATTAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
     bool needCloseParen = false;
     std::string Name(TAI->getGlobalPrefix());
     Name += MO.getSymbolName();
-    if (isCallOp && shouldPrintStub(TM, Subtarget)) {
+    // Print function stub suffix unless it's Mac OS X 10.5 and up.
+    if (isCallOp && shouldPrintStub(TM, Subtarget) && 
+        !(Subtarget->isTargetDarwin() && Subtarget->getDarwinVers() >= 9)) {
       FnStubs.insert(Name);
       printSuffixedName(Name, "$stub");
       return;
diff --git a/test/CodeGen/X86/darwin-stub.ll b/test/CodeGen/X86/darwin-stub.ll
new file mode 100644
index 00000000000..79eb31ac0fd
--- /dev/null
+++ b/test/CodeGen/X86/darwin-stub.ll
@@ -0,0 +1,12 @@
+; RUN: llvm-as < %s | llc -mtriple=i386-apple-darwin  |     grep stub
+; RUN: llvm-as < %s | llc -mtriple=i386-apple-darwin9 | not grep stub
+
+@"\01LC" = internal constant [13 x i8] c"Hello World!\00"		; <[13 x i8]*> [#uses=1]
+
+define i32 @main() nounwind {
+entry:
+	%0 = tail call i32 @puts(i8* getelementptr ([13 x i8]* @"\01LC", i32 0, i32 0)) nounwind		; <i32> [#uses=0]
+	ret i32 0
+}
+
+declare i32 @puts(i8*)