[IR] Upgrade comment token in objc retain release marker for asm call

Older compiler issued '#' instead of ';'

llvm-svn: 330173

include/llvm/IR/AutoUpgrade.h

@@ -37,6 +37,10 @@ namespace llvm {
   /// intrinsic function with a call to the specified new function.
   void UpgradeIntrinsicCall(CallInst *CI, Function *NewFn);
 
+  // This upgrades the comment for objc retain release markers in inline asm
+  // calls
+  void UpgradeInlineAsmString(std::string *AsmStr);
+
   /// This is an auto-upgrade hook for any old intrinsic function syntaxes
   /// which need to have both the function updated as well as all calls updated
   /// to the new function. This should only be run in a post-processing fashion

lib/Bitcode/Reader/BitcodeReader.cpp

@@ -2522,6 +2522,7 @@ Error BitcodeReader::parseConstants() {
       for (unsigned i = 0; i != ConstStrSize; ++i)
         ConstrStr += (char)Record[3+AsmStrSize+i];
       PointerType *PTy = cast<PointerType>(CurTy);
+      UpgradeInlineAsmString(&AsmStr);
       V = InlineAsm::get(cast<FunctionType>(PTy->getElementType()),
                          AsmStr, ConstrStr, HasSideEffects, IsAlignStack);
       break;
@@ -2547,6 +2548,7 @@ Error BitcodeReader::parseConstants() {
       for (unsigned i = 0; i != ConstStrSize; ++i)
         ConstrStr += (char)Record[3+AsmStrSize+i];
       PointerType *PTy = cast<PointerType>(CurTy);
+      UpgradeInlineAsmString(&AsmStr);
       V = InlineAsm::get(cast<FunctionType>(PTy->getElementType()),
                          AsmStr, ConstrStr, HasSideEffects, IsAlignStack,
                          InlineAsm::AsmDialect(AsmDialect));

lib/IR/AutoUpgrade.cpp

@@ -1169,6 +1169,19 @@ static bool upgradeAVX512MaskToSelect(StringRef Name, IRBuilder<> &Builder,
   return true;
 }
 
+/// Upgrade comment in call to inline asm that represents an objc retain release
+/// marker.
+void llvm::UpgradeInlineAsmString(std::string *AsmStr) {
+
+  unsigned long Pos;
+  if (AsmStr->find("mov\tfp") == 0 &&
+      AsmStr->find("objc_retainAutoreleaseReturnValue") != std::string::npos &&
+      (Pos = AsmStr->find("# marker")) != std::string::npos) {
+    AsmStr->replace(Pos, 1, ";");
+  }
+  return;
+}
+
 /// Upgrade a call to an old intrinsic. All argument and return casting must be
 /// provided to seamlessly integrate with existing context.
 void llvm::UpgradeIntrinsicCall(CallInst *CI, Function *NewFn) {

test/Bitcode/upgrade-objcretainrelease-asm.ll

@@ -0,0 +1,9 @@
+; Test that comment token for objc retain release is upgraded from '#' to ';'
+;
+; RUN: llvm-dis < %s.bc | FileCheck %s
+
+define void @inlineasm() {
+  call void asm sideeffect "mov\09fp, fp\09\09# marker for objc_retainAutoreleaseReturnValue", ""()
+  ;CHECK: call void asm sideeffect "mov\09fp, fp\09\09; marker for objc_retainAutoreleaseReturnValue", ""()
+  ret void
+}