[X86] Add some comments about when some X86 intrinsic autoupgrade code was added.

Someday we'd like to remove old autoupgrade code so it helps to annotate how long its been there so we don't have to go digging through commit history.

llvm-svn: 348728

1 files changed, 7 insertions, 7 deletions

diff --git a/llvm/lib/IR/AutoUpgrade.cpp b/llvm/lib/IR/AutoUpgrade.cpp
index 10cb1ac698d..83fc4787cf9 100644
--- a/llvm/lib/IR/AutoUpgrade.cpp
+++ b/llvm/lib/IR/AutoUpgrade.cpp
@@ -382,20 +382,20 @@ static bool UpgradeX86IntrinsicFunction(Function *F, StringRef Name,
     return true;
   }
 
-  if (Name == "addcarryx.u32")
+  if (Name == "addcarryx.u32") // Added in 8.0
     return UpgradeADCSBBIntrinsic(F, Intrinsic::x86_addcarryx_u32, NewFn);
-  if (Name == "addcarryx.u64")
+  if (Name == "addcarryx.u64") // Added in 8.0
     return UpgradeADCSBBIntrinsic(F, Intrinsic::x86_addcarryx_u64, NewFn);
-  if (Name == "addcarry.u32")
+  if (Name == "addcarry.u32") // Added in 8.0
     return UpgradeADCSBBIntrinsic(F, Intrinsic::x86_addcarry_u32, NewFn);
-  if (Name == "addcarry.u64")
+  if (Name == "addcarry.u64") // Added in 8.0
     return UpgradeADCSBBIntrinsic(F, Intrinsic::x86_addcarry_u64, NewFn);
-  if (Name == "subborrow.u32")
+  if (Name == "subborrow.u32") // Added in 8.0
     return UpgradeADCSBBIntrinsic(F, Intrinsic::x86_subborrow_u32, NewFn);
-  if (Name == "subborrow.u64")
+  if (Name == "subborrow.u64") // Added in 8.0
     return UpgradeADCSBBIntrinsic(F, Intrinsic::x86_subborrow_u64, NewFn);
 
-  if (Name == "rdtscp") {
+  if (Name == "rdtscp") { // Added in 8.0
     // If this intrinsic has 0 operands, it's the new version.
     if (F->getFunctionType()->getNumParams() == 0)
       return false;