r243185 - [AArch64] Pass subtarget feature "+reserve-x18" instead of passing backend

[Akira Hatanaka]

Author: ahatanak
Date: Fri Jul 24 19:18:00 2015
New Revision: 243185

URL: http://llvm.org/viewvc/llvm-project?rev=243185&view=rev
Log:
[AArch64] Pass subtarget feature "+reserve-x18" instead of passing backend
option "-aarch64-reserve-x18".

This change is needed since backend options do not make it to the backend
when doing LTO and are not capable of changing the behavior of code-gen
passes on a per-function basis.

rdar://problem/21529937

Differential Revision: http://reviews.llvm.org/D11462

Modified:
    cfe/trunk/lib/Driver/Tools.cpp

Modified: cfe/trunk/lib/Driver/Tools.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Driver/Tools.cpp?rev=243185&r1=243184&r2=243185&view=diff
==============================================================================
--- cfe/trunk/lib/Driver/Tools.cpp (original)
+++ cfe/trunk/lib/Driver/Tools.cpp Fri Jul 24 19:18:00 2015
@@ -919,11 +919,6 @@ void Clang::AddAArch64TargetArgs(const A
     else
       CmdArgs.push_back("-aarch64-global-merge=true");
   }
-
-  if (Args.hasArg(options::OPT_ffixed_x18)) {
-    CmdArgs.push_back("-backend-option");
-    CmdArgs.push_back("-aarch64-reserve-x18");
-  }
 }
 
 // Get CPU and ABI names. They are not independent
@@ -1971,6 +1966,9 @@ static void getAArch64TargetFeatures(con
     else
       Features.push_back("-crc");
   }
+
+  if (Args.hasArg(options::OPT_ffixed_x18))
+    Features.push_back("+reserve-x18");
 }
 
 static void getTargetFeatures(const Driver &D, const llvm::Triple &Triple,