r242736 - [ARM] Pass subtarget feature "+reserve-r9" instead of passing backend

[Akira Hatanaka]

Author: ahatanak
Date: Mon Jul 20 18:20:53 2015
New Revision: 242736

URL: http://llvm.org/viewvc/llvm-project?rev=242736&view=rev
Log:
[ARM] Pass subtarget feature "+reserve-r9" instead of passing backend
option "-arm-reserve-r9".
        
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/D11319

Modified:
    cfe/trunk/lib/Driver/Tools.cpp
    cfe/trunk/test/Driver/arm-fixed-r9.c

Modified: cfe/trunk/lib/Driver/Tools.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Driver/Tools.cpp?rev=242736&r1=242735&r2=242736&view=diff
==============================================================================
--- cfe/trunk/lib/Driver/Tools.cpp (original)
+++ cfe/trunk/lib/Driver/Tools.cpp Mon Jul 20 18:20:53 2015
@@ -719,6 +719,12 @@ static void getARMTargetFeatures(const D
       Features.push_back("+long-calls");
   }
 
+  // llvm does not support reserving registers in general. There is support
+  // for reserving r9 on ARM though (defined as a platform-specific register
+  // in ARM EABI).
+  if (Args.hasArg(options::OPT_ffixed_r9))
+    Features.push_back("+reserve-r9");
+
   // The kext linker doesn't know how to deal with movw/movt.
   if (KernelOrKext)
     Features.push_back("+no-movt");
@@ -828,13 +834,6 @@ void Clang::AddARMTargetArgs(const ArgLi
                     options::OPT_mno_implicit_float, true))
     CmdArgs.push_back("-no-implicit-float");
 
-  // llvm does not support reserving registers in general. There is support
-  // for reserving r9 on ARM though (defined as a platform-specific register
-  // in ARM EABI).
-  if (Args.hasArg(options::OPT_ffixed_r9)) {
-    CmdArgs.push_back("-backend-option");
-    CmdArgs.push_back("-arm-reserve-r9");
-  }
 }
 
 /// getAArch64TargetCPU - Get the (LLVM) name of the AArch64 cpu we are

Modified: cfe/trunk/test/Driver/arm-fixed-r9.c
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/Driver/arm-fixed-r9.c?rev=242736&r1=242735&r2=242736&view=diff
==============================================================================
--- cfe/trunk/test/Driver/arm-fixed-r9.c (original)
+++ cfe/trunk/test/Driver/arm-fixed-r9.c Mon Jul 20 18:20:53 2015
@@ -1,4 +1,4 @@
 // RUN: %clang -target arm-none-gnueabi -ffixed-r9 -### %s 2> %t
 // RUN: FileCheck --check-prefix=CHECK-FIXED-R9 < %t %s
 
-// CHECK-FIXED-R9: "-backend-option" "-arm-reserve-r9"
+// CHECK-FIXED-R9: "-target-feature" "+reserve-r9"