[PATCH] D11319: Pass subtarget feature "+reserve-r9" instead of passing backend option "-arm-reserve-r9"

[Akira Hatanaka]

ahatanak created this revision.
ahatanak added reviewers: echristo, dexonsmith.
ahatanak added a subscriber: cfe-commits.
Herald added subscribers: rengolin, aemerson.

This is needed since backend options do not make it to the backend when doing LTO.

http://reviews.llvm.org/D11319

Files:
  lib/Driver/Tools.cpp
  test/Driver/arm-fixed-r9.c

Index: test/Driver/arm-fixed-r9.c
===================================================================
--- test/Driver/arm-fixed-r9.c
+++ test/Driver/arm-fixed-r9.c
@@ -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"
Index: lib/Driver/Tools.cpp
===================================================================
--- lib/Driver/Tools.cpp
+++ lib/Driver/Tools.cpp
@@ -719,6 +719,12 @@
       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 @@
                     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


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