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" _______________________________________________ cfe-commits mailing list cfe-commits@cs.uiuc.edu http://lists.cs.uiuc.edu/mailman/listinfo/cfe-commits