r194593 - Adds ARM backend options: -mrestrict-it and -mno-restrict-it

[mcrosier at codeaurora.org]

Hi Weiming,
Can you please add a driver test?

See test/Driver/arm-alignment.c as an example.

 Chad

> Author: weimingz
> Date: Wed Nov 13 12:31:23 2013
> New Revision: 194593
>
> URL: http://llvm.org/viewvc/llvm-project?rev=194593&view=rev
> Log:
> Adds ARM backend options: -mrestrict-it and -mno-restrict-it
>
> To support the generation of IT block in Thumbv7 way or
> Thumbv8 way
>
> Modified:
>     cfe/trunk/include/clang/Driver/Options.td
>     cfe/trunk/lib/Driver/Tools.cpp
>
> Modified: cfe/trunk/include/clang/Driver/Options.td
> URL:
> http://llvm.org/viewvc/llvm-project/cfe/trunk/include/clang/Driver/Options.td?rev=194593&r1=194592&r2=194593&view=diff
> ==============================================================================
> --- cfe/trunk/include/clang/Driver/Options.td (original)
> +++ cfe/trunk/include/clang/Driver/Options.td Wed Nov 13 12:31:23 2013
> @@ -1029,6 +1029,10 @@ def mno_unaligned_access : Flag<["-"], "
>  def mstrict_align : Flag<["-"], "mstrict-align">,
> Alias<mno_unaligned_access>, Flags<[CC1Option,HelpHidden]>,
>    HelpText<"Force all memory accesses to be aligned (ARM only, same as
> mno-unaligned-access)">;
>  def mno_thumb : Flag<["-"], "mno-thumb">, Group<m_arm_Features_Group>;
> +def mrestrict_it: Flag<["-"], "mrestrict-it">,
> Group<m_arm_Features_Group>,
> +  HelpText<"Disallow generation of deprecated IT blocks for ARMv8. It is
> on by default for ARMv8 Thumb mode.">;
> +def mno_restrict_it: Flag<["-"], "mno-restrict-it">,
> Group<m_arm_Features_Group>,
> +  HelpText<"Allow generation of deprecated IT blocks for ARMv8. It is off
> by default for ARMv8 Thumb mode">;
>  def marm : Flag<["-"], "marm">, Alias<mno_thumb>;
>  def ffixed_r9 : Flag<["-"], "ffixed-r9">, Group<m_arm_Features_Group>,
>    HelpText<"Reserve the r9 register (ARM only)">;
>
> Modified: cfe/trunk/lib/Driver/Tools.cpp
> URL:
> http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Driver/Tools.cpp?rev=194593&r1=194592&r2=194593&view=diff
> ==============================================================================
> --- cfe/trunk/lib/Driver/Tools.cpp (original)
> +++ cfe/trunk/lib/Driver/Tools.cpp Wed Nov 13 12:31:23 2013
> @@ -3072,6 +3072,17 @@ void Clang::ConstructJob(Compilation &C,
>      }
>    }
>
> +  if (Arg *A = Args.getLastArg(options::OPT_mrestrict_it,
> +                               options::OPT_mno_restrict_it)) {
> +    if (A->getOption().matches(options::OPT_mrestrict_it)) {
> +      CmdArgs.push_back("-backend-option");
> +      CmdArgs.push_back("-arm-restrict-it");
> +    } else {
> +      CmdArgs.push_back("-backend-option");
> +      CmdArgs.push_back("-arm-no-restrict-it");
> +    }
> +  }
> +
>    // Forward -f options with positive and negative forms; we translate
>    // these by hand.
>    if (Arg *A = Args.getLastArg(options::OPT_fprofile_sample_use_EQ)) {
>
>
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