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

To support the generation of IT block in Thumbv7 way or
Thumbv8 way

llvm-svn: 194593
This commit is contained in:
Weiming Zhao 2013-11-13 18:31:23 +00:00
parent 0da5cc0765
commit 580dcfbd27
2 changed files with 15 additions and 0 deletions
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4
clang/include/clang/Driver/Options.td
View File

@ -1029,6 +1029,10 @@ def mno_unaligned_access : Flag<["-"], "mno-unaligned-access">, Group<m_arm_Feat
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)">;

11
clang/lib/Driver/Tools.cpp
View File

@ -3072,6 +3072,17 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
}
}
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)) {