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[Flang] Add option to disable adding alias tags #193

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[Flang] Add option to disable adding alias tags #193

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4 changes: 4 additions & 0 deletions clang/include/clang/Driver/Options.td
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Original file line number Diff line number Diff line change
Expand Up @@ -6842,6 +6842,10 @@ def fno_automatic : Flag<["-"], "fno-automatic">, Group<f_Group>,
defm stack_arrays : BoolOptionWithoutMarshalling<"f", "stack-arrays",
PosFlag<SetTrue, [], [ClangOption], "Attempt to allocate array temporaries on the stack, no matter their size">,
NegFlag<SetFalse, [], [ClangOption], "Allocate array temporaries on the heap (default)">>;

def fno_add_alias_tags : Flag<["-"], "fno-add-alias-tags">, Group<f_Group>,
HelpText<"Disable adding alias tags">;

defm loop_versioning : BoolOptionWithoutMarshalling<"f", "version-loops-for-stride",
PosFlag<SetTrue, [], [ClangOption], "Create unit-strided versions of loops">,
NegFlag<SetFalse, [], [ClangOption], "Do not create unit-strided loops (default)">>;
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3 changes: 3 additions & 0 deletions clang/lib/Driver/ToolChains/Flang.cpp
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Expand Up @@ -148,6 +148,9 @@ void Flang::addCodegenOptions(const ArgList &Args,
if (shouldLoopVersion(Args))
CmdArgs.push_back("-fversion-loops-for-stride");

if (Args.getLastArg(options::OPT_fno_add_alias_tags))
CmdArgs.push_back("-fno-add-alias-tags");

Args.addAllArgs(CmdArgs, {options::OPT_flang_experimental_hlfir,
options::OPT_flang_deprecated_no_hlfir,
options::OPT_flang_experimental_integer_overflow,
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6 changes: 4 additions & 2 deletions flang/lib/Frontend/CompilerInvocation.cpp
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Expand Up @@ -271,8 +271,10 @@ static void parseCodeGenArgs(Fortran::frontend::CodeGenOptions &opts,
if (args.hasFlag(clang::driver::options::OPT_floop_versioning,
clang::driver::options::OPT_fno_loop_versioning, false))
opts.LoopVersioning = 1;

opts.AliasAnalysis = opts.OptimizationLevel > 0;
if (args.getLastArg(clang::driver::options::OPT_fno_add_alias_tags))
opts.AliasAnalysis = false;
else
opts.AliasAnalysis = opts.OptimizationLevel > 0;

// -mframe-pointer=none/non-leaf/all option.
if (const llvm::opt::Arg *a =
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