Driver: Handle -f{no-}honor-infinities, -f{no-}honor-nans, and

-ffinite-math-only.
 - No test case yet, I don't know how to construct a situation where this
   matters.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@146297 91177308-0d34-0410-b5e6-96231b3b80d8

include/clang/Driver/CC1Options.td

@@ -166,6 +166,10 @@ def mdebug_pass : Separate<"-mdebug-pass">,
   HelpText<"Enable additional debug output">;
 def mdisable_fp_elim : Flag<"-mdisable-fp-elim">,
   HelpText<"Disable frame pointer elimination optimization">;
+def menable_no_infinities : Flag<"-menable-no-infs">,
+  HelpText<"Allow optimization to assume there are no infinities.">;
+def menable_no_nans : Flag<"-menable-no-nans">,
+  HelpText<"Allow optimization to assume there are no NaNs.">;
 def mfloat_abi : Separate<"-mfloat-abi">,
   HelpText<"The float ABI to use">;
 def mno_global_merge : Flag<"-mno-global-merge">,

include/clang/Driver/Options.td

@@ -315,7 +315,16 @@ def fexceptions : Flag<"-fexceptions">, Group<f_Group>;
 def fextdirs_EQ : Joined<"-fextdirs=">, Group<f_Group>;
 def fhosted : Flag<"-fhosted">, Group<f_Group>;
 def ffast_math : Flag<"-ffast-math">, Group<clang_ignored_f_Group>;
-def ffinite_math_only : Flag<"-ffinite-math-only">, Group<clang_ignored_f_Group>;
+def ffinite_math_only : Flag<"-ffinite-math-only">, Group<f_Group>;
+def fhonor_nans : Flag<"-fhonor-nans">, Group<f_Group>;
+def fno_honor_nans : Flag<"-fno-honor-nans">, Group<f_Group>;
+def fhonor_infinities : Flag<"-fhonor-infinities">, Group<f_Group>;
+def fno_honor_infinities : Flag<"-fno-honor-infinities">, Group<f_Group>;
+// Sic. This option was misspelled originally.
+def fhonor_infinites : Flag<"-fhonor-infinites">, Group<f_Group>,
+    Alias<fhonor_infinities>;
+def fno_honor_infinites : Flag<"-fno-honor-infinites">, Group<f_Group>,
+    Alias<fno_honor_infinities>;
 
 def ffor_scope : Flag<"-ffor-scope">, Group<f_Group>;
 def fno_for_scope : Flag<"-fno-for-scope">, Group<f_Group>;

lib/Driver/Tools.cpp

@@ -1345,6 +1345,18 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
                     getToolChain().IsStrictAliasingDefault()))
     CmdArgs.push_back("-relaxed-aliasing");
 
+  // Handle -f{no-}honor-infinities, -f{no-}honor-nans, and -ffinite-math-only.
+  bool HonorInfinities = Args.hasFlag(options::OPT_fhonor_infinities,
+                                      options::OPT_fno_honor_infinities);
+  bool HonorNaNs = Args.hasFlag(options::OPT_fhonor_nans,
+                                options::OPT_fno_honor_nans);
+  if (Args.hasArg(options::OPT_ffinite_math_only))
+    HonorInfinities = HonorNaNs = false;
+  if (!HonorInfinities)
+    CmdArgs.push_back("-menable-no-infs");
+  if (!HonorNaNs)
+    CmdArgs.push_back("-menable-no-nans");
+    
   // Decide whether to use verbose asm. Verbose assembly is the default on
   // toolchains which have the integrated assembler on by default.
   bool IsVerboseAsmDefault = getToolChain().IsIntegratedAssemblerDefault();

lib/Frontend/CompilerInvocation.cpp

@@ -183,6 +183,10 @@ static void CodeGenOptsToArgs(const CodeGenOptions &Opts,
     Res.push_back("-main-file-name");
     Res.push_back(Opts.MainFileName);
   }
+  if (Opts.NoInfsFPMath)
+    Res.push_back("-menable-no-infinities");
+  if (Opts.NoNaNsFPMath)
+    Res.push_back("-menable-no-nans");
   // SimplifyLibCalls is only derived.
   // TimePasses is only derived.
   // UnitAtATime is unused.
@@ -1083,8 +1087,12 @@ static void ParseCodeGenArgs(CodeGenOptions &Opts, ArgList &Args, InputKind IK,
   Opts.HiddenWeakVTables = Args.hasArg(OPT_fhidden_weak_vtables);
   Opts.LessPreciseFPMAD = Args.hasArg(OPT_cl_mad_enable);
   Opts.LimitFloatPrecision = Args.getLastArgValue(OPT_mlimit_float_precision);
-  Opts.NoInfsFPMath = Opts.NoNaNsFPMath = Args.hasArg(OPT_cl_finite_math_only)||
-                                          Args.hasArg(OPT_cl_fast_relaxed_math);
+  Opts.NoInfsFPMath = (Args.hasArg(OPT_menable_no_infinities) ||
+                       Args.hasArg(OPT_cl_finite_math_only)||
+                       Args.hasArg(OPT_cl_fast_relaxed_math));
+  Opts.NoNaNsFPMath = (Args.hasArg(OPT_menable_no_nans) ||
+                       Args.hasArg(OPT_cl_finite_math_only)||
+                       Args.hasArg(OPT_cl_fast_relaxed_math));
   Opts.NoZeroInitializedInBSS = Args.hasArg(OPT_mno_zero_initialized_in_bss);
   Opts.BackendOptions = Args.getAllArgValues(OPT_backend_option);
   Opts.NumRegisterParameters = Args.getLastArgIntValue(OPT_mregparm, 0, Diags);