[Mips] Support -mnan=2008 option. Define "__mips_nan2008" macros and pass

this option to the assembler.

llvm-svn: 191282

clang/include/clang/Driver/Options.td

@@ -1062,6 +1062,7 @@ def mmsa : Flag<["-"], "mmsa">, Group<m_Group>,
   HelpText<"Enable MSA ASE on MIPS processors">, Flags<[HelpHidden]>;
 def mno_msa : Flag<["-"], "mno-msa">, Group<m_Group>,
   HelpText<"Disable MSA ASE on MIPS processors">, Flags<[HelpHidden]>;
+def mnan_EQ : Joined<["-"], "mnan=">, Group<m_Group>;
 def mips32 : Flag<["-"], "mips32">, Group<mips_CPUs_Group>,
   HelpText<"Equivalent to -march=mips32">, Flags<[HelpHidden]>;
 def mips32r2 : Flag<["-"], "mips32r2">, Group<mips_CPUs_Group>,

clang/lib/Basic/Targets.cpp

@@ -4647,6 +4647,7 @@ class MipsTargetInfoBase : public TargetInfo {
   std::string CPU;
   bool IsMips16;
   bool IsMicromips;
+  bool IsNan2008;
   bool IsSingleFloat;
   enum MipsFloatABI {
     HardFloat, SoftFloat
@@ -4663,8 +4664,8 @@ public:
   MipsTargetInfoBase(const llvm::Triple &Triple, const std::string &ABIStr,
                      const std::string &CPUStr)
       : TargetInfo(Triple), CPU(CPUStr), IsMips16(false), IsMicromips(false),
-        IsSingleFloat(false), FloatABI(HardFloat), DspRev(NoDSP),
-        HasMSA(false), ABI(ABIStr) {}
+        IsNan2008(false), IsSingleFloat(false), FloatABI(HardFloat),
+        DspRev(NoDSP), HasMSA(false), ABI(ABIStr) {}
 
   virtual const char *getABI() const { return ABI.c_str(); }
   virtual bool setABI(const std::string &Name) = 0;
@@ -4701,6 +4702,9 @@ public:
     if (IsMicromips)
       Builder.defineMacro("__mips_micromips", Twine(1));
 
+    if (IsNan2008)
+      Builder.defineMacro("__mips_nan2008", Twine(1));
+
     switch (DspRev) {
     default:
       break;
@@ -4790,6 +4794,7 @@ public:
                                     DiagnosticsEngine &Diags) {
     IsMips16 = false;
     IsMicromips = false;
+    IsNan2008 = false;
     IsSingleFloat = false;
     FloatABI = HardFloat;
     DspRev = NoDSP;
@@ -4810,13 +4815,18 @@ public:
         DspRev = std::max(DspRev, DSP2);
       else if (*it == "+msa")
         HasMSA = true;
+      else if (*it == "+nan2008")
+        IsNan2008 = true;
     }
 
-    // Remove front-end specific option.
+    // Remove front-end specific options.
     std::vector<std::string>::iterator it =
       std::find(Features.begin(), Features.end(), "+soft-float");
     if (it != Features.end())
       Features.erase(it);
+    it = std::find(Features.begin(), Features.end(), "+nan2008");
+    if (it != Features.end())
+      Features.erase(it);
 
     return true;
   }

clang/lib/Driver/Tools.cpp

@@ -948,6 +948,11 @@ static void getMIPSTargetFeatures(const Driver &D, const ArgList &Args,
     Features.push_back("+soft-float");
   }
 
+  if (Arg *A = Args.getLastArg(options::OPT_mnan_EQ)) {
+    if (StringRef(A->getValue()) == "2008")
+      Features.push_back("+nan2008");
+  }
+
   AddTargetFeature(Args, Features, options::OPT_msingle_float,
                    options::OPT_mdouble_float, "single-float");
   AddTargetFeature(Args, Features, options::OPT_mips16, options::OPT_mno_mips16,
@@ -5942,6 +5947,11 @@ void gnutools::Assemble::ConstructJob(Compilation &C, const JobAction &JA,
     else
       CmdArgs.push_back("-EL");
 
+    if (Arg *A = Args.getLastArg(options::OPT_mnan_EQ)) {
+      if (StringRef(A->getValue()) == "2008")
+        CmdArgs.push_back(Args.MakeArgString("-mnan=2008"));
+    }
+
     Args.AddLastArg(CmdArgs, options::OPT_mips16, options::OPT_mno_mips16);
     Args.AddLastArg(CmdArgs, options::OPT_mmicromips,
                     options::OPT_mno_micromips);

clang/test/Driver/mips-as.c

@@ -115,3 +115,14 @@
 // RUN:   | FileCheck -check-prefix=MIPS-NDSPR2 %s
 // MIPS-NDSPR2: as{{(.exe)?}}"
 // MIPS-NDSPR2-NOT: "-mdspr2"
+//
+// RUN: %clang -target mips-linux-gnu -mnan=legacy -mnan=2008 -### \
+// RUN:   -no-integrated-as -c %s 2>&1 \
+// RUN:   | FileCheck -check-prefix=MIPS-NAN2008 %s
+// MIPS-NAN2008: as{{(.exe)?}}" "-march" "mips32" "-mabi" "32" "-EB" "-mnan=2008"
+//
+// RUN: %clang -target mips-linux-gnu -mnan=2008 -mnan=legacy -### \
+// RUN:   -no-integrated-as -c %s 2>&1 \
+// RUN:   | FileCheck -check-prefix=MIPS-NAN-LEGACY %s
+// MIPS-NAN-LEGACY: as{{(.exe)?}}"
+// MIPS-NAN_LEGACY-NOT: "-mnan={{.*}}"

clang/test/Preprocessor/init.c

@@ -1229,6 +1229,11 @@
 // RUN:   | FileCheck -check-prefix MIPS-MSA %s
 // MIPS-MSA:#define __mips_msa 1
 //
+// RUN: %clang_cc1 -target-feature +nan2008 \
+// RUN:   -E -dM -triple=mips-none-none < /dev/null \
+// RUN:   | FileCheck -check-prefix MIPS-NAN2008 %s
+// MIPS-NAN2008:#define __mips_nan2008 1
+//
 // RUN: %clang_cc1 -E -dM -ffreestanding -triple=msp430-none-none < /dev/null | FileCheck -check-prefix MSP430 %s
 //
 // MSP430:#define MSP430 1