9 files changed, 83 insertions, 3 deletions
diff --git a/clang/include/clang/Basic/DiagnosticDriverKinds.td b/clang/include/clang/Basic/DiagnosticDriverKinds.td
index 4f13fa125b2..a076b02ea53 100644
--- a/clang/include/clang/Basic/DiagnosticDriverKinds.td
+++ b/clang/include/clang/Basic/DiagnosticDriverKinds.td
@@ -285,6 +285,12 @@ def warn_target_unsupported_nan2008 : Warning<
 def warn_target_unsupported_nanlegacy : Warning<
   "ignoring '-mnan=legacy' option because the '%0' architecture does not support it">,
   InGroup<UnsupportedNan>;
+def warn_target_unsupported_abslegacy : Warning<
+  "ignoring '-mabs=legacy' option because the '%0' architecture does not support it">,
+  InGroup<UnsupportedAbs>;
+def warn_target_unsupported_abs2008 : Warning<
+  "ignoring '-mabs=2008' option because the '%0' architecture does not support it">,
+  InGroup<UnsupportedAbs>;
 def warn_target_unsupported_compact_branches : Warning<
   "ignoring '-mcompact-branches=' option because the '%0' architecture does not"
   " support it">, InGroup<UnsupportedCB>;
diff --git a/clang/include/clang/Basic/DiagnosticGroups.td b/clang/include/clang/Basic/DiagnosticGroups.td
index dd0ed0b13cc..f22910dbaea 100644
--- a/clang/include/clang/Basic/DiagnosticGroups.td
+++ b/clang/include/clang/Basic/DiagnosticGroups.td
@@ -61,6 +61,7 @@ def FloatConversion :
 def DoublePromotion : DiagGroup<"double-promotion">;
 def EnumTooLarge : DiagGroup<"enum-too-large">;
 def UnsupportedNan : DiagGroup<"unsupported-nan">;
+def UnsupportedAbs : DiagGroup<"unsupported-abs">;
 def UnsupportedCB : DiagGroup<"unsupported-cb">;
 def UnsupportedGPOpt : DiagGroup<"unsupported-gpopt">;
 def NonLiteralNullConversion : DiagGroup<"non-literal-null-conversion">;
diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td
index 699c2d5054b..6f40bb03e35 100644
--- a/clang/include/clang/Driver/Options.td
+++ b/clang/include/clang/Driver/Options.td
@@ -2066,6 +2066,7 @@ def mno_embedded_data : Flag<["-"], "mno-embedded-data">, Group<m_Group>,
   HelpText<"Do not place constants in the .rodata section instead of the "
            ".sdata if they meet the -G <size> threshold (MIPS)">;
 def mnan_EQ : Joined<["-"], "mnan=">, Group<m_Group>;
+def mabs_EQ : Joined<["-"], "mabs=">, Group<m_Group>;
 def mabicalls : Flag<["-"], "mabicalls">, Group<m_Group>,
   HelpText<"Enable SVR4-style position-independent code (Mips only)">;
 def mno_abicalls : Flag<["-"], "mno-abicalls">, Group<m_Group>,
diff --git a/clang/lib/Basic/Targets/Mips.cpp b/clang/lib/Basic/Targets/Mips.cpp
index 065138b1448..3eb39b377be 100644
--- a/clang/lib/Basic/Targets/Mips.cpp
+++ b/clang/lib/Basic/Targets/Mips.cpp
@@ -149,6 +149,9 @@ void MipsTargetInfo::getTargetDefines(const LangOptions &Opts,
   if (IsNan2008)
     Builder.defineMacro("__mips_nan2008", Twine(1));
 
+  if (IsAbs2008)
+    Builder.defineMacro("__mips_abs2008", Twine(1));
+
   switch (DspRev) {
   default:
     break;
diff --git a/clang/lib/Basic/Targets/Mips.h b/clang/lib/Basic/Targets/Mips.h
index f46aea1e5e7..28900f21f86 100644
--- a/clang/lib/Basic/Targets/Mips.h
+++ b/clang/lib/Basic/Targets/Mips.h
@@ -46,6 +46,7 @@ class LLVM_LIBRARY_VISIBILITY MipsTargetInfo : public TargetInfo {
   bool IsMips16;
   bool IsMicromips;
   bool IsNan2008;
+  bool IsAbs2008;
   bool IsSingleFloat;
   bool IsNoABICalls;
   bool CanUseBSDABICalls;
@@ -61,9 +62,9 @@ protected:
 public:
   MipsTargetInfo(const llvm::Triple &Triple, const TargetOptions &)
       : TargetInfo(Triple), IsMips16(false), IsMicromips(false),
-        IsNan2008(false), IsSingleFloat(false), IsNoABICalls(false),
-        CanUseBSDABICalls(false), FloatABI(HardFloat), DspRev(NoDSP),
-        HasMSA(false), DisableMadd4(false), HasFP64(false) {
+        IsNan2008(false), IsAbs2008(false), IsSingleFloat(false),
+        IsNoABICalls(false), CanUseBSDABICalls(false), FloatABI(HardFloat),
+        DspRev(NoDSP), HasMSA(false), DisableMadd4(false), HasFP64(false) {
     TheCXXABI.set(TargetCXXABI::GenericMIPS);
 
     setABI((getTriple().getArch() == llvm::Triple::mips ||
@@ -300,6 +301,7 @@ public:
     IsMips16 = false;
     IsMicromips = false;
     IsNan2008 = isIEEE754_2008Default();
+    IsAbs2008 = isIEEE754_2008Default();
     IsSingleFloat = false;
     FloatABI = HardFloat;
     DspRev = NoDSP;
@@ -330,6 +332,10 @@ public:
         IsNan2008 = true;
       else if (Feature == "-nan2008")
         IsNan2008 = false;
+      else if (Feature == "+abs2008")
+        IsAbs2008 = true;
+      else if (Feature == "-abs2008")
+        IsAbs2008 = false;
       else if (Feature == "+noabicalls")
         IsNoABICalls = true;
     }
diff --git a/clang/lib/Driver/ToolChains/Arch/Mips.cpp b/clang/lib/Driver/ToolChains/Arch/Mips.cpp
index b96938feb78..70e2e070893 100644
--- a/clang/lib/Driver/ToolChains/Arch/Mips.cpp
+++ b/clang/lib/Driver/ToolChains/Arch/Mips.cpp
@@ -283,6 +283,28 @@ void mips::getMIPSTargetFeatures(const Driver &D, const llvm::Triple &Triple,
           << A->getOption().getName() << Val;
   }
 
+  if (Arg *A = Args.getLastArg(options::OPT_mabs_EQ)) {
+    StringRef Val = StringRef(A->getValue());
+    if (Val == "2008") {
+      if (mips::getIEEE754Standard(CPUName) & mips::Std2008) {
+        Features.push_back("+abs2008");
+      } else {
+        Features.push_back("-abs2008");
+        D.Diag(diag::warn_target_unsupported_abs2008) << CPUName;
+      }
+    } else if (Val == "legacy") {
+      if (mips::getIEEE754Standard(CPUName) & mips::Legacy) {
+        Features.push_back("-abs2008");
+      } else {
+        Features.push_back("+abs2008");
+        D.Diag(diag::warn_target_unsupported_abslegacy) << CPUName;
+      }
+    } else {
+      D.Diag(diag::err_drv_unsupported_option_argument)
+          << A->getOption().getName() << Val;
+    }
+  }
+
   AddTargetFeature(Args, Features, options::OPT_msingle_float,
                    options::OPT_mdouble_float, "single-float");
   AddTargetFeature(Args, Features, options::OPT_mips16, options::OPT_mno_mips16,
diff --git a/clang/test/Driver/mips-features.c b/clang/test/Driver/mips-features.c
index d240253078e..5f6833e686f 100644
--- a/clang/test/Driver/mips-features.c
+++ b/clang/test/Driver/mips-features.c
@@ -221,6 +221,31 @@
 // RUN:   | FileCheck --check-prefix=CHECK-NANLEGACY %s
 // CHECK-NANLEGACY: "-target-feature" "-nan2008"
 //
+// -mabs=2008 on pre R2
+// RUN: %clang -target mips-linux-gnu -march=mips32 -### -c %s \
+// RUN:     -mabs=2008 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-ABSLEGACY %s
+//
+// -mabs=2008
+// RUN: %clang -target mips-linux-gnu -march=mips32r3 -### -c %s \
+// RUN:     -mabs=2008 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-ABS2008 %s
+//
+// -mabs=legacy
+// RUN: %clang -target mips-linux-gnu -march=mips32r3 -### -c %s \
+// RUN:     -mabs=legacy 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-ABSLEGACY %s
+//
+// -mabs=legacy on R6
+// RUN: %clang -target mips-linux-gnu -march=mips32r6 -### -c %s \
+// RUN:     -mabs=legacy 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-ABS2008 %s
+//
+// CHECK-ABSLEGACY: "-target-feature" "-abs2008"
+// CHECK-ABSLEGACY-NOT: "-target-feature" "+abs2008"
+// CHECK-ABS2008: "-target-feature" "+abs2008"
+// CHECK-ABS2008-NOT: "-target-feature" "-abs2008"
+//
 // -mcompact-branches=never
 // RUN: %clang -target mips-linux-gnu -march=mips32r6 -### -c %s \
 // RUN:     -mcompact-branches=never 2>&1 \
diff --git a/clang/test/Driver/mips-mabs-warning.c b/clang/test/Driver/mips-mabs-warning.c
new file mode 100644
index 00000000000..93175be4ccb
--- /dev/null
+++ b/clang/test/Driver/mips-mabs-warning.c
@@ -0,0 +1,6 @@
+// REQUIRES: mips-registered-target
+// RUN: %clang -c -target mips-unknown-gnu -mcpu=mips32 -mabs=2008 %s 2>&1 | FileCheck -check-prefix=NO2008 %s
+// NO2008: warning: ignoring '-mabs=2008' option because the 'mips32' architecture does not support it [-Wunsupported-abs]
+
+// RUN: %clang -c -target mips-unknown-gnu -mcpu=mips32r6 -mabs=legacy %s 2>&1 | FileCheck -check-prefix=NOLEGACY %s
+// NOLEGACY: warning: ignoring '-mabs=legacy' option because the 'mips32r6' architecture does not support it [-Wunsupported-abs]
diff --git a/clang/test/Preprocessor/init.c b/clang/test/Preprocessor/init.c
index 96c11ef09ff..bae7c0689ba 100644
--- a/clang/test/Preprocessor/init.c
+++ b/clang/test/Preprocessor/init.c
@@ -4860,6 +4860,16 @@
 // RUN:   | FileCheck -match-full-lines -check-prefix NOMIPS-NAN2008 %s
 // NOMIPS-NAN2008-NOT:#define __mips_nan2008 1
 //
+// RUN: %clang_cc1 -target-cpu mips32r3 -target-feature +abs2008 \
+// RUN:   -E -dM -triple=mips-none-none < /dev/null \
+// RUN:   | FileCheck -match-full-lines -check-prefix MIPS-ABS2008 %s
+// MIPS-ABS2008:#define __mips_abs2008 1
+//
+// RUN: %clang_cc1 -target-cpu mips32r3 -target-feature -abs2008 \
+// RUN:   -E -dM -triple=mips-none-none < /dev/null \
+// RUN:   | FileCheck -match-full-lines -check-prefix NOMIPS-ABS2008 %s
+// NOMIPS-ABS2008-NOT:#define __mips_abs2008 1
+//
 // RUN: %clang_cc1 -target-feature -fp64 \
 // RUN:   -E -dM -triple=mips-none-none < /dev/null \
 // RUN:   | FileCheck -match-full-lines -check-prefix MIPS32-MFP32 %s