Index: cfe/trunk/include/clang/Driver/CC1Options.td
===================================================================
--- cfe/trunk/include/clang/Driver/CC1Options.td
+++ cfe/trunk/include/clang/Driver/CC1Options.td
@@ -580,7 +580,7 @@
   HelpText<"OpenCL only. Allow floating-point optimizations that assume arguments and results are not NaNs or +-Inf.">;
 def cl_kernel_arg_info : Flag<["-"], "cl-kernel-arg-info">,
   HelpText<"OpenCL only. Generate kernel argument metadata.">;
-def cl_no_signed_zeros : Flag<["-"], "cl-no-signed-zeros">,
+def : Flag<["-"], "cl-no-signed-zeros">, Alias<fno_signed_zeros>,
   HelpText<"OpenCL only. Allow optimizations to ignore the signedness of the floating-point zero.">;
 def cl_unsafe_math_optimizations : Flag<["-"], "cl-unsafe-math-optimizations">,
   HelpText<"OpenCL only. Allow unsafe floating-point optimizations.  Also implies -cl-no-signed-zeros and -cl-mad-enable">;
Index: cfe/trunk/include/clang/Driver/Options.td
===================================================================
--- cfe/trunk/include/clang/Driver/Options.td
+++ cfe/trunk/include/clang/Driver/Options.td
@@ -566,7 +566,9 @@
 def ffinite_math_only : Flag<["-"], "ffinite-math-only">, Group<f_Group>, Flags<[CC1Option]>;
 def fno_finite_math_only : Flag<["-"], "fno-finite-math-only">, Group<f_Group>;
 def fsigned_zeros : Flag<["-"], "fsigned-zeros">, Group<f_Group>;
-def fno_signed_zeros : Flag<["-"], "fno-signed-zeros">, Group<f_Group>;
+def fno_signed_zeros :
+  Flag<["-"], "fno-signed-zeros">, Group<f_Group>, Flags<[CC1Option]>,
+  HelpText<"Allow optimizations that ignore the sign of floating point zeros">;
 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>;
Index: cfe/trunk/lib/Driver/Tools.cpp
===================================================================
--- cfe/trunk/lib/Driver/Tools.cpp
+++ cfe/trunk/lib/Driver/Tools.cpp
@@ -2955,6 +2955,8 @@
       !TrappingMath)
     CmdArgs.push_back("-menable-unsafe-fp-math");
 
+  if (!SignedZeros)
+    CmdArgs.push_back("-fno-signed-zeros");
 
   // Validate and pass through -fp-contract option. 
   if (Arg *A = Args.getLastArg(options::OPT_ffast_math, FastMathAliasOption,
Index: cfe/trunk/lib/Frontend/CompilerInvocation.cpp
===================================================================
--- cfe/trunk/lib/Frontend/CompilerInvocation.cpp
+++ cfe/trunk/lib/Frontend/CompilerInvocation.cpp
@@ -441,7 +441,7 @@
                        Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
                        Args.hasArg(OPT_cl_finite_math_only) ||
                        Args.hasArg(OPT_cl_fast_relaxed_math));
-  Opts.NoSignedZeros = Args.hasArg(OPT_cl_no_signed_zeros);
+  Opts.NoSignedZeros = Args.hasArg(OPT_fno_signed_zeros);
   Opts.NoZeroInitializedInBSS = Args.hasArg(OPT_mno_zero_initialized_in_bss);
   Opts.BackendOptions = Args.getAllArgValues(OPT_backend_option);
   Opts.NumRegisterParameters = getLastArgIntValue(Args, OPT_mregparm, 0, Diags);
Index: cfe/trunk/test/CodeGen/finite-math.c
===================================================================
--- cfe/trunk/test/CodeGen/finite-math.c
+++ cfe/trunk/test/CodeGen/finite-math.c
@@ -1,11 +1,15 @@
-// RUN: %clang_cc1 -ffinite-math-only -emit-llvm -o - %s | FileCheck %s
+// RUN: %clang_cc1 -ffinite-math-only -emit-llvm -o - %s | FileCheck %s -check-prefix=CHECK -check-prefix=FINITE
+// RUN: %clang_cc1 -fno-signed-zeros -emit-llvm -o - %s | FileCheck %s -check-prefix=CHECK  -check-prefix=NSZ
+
 float f0, f1, f2;
 
 void foo(void) {
   // CHECK-LABEL: define void @foo()
 
-  // CHECK: fadd nnan ninf
+  // FINITE: fadd nnan ninf
+  // NSZ: fadd nsz
   f0 = f1 + f2;
 
   // CHECK: ret
 }
+
Index: cfe/trunk/test/Driver/fast-math.c
===================================================================
--- cfe/trunk/test/Driver/fast-math.c
+++ cfe/trunk/test/Driver/fast-math.c
@@ -25,6 +25,21 @@
 // CHECK-NO-INFS-NO-FAST-MATH: "-cc1"
 // CHECK-NO-INFS-NO-FAST-MATH-NOT: "-menable-no-infs"
 //
+// RUN: %clang -### -fno-signed-zeros -c %s 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-NO-SIGNED-ZEROS %s
+// CHECK-NO-SIGNED-ZEROS: "-cc1"
+// CHECK-NO-SIGNED-ZEROS: "-fno-signed-zeros"
+//
+// RUN: %clang -### -fno-fast-math -fno-signed-zeros -c %s 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-NO-FAST-MATH-NO-SIGNED-ZEROS %s
+// CHECK-NO-FAST-MATH-NO-SIGNED-ZEROS: "-cc1"
+// CHECK-NO-FAST-MATH-NO-SIGNED-ZEROS: "-fno-signed-zeros"
+//
+// RUN: %clang -### -fno-signed-zeros -fno-fast-math -c %s 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-NO-SIGNED-ZEROS-NO-FAST-MATH %s
+// CHECK-NO-SIGNED-ZEROS-NO-FAST-MATH: "-cc1"
+// CHECK-NO-SIGNED-ZEROS-NO-FAST-MATH-NOT: "-fno-signed-zeros"
+//
 // RUN: %clang -### -fno-honor-nans -c %s 2>&1 \
 // RUN:   | FileCheck --check-prefix=CHECK-NO-NANS %s
 // CHECK-NO-NANS: "-cc1"