Index: llvm/trunk/lib/CodeGen/TargetLoweringBase.cpp
===================================================================
--- llvm/trunk/lib/CodeGen/TargetLoweringBase.cpp
+++ llvm/trunk/lib/CodeGen/TargetLoweringBase.cpp
@@ -97,7 +97,7 @@
     Names[RTLIB::FPROUND_F32_F16] = "__gnu_f2h_ieee";
   }
 
-  if (TT.isGNUEnvironment()) {
+  if (TT.isGNUEnvironment() || TT.isOSFuchsia()) {
     Names[RTLIB::SINCOS_F32] = "sincosf";
     Names[RTLIB::SINCOS_F64] = "sincos";
     Names[RTLIB::SINCOS_F80] = "sincosl";
Index: llvm/trunk/lib/Target/X86/X86Subtarget.cpp
===================================================================
--- llvm/trunk/lib/Target/X86/X86Subtarget.cpp
+++ llvm/trunk/lib/Target/X86/X86Subtarget.cpp
@@ -189,9 +189,12 @@
 }
 
 bool X86Subtarget::hasSinCos() const {
-  return getTargetTriple().isMacOSX() &&
-    !getTargetTriple().isMacOSXVersionLT(10, 9) &&
-    is64Bit();
+  if (getTargetTriple().isMacOSX()) {
+    return !getTargetTriple().isMacOSXVersionLT(10, 9) && is64Bit();
+  } else if (getTargetTriple().isOSFuchsia()) {
+    return true;
+  }
+  return false;
 }
 
 /// Return true if the subtarget allows calls to immediate address.
Index: llvm/trunk/test/CodeGen/X86/sincos-opt.ll
===================================================================
--- llvm/trunk/test/CodeGen/X86/sincos-opt.ll
+++ llvm/trunk/test/CodeGen/X86/sincos-opt.ll
@@ -3,6 +3,8 @@
 ; RUN: llc < %s -mtriple=x86_64-pc-linux-gnu -mcpu=core2 | FileCheck %s --check-prefix=GNU_SINCOS
 ; RUN: llc < %s -mtriple=x86_64-pc-linux-gnu -mcpu=core2 -enable-unsafe-fp-math | FileCheck %s --check-prefix=GNU_SINCOS_FASTMATH
 ; RUN: llc < %s -mtriple=x86_64-pc-linux-gnux32 -mcpu=core2 -enable-unsafe-fp-math | FileCheck %s --check-prefix=GNU_SINCOS_FASTMATH
+; RUN: llc < %s -mtriple=x86_64-fuchsia -mcpu=core2 | FileCheck %s --check-prefix=GNU_SINCOS
+; RUN: llc < %s -mtriple=x86_64-fuchsia -mcpu=core2 -enable-unsafe-fp-math | FileCheck %s --check-prefix=GNU_SINCOS_FASTMATH
 
 ; Combine sin / cos into a single call unless they may write errno (as
 ; captured by readnone attrbiute, controlled by clang -fmath-errno