diff --git a/llvm/include/llvm/Analysis/TargetLibraryInfo.def b/llvm/include/llvm/Analysis/TargetLibraryInfo.def
index 5914324b286c05..ebc917ea53eb8d 100644
--- a/llvm/include/llvm/Analysis/TargetLibraryInfo.def
+++ b/llvm/include/llvm/Analysis/TargetLibraryInfo.def
@@ -2183,6 +2183,21 @@ TLI_DEFINE_ENUM_INTERNAL(sinl)
 TLI_DEFINE_STRING_INTERNAL("sinl")
 TLI_DEFINE_SIG_INTERNAL(LDbl, LDbl)
 
+/// void sincos(double x, double *sin_out, double *cos_out);
+TLI_DEFINE_ENUM_INTERNAL(sincos)
+TLI_DEFINE_STRING_INTERNAL("sincos")
+TLI_DEFINE_SIG_INTERNAL(Void, Dbl, Ptr, Ptr)
+
+/// void sincosf(float x, float *sin_out, float *cos_out);
+TLI_DEFINE_ENUM_INTERNAL(sincosf)
+TLI_DEFINE_STRING_INTERNAL("sincosf")
+TLI_DEFINE_SIG_INTERNAL(Void, Flt, Ptr, Ptr)
+
+/// void sincosl(long double x, long double *sin_out, long double *cos_out);
+TLI_DEFINE_ENUM_INTERNAL(sincosl)
+TLI_DEFINE_STRING_INTERNAL("sincosl")
+TLI_DEFINE_SIG_INTERNAL(Void, LDbl, Ptr, Ptr)
+
 /// int siprintf(char *str, const char *format, ...);
 TLI_DEFINE_ENUM_INTERNAL(siprintf)
 TLI_DEFINE_STRING_INTERNAL("siprintf")
diff --git a/llvm/lib/Transforms/Utils/BuildLibCalls.cpp b/llvm/lib/Transforms/Utils/BuildLibCalls.cpp
index b0da19813f0a4b..f6448883287587 100644
--- a/llvm/lib/Transforms/Utils/BuildLibCalls.cpp
+++ b/llvm/lib/Transforms/Utils/BuildLibCalls.cpp
@@ -1270,6 +1270,18 @@ bool llvm::inferNonMandatoryLibFuncAttrs(Function &F,
     Changed |= setOnlyWritesMemory(F);
     Changed |= setWillReturn(F);
     break;
+  case LibFunc_sincos:
+  case LibFunc_sincosf:
+  case LibFunc_sincosl:
+    Changed |= setDoesNotThrow(F);
+    Changed |= setDoesNotFreeMemory(F);
+    Changed |= setOnlyWritesMemory(F);
+    Changed |= setOnlyWritesMemory(F, 1);
+    Changed |= setOnlyWritesMemory(F, 2);
+    Changed |= setDoesNotCapture(F, 1);
+    Changed |= setDoesNotCapture(F, 2);
+    Changed |= setWillReturn(F);
+    break;
   default:
     // FIXME: It'd be really nice to cover all the library functions we're
     // aware of here.
diff --git a/llvm/test/Transforms/InferFunctionAttrs/annotate.ll b/llvm/test/Transforms/InferFunctionAttrs/annotate.ll
index bc0d7a509e1f5d..40c512c81f0c9d 100644
--- a/llvm/test/Transforms/InferFunctionAttrs/annotate.ll
+++ b/llvm/test/Transforms/InferFunctionAttrs/annotate.ll
@@ -1106,6 +1106,15 @@ declare void @__cxa_throw(ptr, ptr, ptr)
 ; CHECK: declare void @_ZSt9terminatev() [[NOFREE_COLD_NORETURN:#[0-9]+]]
 declare void @_ZSt9terminatev()
 
+; CHECK: declare void @sincos(double, ptr nocapture writeonly, ptr nocapture writeonly) [[NOFREE_NOUNWIND_WILLRETURN_WRITEONLY]]
+declare void @sincos(double, ptr, ptr)
+
+; CHECK: declare void @sincosf(float, ptr nocapture writeonly, ptr nocapture writeonly) [[NOFREE_NOUNWIND_WILLRETURN_WRITEONLY]]
+declare void @sincosf(float, ptr, ptr)
+
+; CHECK: declare void @sincosl(x86_fp80, ptr nocapture writeonly, ptr nocapture writeonly) [[NOFREE_NOUNWIND_WILLRETURN_WRITEONLY]]
+declare void @sincosl(x86_fp80, ptr, ptr)
+
 ; memset_pattern{4,8,16} aren't available everywhere.
 ; CHECK-DARWIN: declare void @memset_pattern4(ptr nocapture writeonly, ptr nocapture readonly, i64) [[ARGMEMONLY_NOFREE_NOUNWIND_WILLRETURN]]
 declare void @memset_pattern4(ptr, ptr, i64)
diff --git a/llvm/test/tools/llvm-tli-checker/ps4-tli-check.yaml b/llvm/test/tools/llvm-tli-checker/ps4-tli-check.yaml
index 47aeb0ad8fdef9..26efb2bc97cd14 100644
--- a/llvm/test/tools/llvm-tli-checker/ps4-tli-check.yaml
+++ b/llvm/test/tools/llvm-tli-checker/ps4-tli-check.yaml
@@ -34,7 +34,7 @@
 #
 # CHECK: << Total TLI yes SDK no:  18
 # CHECK: >> Total TLI no  SDK yes: 0
-# CHECK: == Total TLI yes SDK yes: 250
+# CHECK: == Total TLI yes SDK yes: 253
 #
 # WRONG_DETAIL: << TLI yes SDK no : '_ZdaPv' aka operator delete[](void*)
 # WRONG_DETAIL: >> TLI no  SDK yes: '_ZdaPvj' aka operator delete[](void*, unsigned int)
@@ -48,14 +48,14 @@
 # WRONG_DETAIL: << TLI yes SDK no : 'fminimum_numl'
 # WRONG_SUMMARY: << Total TLI yes SDK no:  19{{$}}
 # WRONG_SUMMARY: >> Total TLI no  SDK yes: 1{{$}}
-# WRONG_SUMMARY: == Total TLI yes SDK yes: 249
+# WRONG_SUMMARY: == Total TLI yes SDK yes: 252
 #
 ## The -COUNT suffix doesn't care if there are too many matches, so check
 ## the exact count first; the two directives should add up to that.
 ## Yes, this means additions to TLI will fail this test, but the argument
 ## to -COUNT can't be an expression.
-# AVAIL: TLI knows 501 symbols, 268 available
-# AVAIL-COUNT-268: {{^}} available
+# AVAIL: TLI knows 504 symbols, 271 available
+# AVAIL-COUNT-271: {{^}} available
 # AVAIL-NOT:       {{^}} available
 # UNAVAIL-COUNT-233: not available
 # UNAVAIL-NOT:       not available
@@ -862,6 +862,18 @@ DynamicSymbols:
     Type:            STT_FUNC
     Section:         .text
     Binding:         STB_GLOBAL
+  - Name:            sincos
+    Type:            STT_FUNC
+    Section:         .text
+    Binding:         STB_GLOBAL
+  - Name:            sincosf
+    Type:            STT_FUNC
+    Section:         .text
+    Binding:         STB_GLOBAL
+  - Name:            sincosl
+    Type:            STT_FUNC
+    Section:         .text
+    Binding:         STB_GLOBAL
   - Name:            sinh
     Type:            STT_FUNC
     Section:         .text
diff --git a/llvm/unittests/Analysis/TargetLibraryInfoTest.cpp b/llvm/unittests/Analysis/TargetLibraryInfoTest.cpp
index c081c44ed35d00..ac8ccc03399e14 100644
--- a/llvm/unittests/Analysis/TargetLibraryInfoTest.cpp
+++ b/llvm/unittests/Analysis/TargetLibraryInfoTest.cpp
@@ -339,6 +339,9 @@ TEST_F(TargetLibraryInfoTest, ValidProto) {
       "declare float @sinhf(float)\n"
       "declare x86_fp80 @sinhl(x86_fp80)\n"
       "declare x86_fp80 @sinl(x86_fp80)\n"
+      "declare void @sincos(double, ptr, ptr)\n"
+      "declare void @sincosf(float, ptr, ptr)\n"
+      "declare void @sincosl(x86_fp80, ptr, ptr)\n"
       "declare i32 @snprintf(i8*, i64, i8*, ...)\n"
       "declare i32 @sprintf(i8*, i8*, ...)\n"
       "declare double @sqrt(double)\n"