Index: include/clang/Basic/BuiltinsX86.def
===================================================================
--- include/clang/Basic/BuiltinsX86.def
+++ include/clang/Basic/BuiltinsX86.def
@@ -1719,6 +1719,8 @@
 TARGET_BUILTIN(__builtin_ia32_movddup512_mask, "V8dV8dV8dUc","","avx512f")
 TARGET_BUILTIN(__builtin_ia32_movddup128_mask, "V2dV2dV2dUc","","avx512vl")
 TARGET_BUILTIN(__builtin_ia32_movddup256_mask, "V4dV4dV4dUc","","avx512vl")
+TARGET_BUILTIN(__builtin_ia32_vcomisd, "iV2dV2dIiIi","","avx512f")
+TARGET_BUILTIN(__builtin_ia32_vcomiss, "iV4fV4fIiIi","","avx512f")
 
 #undef BUILTIN
 #undef TARGET_BUILTIN
Index: lib/Headers/avx512fintrin.h
===================================================================
--- lib/Headers/avx512fintrin.h
+++ lib/Headers/avx512fintrin.h
@@ -3695,6 +3695,14 @@
                (__mmask8) __U);
 }
 
+#define _mm_comi_round_sd(__A, __B, __P, __R) __extension__ ({\
+__builtin_ia32_vcomisd ((__v2df) (__A), (__v2df) (__B), ( __P), (  __R));\
+})
+
+#define _mm_comi_round_ss( __A,  __B, __P, __R) __extension__ ({\
+__builtin_ia32_vcomiss ((__v4sf) (__A), (__v4sf) (__B), ( __P), ( __R));\
+})
+
 
 #undef __DEFAULT_FN_ATTRS
 
Index: test/CodeGen/avx512f-builtins.c
===================================================================
--- test/CodeGen/avx512f-builtins.c
+++ test/CodeGen/avx512f-builtins.c
@@ -2364,4 +2364,14 @@
   return _mm512_maskz_movedup_pd(__U, __A); 
 }
 
+int test_mm_comi_round_sd(__m128d __A, __m128d __B) {
+  // CHECK-LABEL: @test_mm_comi_round_sd
+  // CHECK: @llvm.x86.avx512.vcomi.sd
+  return _mm_comi_round_sd(__A, __B, 5, 3); 
+}
 
+int test_mm_comi_round_ss(__m128 __A, __m128 __B) {
+  // CHECK-LABEL: @test_mm_comi_round_ss
+  // CHECK: @llvm.x86.avx512.vcomi.ss
+  return _mm_comi_round_ss(__A, __B, 5, 3); 
+}