Index: include/clang/Basic/BuiltinsX86.def
===================================================================
--- include/clang/Basic/BuiltinsX86.def
+++ include/clang/Basic/BuiltinsX86.def
@@ -1962,6 +1962,14 @@
 TARGET_BUILTIN(__builtin_ia32_rsqrt14pd256_mask, "V4dV4dV4dUc","","avx512vl")
 TARGET_BUILTIN(__builtin_ia32_rsqrt14ps128_mask, "V4fV4fV4fUc","","avx512vl")
 TARGET_BUILTIN(__builtin_ia32_rsqrt14ps256_mask, "V8fV8fV8fUc","","avx512vl")
+TARGET_BUILTIN(__builtin_ia32_expanddf512_mask, "V8dV8dV8dUc","","avx512f")
+TARGET_BUILTIN(__builtin_ia32_expanddi512_mask, "V8LLiV8LLiV8LLiUc","","avx512f")
+TARGET_BUILTIN(__builtin_ia32_expandloaddf512_mask, "V8dvC*V8dUc","","avx512f")
+TARGET_BUILTIN(__builtin_ia32_expandloaddi512_mask, "V8LLivC*V8LLiUc","","avx512f")
+TARGET_BUILTIN(__builtin_ia32_expandloadsf512_mask, "V16fvC*V16fUs","","avx512f")
+TARGET_BUILTIN(__builtin_ia32_expandloadsi512_mask, "V16ivC*V16iUs","","avx512f")
+TARGET_BUILTIN(__builtin_ia32_expandsf512_mask, "V16fV16fV16fUs","","avx512f")
+TARGET_BUILTIN(__builtin_ia32_expandsi512_mask, "V16iV16iV16iUs","","avx512f")
 
 #undef BUILTIN
 #undef TARGET_BUILTIN
Index: lib/Headers/avx512fintrin.h
===================================================================
--- lib/Headers/avx512fintrin.h
+++ lib/Headers/avx512fintrin.h
@@ -5619,6 +5619,70 @@
                  __R);\
 })
 
+static __inline__ __m512d __DEFAULT_FN_ATTRS
+_mm512_mask_expand_pd (__m512d __W, __mmask8 __U, __m512d __A)
+{
+  return (__m512d) __builtin_ia32_expanddf512_mask ((__v8df) __A,
+                (__v8df) __W,
+                (__mmask8) __U);
+}
+
+static __inline__ __m512i __DEFAULT_FN_ATTRS
+_mm512_mask_expand_epi64 (__m512i __W, __mmask8 __U, __m512i __A)
+{
+  return (__m512i) __builtin_ia32_expanddi512_mask ((__v8di) __A,
+                (__v8di) __W,
+                (__mmask8) __U);
+}
+
+static __inline__ __m512d __DEFAULT_FN_ATTRS
+_mm512_mask_expandloadu_pd(__m512d __W, __mmask8 __U, void const *__P)
+{
+  return (__m512d) __builtin_ia32_expandloaddf512_mask ((const __v8df *)__P,
+              (__v8df) __W,
+              (__mmask8) __U);
+}
+
+static __inline__ __m512i __DEFAULT_FN_ATTRS
+_mm512_mask_expandloadu_epi64(__m512i __W, __mmask8 __U, void const *__P)
+{
+  return (__m512i) __builtin_ia32_expandloaddi512_mask ((const __v8di *)__P,
+              (__v8di) __W,
+              (__mmask8) __U);
+}
+
+static __inline__ __m512 __DEFAULT_FN_ATTRS
+_mm512_mask_expandloadu_ps(__m512 __W, __mmask16 __U, void const *__P)
+{
+  return (__m512) __builtin_ia32_expandloadsf512_mask ((const __v16sf *)__P,
+                   (__v16sf) __W,
+                   (__mmask16) __U);
+}
+
+static __inline__ __m512i __DEFAULT_FN_ATTRS
+_mm512_mask_expandloadu_epi32(__m512i __W, __mmask16 __U, void const *__P)
+{
+  return (__m512i) __builtin_ia32_expandloadsi512_mask ((const __v16si *)__P,
+              (__v16si) __W,
+              (__mmask16) __U);
+}
+
+static __inline__ __m512 __DEFAULT_FN_ATTRS
+_mm512_mask_expand_ps (__m512 __W, __mmask16 __U, __m512 __A)
+{
+  return (__m512) __builtin_ia32_expandsf512_mask ((__v16sf) __A,
+               (__v16sf) __W,
+               (__mmask16) __U);
+}
+
+static __inline__ __m512i __DEFAULT_FN_ATTRS
+_mm512_mask_expand_epi32 (__m512i __W, __mmask16 __U, __m512i __A)
+{
+  return (__m512i) __builtin_ia32_expandsi512_mask ((__v16si) __A,
+                (__v16si) __W,
+                (__mmask16) __U);
+}
+
 #undef __DEFAULT_FN_ATTRS
 
 #endif // __AVX512FINTRIN_H
Index: test/CodeGen/avx512f-builtins.c
===================================================================
--- test/CodeGen/avx512f-builtins.c
+++ test/CodeGen/avx512f-builtins.c
@@ -3700,4 +3700,50 @@
     return _mm_maskz_sqrt_round_ss(__U,__A,__B,_MM_FROUND_CUR_DIRECTION);
 }
 
+__m512d test_mm512_mask_expand_pd(__m512d __W, __mmask8 __U, __m512d __A) {
+  // CHECK-LABEL: @test_mm512_mask_expand_pd
+  // CHECK: @llvm.x86.avx512.mask.expand.pd.512
+  return _mm512_mask_expand_pd(__W, __U, __A); 
+}
+
+__m512i test_mm512_mask_expand_epi64(__m512i __W, __mmask8 __U, __m512i __A) {
+  // CHECK-LABEL: @test_mm512_mask_expand_epi64
+  // CHECK: @llvm.x86.avx512.mask.expand.q.512
+  return _mm512_mask_expand_epi64(__W, __U, __A); 
+}
+
+__m512d test_mm512_mask_expandloadu_pd(__m512d __W, __mmask8 __U, void const *__P) {
+  // CHECK-LABEL: @test_mm512_mask_expandloadu_pd
+  // CHECK: @llvm.x86.avx512.mask.expand.load.pd.512
+  return _mm512_mask_expandloadu_pd(__W, __U, __P); 
+}
+
+__m512i test_mm512_mask_expandloadu_epi64(__m512i __W, __mmask8 __U, void const *__P) {
+  // CHECK-LABEL: @test_mm512_mask_expandloadu_epi64
+  // CHECK: @llvm.x86.avx512.mask.expand.load.q.512
+  return _mm512_mask_expandloadu_epi64(__W, __U, __P); 
+}
 
+__m512d test_mm512_mask_expandloadu_pd(__m512d __W, __mmask8 __U, void const *__P) {
+  // CHECK-LABEL: @test_mm512_mask_expandloadu_pd
+  // CHECK: @llvm.x86.avx512.mask.expand.load.pd.512
+  return _mm512_mask_expandloadu_pd(__W, __U, __P); 
+}
+
+__m512i test_mm512_mask_expandloadu_epi32(__m512i __W, __mmask16 __U, void const *__P) {
+  // CHECK-LABEL: @test_mm512_mask_expandloadu_epi32
+  // CHECK: @llvm.x86.avx512.mask.expand.load.d.512
+  return _mm512_mask_expandloadu_epi32(__W, __U, __P); 
+}
+
+__m512 test_mm512_mask_expand_ps(__m512 __W, __mmask16 __U, __m512 __A) {
+  // CHECK-LABEL: @test_mm512_mask_expand_ps
+  // CHECK: @llvm.x86.avx512.mask.expand.ps.512
+  return _mm512_mask_expand_ps(__W, __U, __A); 
+}
+
+__m512i test_mm512_mask_expand_epi32(__m512i __W, __mmask16 __U, __m512i __A) {
+  // CHECK-LABEL: @test_mm512_mask_expand_epi32
+  // CHECK: @llvm.x86.avx512.mask.expand.d.512
+  return _mm512_mask_expand_epi32(__W, __U, __A); 
+}