diff --git a/gcc/config/i386/sse.md b/gcc/config/i386/sse.md
index 66062dc3bcf..a48c8e8bede 100644
--- a/gcc/config/i386/sse.md
+++ b/gcc/config/i386/sse.md
@@ -6328,6 +6328,12 @@ (define_mode_attr ph2pssuffix
   [(V16SF "x") (V8SF "x") (V4SF "x")
    (V8DF "") (V4DF "") (V2DF "")])
 
+(define_expand "extend<ssePHmodelower><mode>2"
+  [(set (match_operand:VF48H_AVX512VL 0 "register_operand")
+	(float_extend:VF48H_AVX512VL
+	  (match_operand:<ssePHmode> 1 "nonimmediate_operand")))]
+  "TARGET_AVX512FP16")
+
 (define_insn "avx512fp16_float_extend_ph<mode>2<mask_name><round_saeonly_name>"
   [(set (match_operand:VF48H_AVX512VL 0 "register_operand" "=v")
 	(float_extend:VF48H_AVX512VL
@@ -6338,6 +6344,21 @@ (define_insn "avx512fp16_float_extend_ph<mode>2<mask_name><round_saeonly_name>"
    (set_attr "prefix" "evex")
    (set_attr "mode" "<sseinsnmode>")])
 
+(define_expand "extendv4hf<mode>2"
+  [(set (match_operand:VF4_128_8_256 0 "register_operand")
+	(float_extend:VF4_128_8_256
+	  (match_operand:V4HF 1 "nonimmediate_operand")))]
+  "TARGET_AVX512FP16 && TARGET_AVX512VL"
+{
+  if (!MEM_P (operands[1]))
+    {
+      operands[1] = lowpart_subreg (V8HFmode, operands[1], V4HFmode);
+      emit_insn (gen_avx512fp16_float_extend_ph<mode>2
+		 (operands[0], operands[1]));
+      DONE;
+    }
+})
+
 (define_insn "avx512fp16_float_extend_ph<mode>2<mask_name>"
   [(set (match_operand:VF4_128_8_256 0 "register_operand" "=v")
 	(float_extend:VF4_128_8_256
@@ -6360,6 +6381,21 @@ (define_insn "*avx512fp16_float_extend_ph<mode>2_load<mask_name>"
    (set_attr "prefix" "evex")
    (set_attr "mode" "<sseinsnmode>")])
 
+(define_expand "extendv2hfv2df2"
+  [(set (match_operand:V2DF 0 "register_operand")
+	(float_extend:V2DF
+	  (match_operand:V2HF 1 "nonimmediate_operand")))]
+  "TARGET_AVX512FP16 && TARGET_AVX512VL"
+{
+  if (!MEM_P (operands[1]))
+    {
+      operands[1] = lowpart_subreg (V8HFmode, operands[1], V2HFmode);
+      emit_insn (gen_avx512fp16_float_extend_phv2df2
+		 (operands[0], operands[1]));
+      DONE;
+    }
+})
+
 (define_insn "avx512fp16_float_extend_phv2df2<mask_name>"
   [(set (match_operand:V2DF 0 "register_operand" "=v")
 	(float_extend:V2DF
@@ -6382,6 +6418,12 @@ (define_insn "*avx512fp16_float_extend_phv2df2_load<mask_name>"
    (set_attr "prefix" "evex")
    (set_attr "mode" "TI")])
 
+(define_expand "trunc<mode><ssePHmodelower>2"
+  [(set (match_operand:<ssePHmode> 0 "register_operand")
+	(float_truncate:<ssePHmode>
+	  (match_operand:VF48H_AVX512VL 1 "nonimmediate_operand")))]
+  "TARGET_AVX512FP16")
+
 (define_insn "avx512fp16_vcvt<castmode>2ph_<mode><mask_name><round_name>"
   [(set (match_operand:<ssePHmode> 0 "register_operand" "=v")
 	(float_truncate:<ssePHmode>
@@ -6392,11 +6434,21 @@ (define_insn "avx512fp16_vcvt<castmode>2ph_<mode><mask_name><round_name>"
    (set_attr "prefix" "evex")
    (set_attr "mode" "<sseinsnmode>")])
 
-(define_expand "avx512fp16_vcvt<castmode>2ph_<mode>"
-  [(set (match_operand:V8HF 0 "register_operand" "=v")
+(define_expand "trunc<mode>v4hf2"
+  [(set (match_operand:V4HF 0 "register_operand")
+	(float_truncate:V4HF (match_operand:VF4_128_8_256 1 "vector_operand")))]
+  "TARGET_AVX512FP16 && TARGET_AVX512VL"
+{
+  operands[0] = lowpart_subreg (V8HFmode, operands[0], V4HFmode);
+  emit_insn (gen_avx512fp16_trunc<mode>v4hf2 (operands[0], operands[1]));
+  DONE;
+})
+
+(define_expand "avx512fp16_trunc<mode>v4hf2"
+  [(set (match_operand:V8HF 0 "register_operand")
 	(vec_concat:V8HF
 	    (float_truncate:V4HF
-	      (match_operand:VF4_128_8_256 1 "vector_operand" "vm"))
+	      (match_operand:VF4_128_8_256 1 "vector_operand"))
 	    (match_dup 2)))]
   "TARGET_AVX512FP16 && TARGET_AVX512VL"
   "operands[2] = CONST0_RTX (V4HFmode);")
@@ -6461,11 +6513,20 @@ (define_insn "*avx512fp16_vcvt<castmode>2ph_<mode>_mask_1"
    (set_attr "prefix" "evex")
    (set_attr "mode" "<sseinsnmode>")])
 
-(define_expand "avx512fp16_vcvtpd2ph_v2df"
-  [(set (match_operand:V8HF 0 "register_operand" "=v")
+(define_expand "truncv2dfv2hf2"
+  [(set (match_operand:V2HF 0 "register_operand")
+	(float_truncate:V2HF (match_operand:V2DF 1 "vector_operand")))]
+  "TARGET_AVX512FP16 && TARGET_AVX512VL"
+{
+  operands[0] = lowpart_subreg (V8HFmode, operands[0], V2HFmode);
+  emit_insn (gen_avx512fp16_truncv2dfv2hf2 (operands[0], operands[1]));
+  DONE;
+})
+
+(define_expand "avx512fp16_truncv2dfv2hf2"
+  [(set (match_operand:V8HF 0 "register_operand")
 	(vec_concat:V8HF
-	  (float_truncate:V2HF
-	    (match_operand:V2DF 1 "vector_operand" "vm"))
+	  (float_truncate:V2HF (match_operand:V2DF 1 "vector_operand"))
 	  (match_dup 2)))]
   "TARGET_AVX512FP16 && TARGET_AVX512VL"
   "operands[2] = CONST0_RTX (V6HFmode);")
diff --git a/gcc/testsuite/gcc.target/i386/avx512fp16-trunc-extendvnhf.c b/gcc/testsuite/gcc.target/i386/avx512fp16-trunc-extendvnhf.c
new file mode 100644
index 00000000000..286ea9f2624
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/avx512fp16-trunc-extendvnhf.c
@@ -0,0 +1,55 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -mavx512fp16 -mavx512vl -ftree-slp-vectorize -mprefer-vector-width=512" } */
+
+extern double df[8];
+extern float sf[16];
+extern _Float16 hf[32];
+
+#define DO_PRAGMA(X) _Pragma(#X)
+
+#define TRUNCHFVV(size, mode)	    \
+  void __attribute__ ((noinline, noclone))  \
+truncv##size##mode##v##size##hf ()   \
+{\
+  int i;  \
+  DO_PRAGMA (GCC unroll size)	\
+  for (i = 0; i < size; i++)  \
+    hf[i] = mode[i];  \
+}
+
+#define EXTENDHFVV(size, mode)	    \
+  void __attribute__ ((noinline, noclone))  \
+extendv##size##hf##v##size##mode ()   \
+{\
+  int i;  \
+  DO_PRAGMA (GCC unroll size)	\
+  for (i = 0; i < size; i++)  \
+    mode[i] = hf[i];  \
+}
+
+TRUNCHFVV(8, df)
+TRUNCHFVV(4, df)
+TRUNCHFVV(2, df)
+TRUNCHFVV(16, sf)
+TRUNCHFVV(8, sf)
+TRUNCHFVV(4, sf)
+EXTENDHFVV(8, df)
+EXTENDHFVV(4, df)
+EXTENDHFVV(2, df)
+EXTENDHFVV(16, sf)
+EXTENDHFVV(8, sf)
+EXTENDHFVV(4, sf)
+
+/* { dg-final { scan-assembler-times "vcvtpd2phz\[ \\t\]+\[^\{\n\]*\[^\n\r]*%xmm\[0-9\]+(?:\n|\[ \\t\]+#)" 1 } } */
+/* { dg-final { scan-assembler-times "vcvtpd2phy\[ \\t\]+\[^\{\n\]*\[^\n\r]*%xmm\[0-9\]+(?:\n|\[ \\t\]+#)" 1 { xfail *-*-* } } } */
+/* { dg-final { scan-assembler-times "vcvtpd2phx\[ \\t\]+\[^\{\n\]*\[^\n\r]*%xmm\[0-9\]+(?:\n|\[ \\t\]+#)" 1 { xfail *-*-* } } } */
+/* { dg-final { scan-assembler-times "vcvtps2phx\[ \\t\]+\[^\{\n\]*\[^\n\r]*%ymm\[0-9\]+(?:\n|\[ \\t\]+#)" 1 } } */
+/* { dg-final { scan-assembler-times "vcvtps2phxy\[ \\t\]+\[^\{\n\]*\[^\n\r]*%xmm\[0-9\]+(?:\n|\[ \\t\]+#)" 1 } } */
+/* { dg-final { scan-assembler-times "vcvtps2phxx\[ \\t\]+\[^\{\n\]*\[^\n\r]*%xmm\[0-9\]+(?:\n|\[ \\t\]+#)" 1 { xfail *-*-* } } } */
+/* { dg-final { scan-assembler-times "vcvtph2pd\[ \\t\]+\[^\{\n\]*\[^\n\r]*%zmm\[0-9\]+(?:\n|\[ \\t\]+#)" 1 } } */
+/* { dg-final { scan-assembler-times "vcvtph2pd\[ \\t\]+\[^\{\n\]*\[^\n\r]*%ymm\[0-9\]+(?:\n|\[ \\t\]+#)" 1 { xfail *-*-* } } } */
+/* { dg-final { scan-assembler-times "vcvtph2pd\[ \\t\]+\[^\{\n\]*\[^\n\r]*%xmm\[0-9\]+(?:\n|\[ \\t\]+#)" 1 { xfail *-*-* } } } */
+/* { dg-final { scan-assembler-times "vcvtph2psx\[ \\t\]+\[^\{\n\]*\[^\n\r]*%zmm\[0-9\]+(?:\n|\[ \\t\]+#)" 1 } } */
+/* { dg-final { scan-assembler-times "vcvtph2psx\[ \\t\]+\[^\{\n\]*\[^\n\r]*%ymm\[0-9\]+(?:\n|\[ \\t\]+#)" 1 } } */
+/* { dg-final { scan-assembler-times "vcvtph2psx\[ \\t\]+\[^\{\n\]*\[^\n\r]*%xmm\[0-9\]+(?:\n|\[ \\t\]+#)" 1 { xfail *-*-* } } } */
+
