diff --git a/gcc/config/i386/avx512fp16intrin.h b/gcc/config/i386/avx512fp16intrin.h
index b1913b98931..c0fb9ff2538 100644
--- a/gcc/config/i386/avx512fp16intrin.h
+++ b/gcc/config/i386/avx512fp16intrin.h
@@ -721,6 +721,33 @@ _mm512_maskz_div_round_ph (__mmask32 __A, __m512h __B, __m512h __C,
 					       (A), (D)))
 #endif  /* __OPTIMIZE__  */
 
+extern __inline __m512h
+__attribute__ ((__gnu_inline__, __always_inline__, __artificial__))
+_mm512_conj_pch (__m512h __A)
+{
+  return (__m512h) _mm512_xor_epi32 ((__m512i) __A, _mm512_set1_epi32 (1<<31));
+}
+
+extern __inline __m512h
+__attribute__ ((__gnu_inline__, __always_inline__, __artificial__))
+_mm512_mask_conj_pch (__m512h __W, __mmask16 __U, __m512h __A)
+{
+  return (__m512h)
+    __builtin_ia32_movaps512_mask ((__v16sf) _mm512_conj_pch (__A),
+				   (__v16sf) __W,
+				   (__mmask16) __U);
+}
+
+extern __inline __m512h
+__attribute__ ((__gnu_inline__, __always_inline__, __artificial__))
+_mm512_maskz_conj_pch (__mmask16 __U, __m512h __A)
+{
+  return (__m512h)
+    __builtin_ia32_movaps512_mask ((__v16sf) _mm512_conj_pch (__A),
+				   (__v16sf) _mm512_setzero_ps (),
+				   (__mmask16) __U);
+}
+
 /* Intrinsics of v[add,sub,mul,div]sh.  */
 extern __inline __m128h
   __attribute__ ((__gnu_inline__, __always_inline__, __artificial__))
diff --git a/gcc/config/i386/avx512fp16vlintrin.h b/gcc/config/i386/avx512fp16vlintrin.h
index 6ce83dfb9e1..36b3fe21d5b 100644
--- a/gcc/config/i386/avx512fp16vlintrin.h
+++ b/gcc/config/i386/avx512fp16vlintrin.h
@@ -151,6 +151,59 @@ _mm256_zextph128_ph256 (__m128h __A)
 					 (__m128) __A, 0);
 }
 
+extern __inline __m256h
+__attribute__ ((__gnu_inline__, __always_inline__, __artificial__))
+_mm256_conj_pch (__m256h __A)
+{
+  return (__m256h) _mm256_xor_epi32 ((__m256i) __A, _mm256_set1_epi32 (1<<31));
+}
+
+extern __inline __m256h
+__attribute__ ((__gnu_inline__, __always_inline__, __artificial__))
+_mm256_mask_conj_pch (__m256h __W, __mmask8 __U, __m256h __A)
+{
+  return (__m256h) __builtin_ia32_movaps256_mask ((__v8sf)
+						   _mm256_conj_pch (__A),
+						  (__v8sf) __W,
+						  (__mmask8) __U);
+}
+
+extern __inline __m256h
+__attribute__ ((__gnu_inline__, __always_inline__, __artificial__))
+_mm256_maskz_conj_pch (__mmask8 __U, __m256h __A)
+{
+  return (__m256h) __builtin_ia32_movaps256_mask ((__v8sf)
+						   _mm256_conj_pch (__A),
+						  (__v8sf)
+						   _mm256_setzero_ps (),
+						  (__mmask8) __U);
+}
+
+extern __inline __m128h
+__attribute__ ((__gnu_inline__, __always_inline__, __artificial__))
+_mm_conj_pch (__m128h __A)
+{
+  return (__m128h) _mm_xor_epi32 ((__m128i) __A, _mm_set1_epi32 (1<<31));
+}
+
+extern __inline __m128h
+__attribute__ ((__gnu_inline__, __always_inline__, __artificial__))
+_mm_mask_conj_pch (__m128h __W, __mmask8 __U, __m128h __A)
+{
+  return (__m128h) __builtin_ia32_movaps128_mask ((__v4sf) _mm_conj_pch (__A),
+						  (__v4sf) __W,
+						  (__mmask8) __U);
+}
+
+extern __inline __m128h
+__attribute__ ((__gnu_inline__, __always_inline__, __artificial__))
+_mm_maskz_conj_pch (__mmask8 __U, __m128h __A)
+{
+  return (__m128h) __builtin_ia32_movaps128_mask ((__v4sf) _mm_conj_pch (__A),
+						  (__v4sf) _mm_setzero_ps (),
+						  (__mmask8) __U);
+}
+
 /* Intrinsics v[add,sub,mul,div]ph.  */
 extern __inline __m128h
 __attribute__ ((__gnu_inline__, __always_inline__, __artificial__))
diff --git a/gcc/testsuite/gcc.target/i386/avx512fp16-conjugation-1.c b/gcc/testsuite/gcc.target/i386/avx512fp16-conjugation-1.c
new file mode 100644
index 00000000000..662b23ca43d
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/avx512fp16-conjugation-1.c
@@ -0,0 +1,34 @@
+/* { dg-do compile} */
+/* { dg-options "-O2 -mavx512fp16" } */
+
+#include <immintrin.h>
+__m512h
+__attribute__ ((noinline, noclone))
+test_mm512_conj_pch (__m512h __A)
+{
+  return _mm512_conj_pch (__A);
+}
+
+/* { dg-final { scan-assembler-times "vpxord\[^\n\]*%zmm\[0-9\]+" 3 } } */
+
+__m512h
+__attribute__ ((noinline, noclone))
+test_mm512_mask_conj_pch (__m512h __W, __mmask16 __U, __m512h __A)
+{
+  return _mm512_mask_conj_pch (__W, __U, __A);
+}
+
+/* { dg-final { scan-assembler-times "vpxord\[^\n\]*%zmm\[0-9\]+" 3 } } */
+/* { dg-final { scan-assembler-times "kmovw\[^\n\]*%k\[1-9\]+" 2 } } */
+/* { dg-final { scan-assembler-times "vmovaps\[^\n]" 2 } } */
+
+__m512h
+__attribute__ ((noinline, noclone))
+test_mm512_maskz_conj_pch (__mmask16 __U, __m512h __A)
+{
+   return _mm512_maskz_conj_pch (__U, __A);
+}
+
+/* { dg-final { scan-assembler-times "vpxord\[^\n\]*%zmm\[0-9\]+" 3 } } */
+/* { dg-final { scan-assembler-times "kmovw\[^\n\]*%k\[1-9\]+" 2 } } */
+/* { dg-final { scan-assembler-times "vmovaps\[ \\t\]+\[^\{\n\]*%zmm\[0-9\]+\{%k\[1-7\]\}\{z\}(?:\n|\[ \\t\]+#)" 1 } } */
diff --git a/gcc/testsuite/gcc.target/i386/avx512fp16vl-conjugation-1.c b/gcc/testsuite/gcc.target/i386/avx512fp16vl-conjugation-1.c
new file mode 100644
index 00000000000..d8fdab7efec
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/avx512fp16vl-conjugation-1.c
@@ -0,0 +1,55 @@
+/* { dg-do compile} */
+/* { dg-options "-O2 -mavx512fp16 -mavx512vl -mavx512dq" } */
+
+#include <immintrin.h>
+__m256h
+__attribute__ ((noinline, noclone))
+test_mm256_conj_pch (__m256h __A)
+{
+  return _mm256_conj_pch (__A);
+}
+
+/* { dg-final { scan-assembler-times "vpxor\[^\n\]*%ymm\[0-9\]+" 3 } } */
+
+__m128h
+__attribute__ ((noinline, noclone))
+test_mm_conj_pch (__m128h __A)
+{
+  return _mm_conj_pch (__A);
+}
+
+/* { dg-final { scan-assembler-times "vpxor\[^\n\]*%xmm\[0-9\]+" 3  } } */
+
+__m256h
+__attribute__ ((noinline, noclone))
+test_mm256_mask_conj_pch (__m256h __W, __mmask8 __U, __m256h __A)
+{
+  return _mm256_mask_conj_pch (__W, __U, __A);
+}
+
+/* { dg-final { scan-assembler-times "vmovaps\[^\n\]*%ymm\[0-9\]+" 2 } } */
+
+__m128h
+__attribute__ ((noinline, noclone))
+test_mm_mask_conj_pch (__m128h __W, __mmask8 __U, __m128h __A)
+{
+  return _mm_mask_conj_pch (__W, __U, __A);
+}
+
+/* { dg-final { scan-assembler-times "vmovaps\[^\n\]*%xmm\[0-9\]+" 2 } } */
+
+__m256h
+__attribute__ ((noinline, noclone))
+test_mm256_maskz_conj_pch (__mmask8 __U, __m256h __A)
+{
+   return _mm256_maskz_conj_pch (__U, __A);
+}
+/* { dg-final { scan-assembler-times "vmovaps\[ \\t\]+\[^\{\n\]*%ymm\[0-9\]+\{%k\[1-7\]\}\{z\}(?:\n|\[ \\t\]+#)" 1 } } */
+
+__m128h
+__attribute__ ((noinline, noclone))
+test_mm_maskz_conj_pch (__mmask8 __U, __m128h __A) {
+   return _mm_maskz_conj_pch (__U, __A);
+}
+
+/* { dg-final { scan-assembler-times "vmovaps\[ \\t\]+\[^\{\n\]*%xmm\[0-9\]+\{%k\[1-7\]\}\{z\}(?:\n|\[ \\t\]+#)" 1 } } */