commit ebe454bcca6a5421512ad228595a5391506e990a
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Thu Oct 8 08:24:47 2020 -0700
 
    <sys/platform/x86.h>: Add AVX512_FP16 support
    
    Add AVX512_FP16 support to <sys/platform/x86.h>.
 
diff --git a/manual/platform.texi b/manual/platform.texi
index 0dd12a4353a93bf2..4f5fdff9d9ef16fd 100644
--- a/manual/platform.texi
+++ b/manual/platform.texi
@@ -210,6 +210,9 @@ The supported processor features are:
 @item
 @code{AVX512_BITALG} -- The AVX512_BITALG instruction extensions.
 
+@item
+@code{AVX512_FP16} -- The AVX512_FP16 instruction extensions.
+
 @item
 @code{AVX512_IFMA} -- The AVX512_IFMA instruction extensions.
 
diff --git a/sysdeps/x86/cpu-features.c b/sysdeps/x86/cpu-features.c
index 7f2ff00f2b4b45f2..67f137259fccf4ad 100644
--- a/sysdeps/x86/cpu-features.c
+++ b/sysdeps/x86/cpu-features.c
@@ -175,6 +175,8 @@ update_usable (struct cpu_features *cpu_features)
 					  AVX512_VP2INTERSECT);
 		  /* Determine if AVX512_BF16 is usable.  */
 		  CPU_FEATURE_SET_USABLE (cpu_features, AVX512_BF16);
+		  /* Determine if AVX512_FP16 is usable.  */
+		  CPU_FEATURE_SET_USABLE (cpu_features, AVX512_FP16);
 		}
 	    }
 	}
diff --git a/sysdeps/x86/sys/platform/x86.h b/sysdeps/x86/sys/platform/x86.h
index 2760b81a56e6c7d7..0b18257e20105ea4 100644
--- a/sysdeps/x86/sys/platform/x86.h
+++ b/sysdeps/x86/sys/platform/x86.h
@@ -259,7 +259,7 @@ extern const struct cpu_features *__x86_get_cpu_features (unsigned int)
 #define bit_cpu_IBT		(1u << 20)
 #define bit_cpu_INDEX_7_EDX_21	(1u << 21)
 #define bit_cpu_AMX_BF16	(1u << 22)
-#define bit_cpu_INDEX_7_EDX_23	(1u << 23)
+#define bit_cpu_AVX512_FP16	(1u << 23)
 #define bit_cpu_AMX_TILE	(1u << 24)
 #define bit_cpu_AMX_INT8	(1u << 25)
 #define bit_cpu_IBRS_IBPB	(1u << 26)
@@ -478,7 +478,7 @@ extern const struct cpu_features *__x86_get_cpu_features (unsigned int)
 #define index_cpu_IBT		COMMON_CPUID_INDEX_7
 #define index_cpu_INDEX_7_EDX_21 COMMON_CPUID_INDEX_7
 #define index_cpu_AMX_BF16	COMMON_CPUID_INDEX_7
-#define index_cpu_INDEX_7_EDX_23 COMMON_CPUID_INDEX_7
+#define index_cpu_AVX512_FP16	COMMON_CPUID_INDEX_7
 #define index_cpu_AMX_TILE	COMMON_CPUID_INDEX_7
 #define index_cpu_AMX_INT8	COMMON_CPUID_INDEX_7
 #define index_cpu_IBRS_IBPB	COMMON_CPUID_INDEX_7
@@ -697,7 +697,7 @@ extern const struct cpu_features *__x86_get_cpu_features (unsigned int)
 #define reg_IBT			edx
 #define reg_INDEX_7_EDX_21	edx
 #define reg_AMX_BF16		edx
-#define reg_INDEX_7_EDX_23	edx
+#define reg_AVX512_FP16		edx
 #define reg_AMX_TILE		edx
 #define reg_AMX_INT8		edx
 #define reg_IBRS_IBPB		edx
diff --git a/sysdeps/x86/tst-get-cpu-features.c b/sysdeps/x86/tst-get-cpu-features.c
index 6fa092a8c10486a0..bcdeb243a82c4adc 100644
--- a/sysdeps/x86/tst-get-cpu-features.c
+++ b/sysdeps/x86/tst-get-cpu-features.c
@@ -189,6 +189,7 @@ do_test (void)
   CHECK_CPU_FEATURE (PCONFIG);
   CHECK_CPU_FEATURE (IBT);
   CHECK_CPU_FEATURE (AMX_BF16);
+  CHECK_CPU_FEATURE (AVX512_FP16);
   CHECK_CPU_FEATURE (AMX_TILE);
   CHECK_CPU_FEATURE (AMX_INT8);
   CHECK_CPU_FEATURE (IBRS_IBPB);
@@ -343,6 +344,7 @@ do_test (void)
   CHECK_CPU_FEATURE_USABLE (TSXLDTRK);
   CHECK_CPU_FEATURE_USABLE (PCONFIG);
   CHECK_CPU_FEATURE_USABLE (AMX_BF16);
+  CHECK_CPU_FEATURE_USABLE (AVX512_FP16);
   CHECK_CPU_FEATURE_USABLE (AMX_TILE);
   CHECK_CPU_FEATURE_USABLE (AMX_INT8);
   CHECK_CPU_FEATURE_USABLE (IBRS_IBPB);