[glibc] <sys/platform/x86.h>: Add AVX-VNNI support

[glibc] <sys/platform/x86.h>: Add AVX-VNNI support

[H.J. Lu]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=875a50ff63b2c86af770949d563ee851d08eb46e

commit 875a50ff63b2c86af770949d563ee851d08eb46e
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Thu Oct 8 08:33:45 2020 -0700

    <sys/platform/x86.h>: Add AVX-VNNI support
    
    Add AVX-VNNI support to <sys/platform/x86.h>.

Diff:
---
 manual/platform.texi               | 3 +++
 sysdeps/x86/cpu-features.c         | 2 ++
 sysdeps/x86/sys/platform/x86.h     | 3 +++
 sysdeps/x86/tst-get-cpu-features.c | 2 ++
 4 files changed, 10 insertions(+)

diff --git a/manual/platform.texi b/manual/platform.texi
index 4f5fdff9d9..283f255679 100644
--- a/manual/platform.texi
+++ b/manual/platform.texi
@@ -198,6 +198,9 @@ The supported processor features are:
 @item
 @code{AVX2} -- The AVX2 instruction extensions.
 
+@item
+@code{AVX_VNNI} -- The AVX-VNNI instruction extensions.
+
 @item
 @code{AVX512_4FMAPS} -- The AVX512_4FMAPS instruction extensions.
 
diff --git a/sysdeps/x86/cpu-features.c b/sysdeps/x86/cpu-features.c
index 4ecb8cee2c..b0fac22c27 100644
--- a/sysdeps/x86/cpu-features.c
+++ b/sysdeps/x86/cpu-features.c
@@ -119,6 +119,8 @@ update_usable (struct cpu_features *cpu_features)
 		  cpu_features->preferred[index_arch_AVX_Fast_Unaligned_Load]
 		    |= bit_arch_AVX_Fast_Unaligned_Load;
 		}
+	      /* Determine if AVX-VNNI is usable.  */
+	      CPU_FEATURE_SET_USABLE (cpu_features, AVX_VNNI);
 	      /* Determine if FMA is usable.  */
 	      CPU_FEATURE_SET_USABLE (cpu_features, FMA);
 	      /* Determine if VAES is usable.  */
diff --git a/sysdeps/x86/sys/platform/x86.h b/sysdeps/x86/sys/platform/x86.h
index 00cd151199..276de1eb6b 100644
--- a/sysdeps/x86/sys/platform/x86.h
+++ b/sysdeps/x86/sys/platform/x86.h
@@ -311,6 +311,7 @@ extern const struct cpu_features *__x86_get_cpu_features (unsigned int)
 /* COMMON_CPUID_INDEX_7_ECX_1.  */
 
 /* EAX.  */
+#define bit_cpu_AVX_VNNI	(1u << 4)
 #define bit_cpu_AVX512_BF16	(1u << 5)
 
 /* COMMON_CPUID_INDEX_19.  */
@@ -530,6 +531,7 @@ extern const struct cpu_features *__x86_get_cpu_features (unsigned int)
 /* COMMON_CPUID_INDEX_7_ECX_1.  */
 
 /* EAX.  */
+#define index_cpu_AVX_VNNI	COMMON_CPUID_INDEX_7_ECX_1
 #define index_cpu_AVX512_BF16	COMMON_CPUID_INDEX_7_ECX_1
 
 /* COMMON_CPUID_INDEX_19.  */
@@ -749,6 +751,7 @@ extern const struct cpu_features *__x86_get_cpu_features (unsigned int)
 /* COMMON_CPUID_INDEX_7_ECX_1.  */
 
 /* EAX.  */
+#define reg_AVX_VNNI		eax
 #define reg_AVX512_BF16		eax
 
 /* COMMON_CPUID_INDEX_19.  */
diff --git a/sysdeps/x86/tst-get-cpu-features.c b/sysdeps/x86/tst-get-cpu-features.c
index 7262c3a3fa..e87158d45b 100644
--- a/sysdeps/x86/tst-get-cpu-features.c
+++ b/sysdeps/x86/tst-get-cpu-features.c
@@ -221,6 +221,7 @@ do_test (void)
   CHECK_CPU_FEATURE (XFD);
   CHECK_CPU_FEATURE (INVARIANT_TSC);
   CHECK_CPU_FEATURE (WBNOINVD);
+  CHECK_CPU_FEATURE (AVX_VNNI);
   CHECK_CPU_FEATURE (AVX512_BF16);
   CHECK_CPU_FEATURE (AESKLE);
   CHECK_CPU_FEATURE (WIDE_KL);
@@ -376,6 +377,7 @@ do_test (void)
   CHECK_CPU_FEATURE_USABLE (XFD);
   CHECK_CPU_FEATURE_USABLE (INVARIANT_TSC);
   CHECK_CPU_FEATURE_USABLE (WBNOINVD);
+  CHECK_CPU_FEATURE_USABLE (AVX_VNNI);
   CHECK_CPU_FEATURE_USABLE (AVX512_BF16);
   CHECK_CPU_FEATURE_USABLE (AESKLE);
   CHECK_CPU_FEATURE_USABLE (WIDE_KL);