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

[H.J. Lu <hjl@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=96037c697d5a5b1bc19caae74dddf45e041b0ffd

commit 96037c697d5a5b1bc19caae74dddf45e041b0ffd
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Wed Apr 5 09:21:39 2023 -0700

    <sys/platform/x86.h>: Add AVX-IFMA support
    
    Add AVX-IFMA support to <sys/platform/x86.h>.
    Reviewed-by: Noah Goldstein <goldstein.w.n@gmail.com>

Diff:
---
 manual/platform.texi               | 3 +++
 sysdeps/x86/bits/platform/x86.h    | 1 +
 sysdeps/x86/cpu-features.c         | 2 ++
 sysdeps/x86/include/cpu-features.h | 3 +++
 sysdeps/x86/tst-get-cpu-features.c | 2 ++
 5 files changed, 11 insertions(+)

diff --git a/manual/platform.texi b/manual/platform.texi
index 7d4aa3d339..af75e5c413 100644
--- a/manual/platform.texi
+++ b/manual/platform.texi
@@ -219,6 +219,9 @@ Leaf (EAX = 23H).
 @item
 @code{AVX2} -- The AVX2 instruction extensions.
 
+@item
+@code{AVX_IFMA} -- The AVX-IFMA instruction extensions.
+
 @item
 @code{AVX_VNNI} -- The AVX-VNNI instruction extensions.
 
diff --git a/sysdeps/x86/bits/platform/x86.h b/sysdeps/x86/bits/platform/x86.h
index 2776c69b16..abc0116607 100644
--- a/sysdeps/x86/bits/platform/x86.h
+++ b/sysdeps/x86/bits/platform/x86.h
@@ -300,6 +300,7 @@ enum
   x86_cpu_WRMSRNS		= x86_cpu_index_7_ecx_1_eax + 19,
   x86_cpu_AMX_FP16		= x86_cpu_index_7_ecx_1_eax + 21,
   x86_cpu_HRESET		= x86_cpu_index_7_ecx_1_eax + 22,
+  x86_cpu_AVX_IFMA		= x86_cpu_index_7_ecx_1_eax + 23,
   x86_cpu_LAM			= x86_cpu_index_7_ecx_1_eax + 26,
 
   x86_cpu_index_19_ebx
diff --git a/sysdeps/x86/cpu-features.c b/sysdeps/x86/cpu-features.c
index 6c1b5efc5f..06fae443a8 100644
--- a/sysdeps/x86/cpu-features.c
+++ b/sysdeps/x86/cpu-features.c
@@ -139,6 +139,8 @@ update_active (struct cpu_features *cpu_features)
 		  cpu_features->preferred[index_arch_AVX_Fast_Unaligned_Load]
 		    |= bit_arch_AVX_Fast_Unaligned_Load;
 		}
+	      /* Determine if AVX-IFMA is usable.  */
+	      CPU_FEATURE_SET_ACTIVE (cpu_features, AVX_IFMA);
 	      /* Determine if AVX-VNNI is usable.  */
 	      CPU_FEATURE_SET_ACTIVE (cpu_features, AVX_VNNI);
 	      /* Determine if FMA is usable.  */
diff --git a/sysdeps/x86/include/cpu-features.h b/sysdeps/x86/include/cpu-features.h
index 07c841c1d4..1f4b6831f9 100644
--- a/sysdeps/x86/include/cpu-features.h
+++ b/sysdeps/x86/include/cpu-features.h
@@ -311,6 +311,7 @@ enum
 #define bit_cpu_FSRCS		(1u << 12)
 #define bit_cpu_AMX_FP16	(1u << 21)
 #define bit_cpu_HRESET		(1u << 22)
+#define bit_cpu_AVX_IFMA	(1u << 23)
 #define bit_cpu_LAM		(1u << 26)
 
 /* CPUID_INDEX_19.  */
@@ -549,6 +550,7 @@ enum
 #define index_cpu_FSRCS		CPUID_INDEX_7_ECX_1
 #define index_cpu_AMX_FP16	CPUID_INDEX_7_ECX_1
 #define index_cpu_HRESET	CPUID_INDEX_7_ECX_1
+#define index_cpu_AVX_IFMA	CPUID_INDEX_7_ECX_1
 #define index_cpu_LAM		CPUID_INDEX_7_ECX_1
 
 /* CPUID_INDEX_19.  */
@@ -787,6 +789,7 @@ enum
 #define reg_FSRCS		eax
 #define reg_AMX_FP16		eax
 #define reg_HRESET		eax
+#define reg_AVX_IFMA		eax
 #define reg_LAM			eax
 
 /* CPUID_INDEX_19.  */
diff --git a/sysdeps/x86/tst-get-cpu-features.c b/sysdeps/x86/tst-get-cpu-features.c
index c0f222cb77..3a2d4671ec 100644
--- a/sysdeps/x86/tst-get-cpu-features.c
+++ b/sysdeps/x86/tst-get-cpu-features.c
@@ -212,6 +212,7 @@ do_test (void)
   CHECK_CPU_FEATURE_PRESENT (WRMSRNS);
   CHECK_CPU_FEATURE_PRESENT (AMX_FP16);
   CHECK_CPU_FEATURE_PRESENT (HRESET);
+  CHECK_CPU_FEATURE_PRESENT (AVX_IFMA);
   CHECK_CPU_FEATURE_PRESENT (LAM);
   CHECK_CPU_FEATURE_PRESENT (AESKLE);
   CHECK_CPU_FEATURE_PRESENT (WIDE_KL);
@@ -379,6 +380,7 @@ do_test (void)
   CHECK_CPU_FEATURE_ACTIVE (FSRS);
   CHECK_CPU_FEATURE_ACTIVE (FSRCS);
   CHECK_CPU_FEATURE_ACTIVE (AMX_FP16);
+  CHECK_CPU_FEATURE_ACTIVE (AVX_IFMA);
   CHECK_CPU_FEATURE_ACTIVE (AESKLE);
   CHECK_CPU_FEATURE_ACTIVE (WIDE_KL);
   CHECK_CPU_FEATURE_ACTIVE (PTWRITE);