[glibc] <sys/platform/x86.h>: Add AMX-FP16 support

[glibc] <sys/platform/x86.h>: Add AMX-FP16 support

[H.J. Lu]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=8b4cc05eabdb67902171d8c05a4915d14b1e5f58

commit 8b4cc05eabdb67902171d8c05a4915d14b1e5f58
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Wed Apr 5 09:21:38 2023 -0700

    <sys/platform/x86.h>: Add AMX-FP16 support
    
    Add AMX-FP16 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 af79f5eb4d..7d4aa3d339 100644
--- a/manual/platform.texi
+++ b/manual/platform.texi
@@ -200,6 +200,9 @@ The supported processor features are:
 @item
 @code{AMX_INT8} -- Tile computational operations on 8-bit numbers.
 
+@item
+@code{AMX_FP16} -- Tile computational operations on FP16 numbers.
+
 @item
 @code{AMX_TILE} -- Tile architecture.
 
diff --git a/sysdeps/x86/bits/platform/x86.h b/sysdeps/x86/bits/platform/x86.h
index 2a15ad937a..2776c69b16 100644
--- a/sysdeps/x86/bits/platform/x86.h
+++ b/sysdeps/x86/bits/platform/x86.h
@@ -298,6 +298,7 @@ enum
   x86_cpu_FSRS			= x86_cpu_index_7_ecx_1_eax + 11,
   x86_cpu_FSRCS			= x86_cpu_index_7_ecx_1_eax + 12,
   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_LAM			= x86_cpu_index_7_ecx_1_eax + 26,
 
diff --git a/sysdeps/x86/cpu-features.c b/sysdeps/x86/cpu-features.c
index da04ad0b00..6c1b5efc5f 100644
--- a/sysdeps/x86/cpu-features.c
+++ b/sysdeps/x86/cpu-features.c
@@ -213,6 +213,8 @@ update_active (struct cpu_features *cpu_features)
 	  CPU_FEATURE_SET_ACTIVE (cpu_features, AMX_TILE);
 	  /* Determine if AMX_INT8 is usable.  */
 	  CPU_FEATURE_SET_ACTIVE (cpu_features, AMX_INT8);
+	  /* Determine if AMX_FP16 is usable.  */
+	  CPU_FEATURE_SET_ACTIVE (cpu_features, AMX_FP16);
 	}
 
       /* These features are usable only when OSXSAVE is enabled.  */
diff --git a/sysdeps/x86/include/cpu-features.h b/sysdeps/x86/include/cpu-features.h
index 4e40fe0482..07c841c1d4 100644
--- a/sysdeps/x86/include/cpu-features.h
+++ b/sysdeps/x86/include/cpu-features.h
@@ -309,6 +309,7 @@ enum
 #define bit_cpu_FZLRM		(1u << 10)
 #define bit_cpu_FSRS		(1u << 11)
 #define bit_cpu_FSRCS		(1u << 12)
+#define bit_cpu_AMX_FP16	(1u << 21)
 #define bit_cpu_HRESET		(1u << 22)
 #define bit_cpu_LAM		(1u << 26)
 
@@ -546,6 +547,7 @@ enum
 #define index_cpu_FZLRM		CPUID_INDEX_7_ECX_1
 #define index_cpu_FSRS		CPUID_INDEX_7_ECX_1
 #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_LAM		CPUID_INDEX_7_ECX_1
 
@@ -783,6 +785,7 @@ enum
 #define reg_FZLRM		eax
 #define reg_FSRS		eax
 #define reg_FSRCS		eax
+#define reg_AMX_FP16		eax
 #define reg_HRESET		eax
 #define reg_LAM			eax
 
diff --git a/sysdeps/x86/tst-get-cpu-features.c b/sysdeps/x86/tst-get-cpu-features.c
index 9c436eaa64..c0f222cb77 100644
--- a/sysdeps/x86/tst-get-cpu-features.c
+++ b/sysdeps/x86/tst-get-cpu-features.c
@@ -210,6 +210,7 @@ do_test (void)
   CHECK_CPU_FEATURE_PRESENT (FSRS);
   CHECK_CPU_FEATURE_PRESENT (FSRCS);
   CHECK_CPU_FEATURE_PRESENT (WRMSRNS);
+  CHECK_CPU_FEATURE_PRESENT (AMX_FP16);
   CHECK_CPU_FEATURE_PRESENT (HRESET);
   CHECK_CPU_FEATURE_PRESENT (LAM);
   CHECK_CPU_FEATURE_PRESENT (AESKLE);
@@ -377,6 +378,7 @@ do_test (void)
   CHECK_CPU_FEATURE_ACTIVE (FZLRM);
   CHECK_CPU_FEATURE_ACTIVE (FSRS);
   CHECK_CPU_FEATURE_ACTIVE (FSRCS);
+  CHECK_CPU_FEATURE_ACTIVE (AMX_FP16);
   CHECK_CPU_FEATURE_ACTIVE (AESKLE);
   CHECK_CPU_FEATURE_ACTIVE (WIDE_KL);
   CHECK_CPU_FEATURE_ACTIVE (PTWRITE);