target/i386: Add support for AMX-FP16 in CPUID enumeration

Latest Intel platform Granite Rapids has introduced a new instruction -
AMX-FP16, which performs dot-products of two FP16 tiles and accumulates
the results into a packed single precision tile. AMX-FP16 adds FP16
capability and allows a FP16 GPU trained model to run faster without
loss of accuracy or added SW overhead.

The bit definition:
CPUID.(EAX=7,ECX=1):EAX[bit 21]

Add CPUID definition for AMX-FP16.

Signed-off-by: Jiaxi Chen <jiaxi.chen@linux.intel.com>
Signed-off-by: Tao Su <tao1.su@linux.intel.com>
Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Message-Id: <20230303065913.1246327-3-tao1.su@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index 67210ffd79b95893ee3528efe026303bb4e5d094..841c407d6d76a0ee2750f11cbed9939a02cfa7de 100644 (file)
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -879,7 +879,7 @@ FeatureWordInfo feature_word_info[FEATURE_WORDS] = {
             NULL, NULL, "fzrm", "fsrs",
             "fsrc", NULL, NULL, NULL,
             NULL, NULL, NULL, NULL,
-            NULL, NULL, NULL, NULL,
+            NULL, "amx-fp16", NULL, NULL,
             NULL, NULL, NULL, NULL,
             NULL, NULL, NULL, NULL,
         },

diff --git a/target/i386/cpu.h b/target/i386/cpu.h
index d5843c15558f60f038e695fbb54b2f3f0927e427..7deb37eca5a8d9e1361f675db1a650a5b8f8393b 100644 (file)
--- a/target/i386/cpu.h
+++ b/target/i386/cpu.h
@@ -915,6 +915,8 @@ uint64_t x86_cpu_get_supported_feature_word(FeatureWord w,
 #define CPUID_7_1_EAX_FSRS              (1U << 11)
 /* Fast Short REP CMPS/SCAS */
 #define CPUID_7_1_EAX_FSRC              (1U << 12)
+/* Support Tile Computational Operations on FP16 Numbers */
+#define CPUID_7_1_EAX_AMX_FP16          (1U << 21)
 
 /* XFD Extend Feature Disabled */
 #define CPUID_D_1_EAX_XFD               (1U << 4)