diff mbox series

[v2,2/6] target/i386: Add support for AMX-FP16 in CPUID enumeration

Message ID 20230303065913.1246327-3-tao1.su@linux.intel.com (mailing list archive)
State New, archived
Headers show
Series target/i386: Support new Intel platform Instructions in CPUID enumeration | expand

Commit Message

Tao Su March 3, 2023, 6:59 a.m. UTC 
From: Jiaxi Chen <jiaxi.chen@linux.intel.com>

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>
---
 target/i386/cpu.c | 2 +-
 target/i386/cpu.h | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index e54e13d050..ed08a52619 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -876,7 +876,7 @@  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 7df8f4b8f9..ae6a0fdfc2 100644
--- a/target/i386/cpu.h
+++ b/target/i386/cpu.h
@@ -912,6 +912,8 @@  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)