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x86/cpu: Add AVX512_FP16 cpu feature 

AVX512 Half-precision floating point (FP16) has better performance
compared to FP32 if the presicion or magnitude requirements are met.
It's defined as CPUID.(EAX=7,ECX=0):EDX[bit 23].

Refer to
https://software.intel.com/content/www/us/en/develop/download/\
intel-architecture-instruction-set-extensions-programming-reference.html

Signed-off-by: Cathy Zhang <cathy.zhang@intel.com>
Message-Id: <20201216224002.32677-1-cathy.zhang@intel.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
This commit is contained in:
Cathy Zhang 2020-12-17 06:40:02 +08:00 committed by Eduardo Habkost
parent 23eb5d032f
commit 40399ecb69
2 changed files with 3 additions and 1 deletions
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2
target/i386/cpu.c
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@ -979,7 +979,7 @@ static FeatureWordInfo feature_word_info[FEATURE_WORDS] = {
"avx512-vp2intersect", NULL, "md-clear", NULL,
NULL, NULL, "serialize", NULL,
"tsx-ldtrk", NULL, NULL /* pconfig */, NULL,
NULL, NULL, NULL, NULL,
NULL, NULL, NULL, "avx512-fp16",
NULL, NULL, "spec-ctrl", "stibp",
NULL, "arch-capabilities", "core-capability", "ssbd",
},

2
target/i386/cpu.h
View File

@ -784,6 +784,8 @@ typedef uint64_t FeatureWordArray[FEATURE_WORDS];
#define CPUID_7_0_EDX_SERIALIZE (1U << 14)
/* TSX Suspend Load Address Tracking instruction */
#define CPUID_7_0_EDX_TSX_LDTRK (1U << 16)
/* AVX512_FP16 instruction */
#define CPUID_7_0_EDX_AVX512_FP16 (1U << 23)
/* Speculation Control */
#define CPUID_7_0_EDX_SPEC_CTRL (1U << 26)
/* Single Thread Indirect Branch Predictors */