[PATCH v2 1/6] target/i386: Add support for CMPCCXADD in CPUID enumeration

[Tao Su <tao1.su@linux.intel.com>]

From: Jiaxi Chen <jiaxi.chen@linux.intel.com>

CMPccXADD is a new set of instructions in the latest Intel platform
Sierra Forest. This new instruction set includes a semaphore operation
that can compare and add the operands if condition is met, which can
improve database performance.

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

Add CPUID definition for CMPCCXADD.

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 --git a/target/i386/cpu.c b/target/i386/cpu.c
index 4bad3d41d3..e54e13d050 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -872,7 +872,7 @@ FeatureWordInfo feature_word_info[FEATURE_WORDS] = {
         .type = CPUID_FEATURE_WORD,
         .feat_names = {
             NULL, NULL, NULL, NULL,
-            "avx-vnni", "avx512-bf16", NULL, NULL,
+            "avx-vnni", "avx512-bf16", NULL, "cmpccxadd",
             NULL, NULL, "fzrm", "fsrs",
             "fsrc", NULL, NULL, NULL,
             NULL, NULL, NULL, NULL,
diff --git a/target/i386/cpu.h b/target/i386/cpu.h
index ea650e68a3..7df8f4b8f9 100644
--- a/target/i386/cpu.h
+++ b/target/i386/cpu.h
@@ -904,6 +904,8 @@ uint64_t x86_cpu_get_supported_feature_word(FeatureWord w,
 #define CPUID_7_1_EAX_AVX_VNNI          (1U << 4)
 /* AVX512 BFloat16 Instruction */
 #define CPUID_7_1_EAX_AVX512_BF16       (1U << 5)
+/* CMPCCXADD Instructions */
+#define CPUID_7_1_EAX_CMPCCXADD         (1U << 7)
 /* Fast Zero REP MOVS */
 #define CPUID_7_1_EAX_FZRM              (1U << 10)
 /* Fast Short REP STOS */
-- 
2.34.1