diff options
| author | H.J. Lu <hjl.tools@gmail.com> | 2020-06-17 06:34:46 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2020-06-22 13:09:33 -0700 |
| commit | ecbbadbf107ea1155ae5b71a8b7bd48f38c76731 (patch) | |
| tree | edc19a18074492532661cf40364d633ac39e75b8 /sysdeps/x86/cpu-tunables.c | |
| parent | ea04f0213135b13d80f568ca2c4127c2ec112537 (diff) | |
| download | glibc-ecbbadbf107ea1155ae5b71a8b7bd48f38c76731.zip glibc-ecbbadbf107ea1155ae5b71a8b7bd48f38c76731.tar.gz glibc-ecbbadbf107ea1155ae5b71a8b7bd48f38c76731.tar.bz2 | |
x86: Update CPU feature detection [BZ #26149]
1. Divide architecture features into the usable features and the preferred
features. The usable features are for correctness and can be exported in
a stable ABI. The preferred features are for performance and only for
glibc internal use.
2. Change struct cpu_features to
struct cpu_features
{
struct cpu_features_basic basic;
unsigned int *usable_p;
struct cpuid_registers cpuid[COMMON_CPUID_INDEX_MAX];
unsigned int usable[USABLE_FEATURE_INDEX_MAX];
unsigned int preferred[PREFERRED_FEATURE_INDEX_MAX];
...
};
and initialize usable_p to pointer to the usable arary so that
struct cpu_features
{
struct cpu_features_basic basic;
unsigned int *usable_p;
struct cpuid_registers cpuid[COMMON_CPUID_INDEX_MAX];
};
can be exported via a stable ABI. The cpuid and usable arrays can be
expanded with backward binary compatibility for both .o and .so files.
3. Add COMMON_CPUID_INDEX_7_ECX_1 for AVX512_BF16.
4. Detect ENQCMD, PKS, AVX512_VP2INTERSECT, MD_CLEAR, SERIALIZE, HYBRID,
TSXLDTRK, L1D_FLUSH, CORE_CAPABILITIES and AVX512_BF16.
5. Rename CAPABILITIES to ARCH_CAPABILITIES.
6. Check if AVX512_VP2INTERSECT, AVX512_BF16 and PKU are usable.
7. Update CPU feature detection test.
Diffstat (limited to 'sysdeps/x86/cpu-tunables.c')
| -rw-r--r-- | sysdeps/x86/cpu-tunables.c | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/sysdeps/x86/cpu-tunables.c b/sysdeps/x86/cpu-tunables.c index 38ad2c2..666ec57 100644 --- a/sysdeps/x86/cpu-tunables.c +++ b/sysdeps/x86/cpu-tunables.c @@ -54,7 +54,7 @@ extern __typeof (memcmp) DEFAULT_MEMCMP; _Static_assert (sizeof (#name) - 1 == len, #name " != " #len); \ if (!DEFAULT_MEMCMP (f, #name, len)) \ { \ - cpu_features->feature[index_arch_##name] \ + cpu_features->feature_##name[index_arch_##name] \ &= ~bit_arch_##name; \ break; \ } @@ -66,10 +66,10 @@ extern __typeof (memcmp) DEFAULT_MEMCMP; if (!DEFAULT_MEMCMP (f, #name, len)) \ { \ if (disable) \ - cpu_features->feature[index_arch_##name] \ + cpu_features->feature_##name[index_arch_##name] \ &= ~bit_arch_##name; \ else \ - cpu_features->feature[index_arch_##name] \ + cpu_features->feature_##name[index_arch_##name] \ |= bit_arch_##name; \ break; \ } @@ -82,10 +82,10 @@ extern __typeof (memcmp) DEFAULT_MEMCMP; if (!DEFAULT_MEMCMP (f, #name, len)) \ { \ if (disable) \ - cpu_features->feature[index_arch_##name] \ + cpu_features->feature_##name[index_arch_##name] \ &= ~bit_arch_##name; \ else if (CPU_FEATURES_ARCH_P (cpu_features, need)) \ - cpu_features->feature[index_arch_##name] \ + cpu_features->feature_##name[index_arch_##name] \ |= bit_arch_##name; \ break; \ } @@ -98,10 +98,10 @@ extern __typeof (memcmp) DEFAULT_MEMCMP; if (!DEFAULT_MEMCMP (f, #name, len)) \ { \ if (disable) \ - cpu_features->feature[index_arch_##name] \ + cpu_features->feature_##name[index_arch_##name] \ &= ~bit_arch_##name; \ else if (CPU_FEATURES_CPU_P (cpu_features, need)) \ - cpu_features->feature[index_arch_##name] \ + cpu_features->feature_##name[index_arch_##name] \ |= bit_arch_##name; \ break; \ } |