diff options
Diffstat (limited to 'sysdeps/x86/cpu-features.c')
| -rw-r--r-- | sysdeps/x86/cpu-features.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/sysdeps/x86/cpu-features.c b/sysdeps/x86/cpu-features.c index 218ff2b..b1915cd 100644 --- a/sysdeps/x86/cpu-features.c +++ b/sysdeps/x86/cpu-features.c @@ -134,6 +134,20 @@ init_cpu_features (struct cpu_features *cpu_features) break; } } + + /* To avoid SSE transition penalty, use _dl_runtime_resolve_slow. + If XGETBV suports ECX == 1, use _dl_runtime_resolve_opt. */ + cpu_features->feature[index_Use_dl_runtime_resolve_slow] + |= bit_Use_dl_runtime_resolve_slow; + if (cpu_features->max_cpuid >= 0xd) + { + unsigned int eax; + + __cpuid_count (0xd, 1, eax, ebx, ecx, edx); + if ((eax & (1 << 2)) != 0) + cpu_features->feature[index_Use_dl_runtime_resolve_opt] + |= bit_Use_dl_runtime_resolve_opt; + } } /* This spells out "AuthenticAMD". */ else if (ebx == 0x68747541 && ecx == 0x444d4163 && edx == 0x69746e65) |