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| author | Ulrich Drepper <drepper@redhat.com> | 2009-07-23 13:15:17 -0700 |
|---|---|---|
| committer | Ulrich Drepper <drepper@redhat.com> | 2009-07-23 13:15:17 -0700 |
| commit | d28797e426aa7e4e380a7ae10faf4aa3c4767e0b (patch) | |
| tree | f3219b54a090a6252edd85cd30af80ba81ae556a /sysdeps/x86_64 | |
| parent | 666a9871f7afc40aebcc28eab8890ab99ee01a47 (diff) | |
| download | glibc-d28797e426aa7e4e380a7ae10faf4aa3c4767e0b.zip glibc-d28797e426aa7e4e380a7ae10faf4aa3c4767e0b.tar.gz glibc-d28797e426aa7e4e380a7ae10faf4aa3c4767e0b.tar.bz2 | |
Perform test for Arom x86-64 in central place and handle it.
There will be more than one function which, in multiarch mode, wants
to use SSSE3. We should not test in each of them for Atoms with
slow SSSE3. Instead, disable the SSSE3 bit in the startup code for
such machines.
Diffstat (limited to 'sysdeps/x86_64')
| -rw-r--r-- | sysdeps/x86_64/multiarch/init-arch.c | 8 | ||||
| -rw-r--r-- | sysdeps/x86_64/multiarch/strcpy.S | 13 |
2 files changed, 10 insertions, 11 deletions
diff --git a/sysdeps/x86_64/multiarch/init-arch.c b/sysdeps/x86_64/multiarch/init-arch.c index 29e6873..35fd19a 100644 --- a/sysdeps/x86_64/multiarch/init-arch.c +++ b/sysdeps/x86_64/multiarch/init-arch.c @@ -68,7 +68,13 @@ __init_cpu_features (void) __cpu_features.model += extended_model; } else if (__cpu_features.family == 0x06) - __cpu_features.model += extended_model; + { + __cpu_features.model += extended_model; + + if (__cpu_features.model == 0x1c) + /* Avoid SSSE3 on Atom since it is slow. */ + __cpu_features.cpuid[COMMON_CPUID_INDEX_1].ecx &= ~(1 << 9); + } } /* This spells out "AuthenticAMD". */ else if (ebx == 0x68747541 && ecx == 0x444d4163 && edx == 0x69746e65) diff --git a/sysdeps/x86_64/multiarch/strcpy.S b/sysdeps/x86_64/multiarch/strcpy.S index 25cd013..7e400a9 100644 --- a/sysdeps/x86_64/multiarch/strcpy.S +++ b/sysdeps/x86_64/multiarch/strcpy.S @@ -64,16 +64,9 @@ ENTRY(STRCPY) call __init_cpu_features 1: leaq STRCPY_SSE2(%rip), %rax testl $(1<<9), __cpu_features+CPUID_OFFSET+COMMON_CPUID_INDEX_1*CPUID_SIZE+CPUID_ECX_OFFSET(%rip) - jz 3f -/* Avoid SSSE3 strcpy on Atom since it is slow. */ - cmpl $1, __cpu_features+KIND_OFFSET(%rip) - jne 2f - cmpl $6, __cpu_features+FAMILY_OFFSET(%rip) - jne 2f - cmpl $28, __cpu_features+MODEL_OFFSET(%rip) - jz 3f -2: leaq STRCPY_SSSE3(%rip), %rax -3: ret + jz 2f + leaq STRCPY_SSSE3(%rip), %rax +2: ret END(STRCPY) .section .text.ssse3,"ax",@progbits |