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| author | Liubov Dmitrieva <liubov.dmitrieva@intel.com> | 2013-06-28 15:28:50 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2013-06-28 15:31:40 -0700 |
| commit | 6308fd9a46a2f4aa550886e6f58190fb209ef027 (patch) | |
| tree | 668039e1091165b38354a1ffebf35b0058de3eed /sysdeps/x86_64 | |
| parent | 89cd956937f46e8f4a0374994965f991642dd408 (diff) | |
| download | glibc-6308fd9a46a2f4aa550886e6f58190fb209ef027.tar.gz glibc-6308fd9a46a2f4aa550886e6f58190fb209ef027.tar.xz glibc-6308fd9a46a2f4aa550886e6f58190fb209ef027.zip | |
Skip SSE4.2 versions on Intel Silvermont
SSE2/SSSE3 versions are faster than SSE4.2 versions on Intel Silvermont.
Diffstat (limited to 'sysdeps/x86_64')
| -rw-r--r-- | sysdeps/x86_64/multiarch/init-arch.c | 10 | ||||
| -rw-r--r-- | sysdeps/x86_64/multiarch/init-arch.h | 4 | ||||
| -rw-r--r-- | sysdeps/x86_64/multiarch/strchr.S | 2 | ||||
| -rw-r--r-- | sysdeps/x86_64/multiarch/strcmp.S | 34 | ||||
| -rw-r--r-- | sysdeps/x86_64/multiarch/strrchr.S | 2 |
5 files changed, 37 insertions, 15 deletions
diff --git a/sysdeps/x86_64/multiarch/init-arch.c b/sysdeps/x86_64/multiarch/init-arch.c index 9524aeea18..55839610e2 100644 --- a/sysdeps/x86_64/multiarch/init-arch.c +++ b/sysdeps/x86_64/multiarch/init-arch.c @@ -81,8 +81,16 @@ __init_cpu_features (void) case 0x37: /* Unaligned load versions are faster than SSSE3 on Silvermont. */ +#if index_Fast_Unaligned_Load != index_Prefer_PMINUB_for_stringop +# error index_Fast_Unaligned_Load != index_Prefer_PMINUB_for_stringop +#endif +#if index_Fast_Unaligned_Load != index_Slow_SSE4_2 +# error index_Fast_Unaligned_Load != index_Slow_SSE4_2 +#endif __cpu_features.feature[index_Fast_Unaligned_Load] - |= bit_Fast_Unaligned_Load; + |= (bit_Fast_Unaligned_Load + | bit_Prefer_PMINUB_for_stringop + | bit_Slow_SSE4_2); break; default: diff --git a/sysdeps/x86_64/multiarch/init-arch.h b/sysdeps/x86_64/multiarch/init-arch.h index 28edbf7d07..0cb5f5bc30 100644 --- a/sysdeps/x86_64/multiarch/init-arch.h +++ b/sysdeps/x86_64/multiarch/init-arch.h @@ -23,6 +23,7 @@ #define bit_AVX_Usable (1 << 6) #define bit_FMA_Usable (1 << 7) #define bit_FMA4_Usable (1 << 8) +#define bit_Slow_SSE4_2 (1 << 9) /* CPUID Feature flags. */ @@ -62,6 +63,7 @@ # define index_AVX_Usable FEATURE_INDEX_1*FEATURE_SIZE # define index_FMA_Usable FEATURE_INDEX_1*FEATURE_SIZE # define index_FMA4_Usable FEATURE_INDEX_1*FEATURE_SIZE +# define index_Slow_SSE4_2 FEATURE_INDEX_1*FEATURE_SIZE #else /* __ASSEMBLER__ */ @@ -156,9 +158,11 @@ extern const struct cpu_features *__get_cpu_features (void) # define index_Fast_Copy_Backward FEATURE_INDEX_1 # define index_Slow_BSF FEATURE_INDEX_1 # define index_Fast_Unaligned_Load FEATURE_INDEX_1 +# define index_Prefer_PMINUB_for_stringop FEATURE_INDEX_1 # define index_AVX_Usable FEATURE_INDEX_1 # define index_FMA_Usable FEATURE_INDEX_1 # define index_FMA4_Usable FEATURE_INDEX_1 +# define index_Slow_SSE4_2 FEATURE_INDEX_1 # define HAS_ARCH_FEATURE(name) \ ((__get_cpu_features ()->feature[index_##name] & (bit_##name)) != 0) diff --git a/sysdeps/x86_64/multiarch/strchr.S b/sysdeps/x86_64/multiarch/strchr.S index 6860329449..f170238b55 100644 --- a/sysdeps/x86_64/multiarch/strchr.S +++ b/sysdeps/x86_64/multiarch/strchr.S @@ -29,6 +29,8 @@ ENTRY(strchr) jne 1f call __init_cpu_features 1: leaq __strchr_sse2(%rip), %rax + testl $bit_Slow_SSE4_2, __cpu_features+CPUID_OFFSET+index_Slow_SSE4_2(%rip) + jnz 2f testl $bit_SSE4_2, __cpu_features+CPUID_OFFSET+index_SSE4_2(%rip) jz 2f leaq __strchr_sse42(%rip), %rax diff --git a/sysdeps/x86_64/multiarch/strcmp.S b/sysdeps/x86_64/multiarch/strcmp.S index f69aaf42b3..1d4d711838 100644 --- a/sysdeps/x86_64/multiarch/strcmp.S +++ b/sysdeps/x86_64/multiarch/strcmp.S @@ -88,14 +88,16 @@ ENTRY(STRCMP) jne 1f call __init_cpu_features 1: + testl $bit_Slow_SSE4_2, __cpu_features+CPUID_OFFSET+index_Slow_SSE4_2(%rip) + jnz 2f leaq STRCMP_SSE42(%rip), %rax testl $bit_SSE4_2, __cpu_features+CPUID_OFFSET+index_SSE4_2(%rip) - jnz 2f - leaq STRCMP_SSSE3(%rip), %rax + jnz 3f +2: leaq STRCMP_SSSE3(%rip), %rax testl $bit_SSSE3, __cpu_features+CPUID_OFFSET+index_SSSE3(%rip) - jnz 2f + jnz 3f leaq STRCMP_SSE2(%rip), %rax -2: ret +3: ret END(STRCMP) # ifdef USE_AS_STRCASECMP_L @@ -109,16 +111,18 @@ ENTRY(__strcasecmp) # ifdef HAVE_AVX_SUPPORT leaq __strcasecmp_avx(%rip), %rax testl $bit_AVX_Usable, __cpu_features+FEATURE_OFFSET+index_AVX_Usable(%rip) - jnz 2f + jnz 3f # endif + testl $bit_Slow_SSE4_2, __cpu_features+CPUID_OFFSET+index_Slow_SSE4_2(%rip) + jnz 2f leaq __strcasecmp_sse42(%rip), %rax testl $bit_SSE4_2, __cpu_features+CPUID_OFFSET+index_SSE4_2(%rip) - jnz 2f - leaq __strcasecmp_ssse3(%rip), %rax + jnz 3f +2: leaq __strcasecmp_ssse3(%rip), %rax testl $bit_SSSE3, __cpu_features+CPUID_OFFSET+index_SSSE3(%rip) - jnz 2f + jnz 3f leaq __strcasecmp_sse2(%rip), %rax -2: ret +3: ret END(__strcasecmp) weak_alias (__strcasecmp, strcasecmp) # endif @@ -133,16 +137,18 @@ ENTRY(__strncasecmp) # ifdef HAVE_AVX_SUPPORT leaq __strncasecmp_avx(%rip), %rax testl $bit_AVX_Usable, __cpu_features+FEATURE_OFFSET+index_AVX_Usable(%rip) - jnz 2f + jnz 3f # endif + testl $bit_Slow_SSE4_2, __cpu_features+CPUID_OFFSET+index_Slow_SSE4_2(%rip) + jnz 2f leaq __strncasecmp_sse42(%rip), %rax testl $bit_SSE4_2, __cpu_features+CPUID_OFFSET+index_SSE4_2(%rip) - jnz 2f - leaq __strncasecmp_ssse3(%rip), %rax + jnz 3f +2: leaq __strncasecmp_ssse3(%rip), %rax testl $bit_SSSE3, __cpu_features+CPUID_OFFSET+index_SSSE3(%rip) - jnz 2f + jnz 3f leaq __strncasecmp_sse2(%rip), %rax -2: ret +3: ret END(__strncasecmp) weak_alias (__strncasecmp, strncasecmp) # endif diff --git a/sysdeps/x86_64/multiarch/strrchr.S b/sysdeps/x86_64/multiarch/strrchr.S index ee6af6e9dd..3f92a41ef9 100644 --- a/sysdeps/x86_64/multiarch/strrchr.S +++ b/sysdeps/x86_64/multiarch/strrchr.S @@ -32,6 +32,8 @@ ENTRY(strrchr) jne 1f call __init_cpu_features 1: leaq __strrchr_sse2(%rip), %rax + testl $bit_Slow_SSE4_2, __cpu_features+CPUID_OFFSET+index_Slow_SSE4_2(%rip) + jnz 2f testl $bit_SSE4_2, __cpu_features+CPUID_OFFSET+index_SSE4_2(%rip) jz 2f leaq __strrchr_sse42(%rip), %rax |