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| author | Michał Górny <mgorny@gentoo.org> | 2017-10-24 08:54:19 +0200 |
|---|---|---|
| committer | Benjamin Peterson <benjamin@python.org> | 2017-10-23 23:54:19 -0700 |
| commit | 1aa00ff383c43335e4a5044274617dbf59bc839e (patch) | |
| tree | 7a9435e859119e00b0159268a8456a2d7a7db6ea /Modules/_blake2 | |
| parent | 3b66ebe7727dba68c2c6ccf0cd85a4c31255b9b4 (diff) | |
| download | cpython-git-1aa00ff383c43335e4a5044274617dbf59bc839e.tar.gz | |
fixes bpo-31834: Use optimized code for BLAKE2 only with SSSE3+ (#4066)
Rework the code choosing BLAKE2 code paths from using the optimized
variant on all x86_64 machines to using it when SSSE3 or better
supported instructions sets are available.
Firstly, this solves the problem of using pure SSE2 code path on x86_64
machines. As reported in the bug, this code is slower than the reference
code on all tested x86_64 machines. Furthermore, on Athlon64 that lacks
SSSE3, it is even 2.5 times slower than the reference code! Checking
for SSSE3 therefore ensures that the optimized implementation will only
be used when it has a chance of performing better.
Secondly, this makes it possible to use SSSE3+ optimizations on 32-bit
x86 systems. This allows for even 2 times speed gain on modern 32-bit
x86 systems (tested in a 32-bit chroot).
Diffstat (limited to 'Modules/_blake2')
| -rw-r--r-- | Modules/_blake2/blake2b_impl.c | 4 | ||||
| -rw-r--r-- | Modules/_blake2/blake2s_impl.c | 4 |
2 files changed, 6 insertions, 2 deletions
diff --git a/Modules/_blake2/blake2b_impl.c b/Modules/_blake2/blake2b_impl.c index b1ae3e9b62..3c2a035f3d 100644 --- a/Modules/_blake2/blake2b_impl.c +++ b/Modules/_blake2/blake2b_impl.c @@ -26,7 +26,9 @@ #include "impl/blake2.h" #include "impl/blake2-impl.h" /* for secure_zero_memory() and store48() */ -#ifdef BLAKE2_USE_SSE +/* pure SSE2 implementation is very slow, so only use the more optimized SSSE3+ + * https://bugs.python.org/issue31834 */ +#if defined(__SSSE3__) || defined(__SSE4_1__) || defined(__AVX__) || defined(__XOP__) #include "impl/blake2b.c" #else #include "impl/blake2b-ref.c" diff --git a/Modules/_blake2/blake2s_impl.c b/Modules/_blake2/blake2s_impl.c index 3615a383db..2c5697299f 100644 --- a/Modules/_blake2/blake2s_impl.c +++ b/Modules/_blake2/blake2s_impl.c @@ -26,7 +26,9 @@ #include "impl/blake2.h" #include "impl/blake2-impl.h" /* for secure_zero_memory() and store48() */ -#ifdef BLAKE2_USE_SSE +/* pure SSE2 implementation is very slow, so only use the more optimized SSSE3+ + * https://bugs.python.org/issue31834 */ +#if defined(__SSSE3__) || defined(__SSE4_1__) || defined(__AVX__) || defined(__XOP__) #include "impl/blake2s.c" #else #include "impl/blake2s-ref.c" |