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Merge remote-tracking branch 'yawning/feature16535'
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changes/feature16535
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changes/feature16535
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o Minor features (performance)
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- Improve the runtime speed of Ed25519 operations and Curve25519 keypair
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generation when built targeting 32 bit x86 platforms with SSE2
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available. Implements ticket 16535.
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@ -40,3 +40,7 @@ as of 8757bd4cd209cb032853ece0ce413f122eef212c.
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* On non-x86 targets, GCC's Stack Protector dislikes variables that have
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alignment constraints greater than that of other primitive types.
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The `ALIGN` macro is thus no-oped for all non-SSE2 builds.
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* On 32 bit x86 targets that the compiler thinks supports SSE2, always
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enable SSE2 support by force defining ED25519_SSE2 (x86_64 would also
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always support this, but that code path is slower).
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@ -158,6 +158,16 @@ static inline void U64TO8_LE(unsigned char *p, const uint64_t v) {
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#define ALIGN(x)
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#endif
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/* Tor: Force enable SSE2 on 32 bit x86 systems if the compile target
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* architecture supports it. This is not done on x86-64 as the non-SSE2
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* code benchmarks better, at least on Haswell.
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*/
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#if defined(__SSE2__) && !defined(CPU_X86_64)
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/* undef in case it's manually specified... */
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#undef ED25519_SSE2
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#define ED25519_SSE2
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#endif
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#include <stdlib.h>
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#include <string.h>
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