Commits on Mar 5, 2023

1. Added x86 SIMD optimizations to crypto datatypes. …

   - The v128 operations are optimized for SSE2/SSSE3.
   - srtp_octet_string_is_eq is optimized for SSE2. When SSE2 is not
     available, use a pair of 32-bit accumulators to speed up the
     bulk of the operation. We use two accumulators to leverage
     instruction-level parallelism supported by most modern CPUs.
   - In srtp_cleanse, use memset and ensure it is not optimized away
     with a dummy asm statement, which can potentially consume the
     contents of the memory.
   - Endian conversion functions use gcc-style intrinsics, when possible.
   
   The SIMD code uses intrinsics, which are available on all modern compilers.
   For MSVC, config_in_cmake.h is modified to define gcc/clang-style SSE macros
   based on MSVC predefined macros. We enable all SSE versions when it
   indicates that AVX is enabled. SSE2 is always enabled for x86-64 or for x86
   when SSE2 FP math is enabled.

   

   Lastique committed Mar 5, 2023
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