chacha20: SSE2 autodetection support #270
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i586 targets do not have SSE2 enabled by default. This commit adds autodetection for SSE2 in addition to the existing autodetection for AVX2, and falls back to a portable implementation if SSE2 is not available.
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i586 targets do not have SSE2 enabled by default.
This commit adds autodetection for SSE2 in addition to the existing autodetection for AVX2, and falls back to a portable implementation if SSE2 is not available.
See discussion here: rust-random/rand#931 (comment)