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Build: Clarify comment in configure.ac about SSE2.
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@ -820,7 +820,10 @@ if test "x$enable_external_sha256$sha256_func_found" = xyesno; then
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AC_MSG_ERROR([--enable-external-sha256 was specified but no supported external SHA-256 implementation was found])
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fi
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# Check for SSE2 intrinsics.
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# Check for SSE2 intrinsics. There is no run-time detection for SSE2 so if
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# compiler options enable SSE2 then SSE2 support is required by the binaries.
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# The compile-time check for SSE2 is done with #ifdefs because some compilers
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# (ICC, MSVC) allow SSE2 intrinsics even when SSE2 isn't enabled.
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AC_CHECK_DECL([_mm_movemask_epi8],
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[AC_DEFINE([HAVE__MM_MOVEMASK_EPI8], [1],
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[Define to 1 if _mm_movemask_epi8 is available.])],
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