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Build: Clarify comment in configure.ac about SSE2.

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This commit is contained in:
Lasse Collin 2022-10-31 16:26:05 +02:00
parent f930638797
commit 4ed56d32a9
1 changed files with 4 additions and 1 deletions
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5
configure.ac
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@ -797,7 +797,10 @@ if test "x$enable_external_sha256$sha256_func_found" = xyesno; then
AC_MSG_ERROR([--enable-external-sha256 was specified but no supported external SHA-256 implementation was found])
fi
# Check for SSE2 intrinsics.
# Check for SSE2 intrinsics. There is no run-time detection for SSE2 so if
# compiler options enable SSE2 then SSE2 support is required by the binaries.
# The compile-time check for SSE2 is done with #ifdefs because some compilers
# (ICC, MSVC) allow SSE2 intrinsics even when SSE2 isn't enabled.
AC_CHECK_DECL([_mm_movemask_epi8],
[AC_DEFINE([HAVE__MM_MOVEMASK_EPI8], [1],
[Define to 1 if _mm_movemask_epi8 is available.])],