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| author | Lasse Collin <lasse.collin@tukaani.org> | 2022-10-31 16:26:05 +0200 |
|---|---|---|
| committer | Lasse Collin <lasse.collin@tukaani.org> | 2022-10-31 16:26:05 +0200 |
| commit | cf118c014683069b5dbe91898acdc40f2f0a1f5d (patch) | |
| tree | cd92f13d86354f6ff9a95522bb3a0f5af1574ce6 /configure.ac | |
| parent | Build: Remove obsolete commented-out lines from configure.ac. (diff) | |
| download | xz-cf118c014683069b5dbe91898acdc40f2f0a1f5d.tar.xz | |
Build: Clarify comment in configure.ac about SSE2.
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/configure.ac b/configure.ac index 11b25cd6..20da4a82 100644 --- a/configure.ac +++ b/configure.ac @@ -820,7 +820,10 @@ 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.])], |