https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80324
--- Comment #1 from Sven Woop <m...@sven-woop.de> --- These intrinsics are supported by latest ICC and Clang. Documentation of these can be found here: https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=reduce&techs=AVX_512 Likely many other reduce intrinsics that show up in the Intrinsics Guide are missing in GCC too.
