On Tue, Nov 9, 2021 at 4:53 PM Lance Richardson <lance.richard...@broadcom.com> wrote: > > 21.11-rc2 builds are failing on CentOS 8.4, apparently because > the intrinsic _mm512_set_epi8() is not defined in the GCC > headers (see example below).
Thanks for reporting Lance. It rings a bell, think it was mentionned in the past. > > Perhaps code using _mm512_set_epi8() could be reworked to > avoid that intrinsic, or maybe support could be detected at build > configuration time and definitions for them could be provided in > DPDK headers. > > Here is a GCC patch to add this intrinsic: > https://www.mail-archive.com/gcc-patches@gcc.gnu.org/msg188664.html > > BTW, GCC 10.2.1 (via "scl enable gcc-toolset-10") is able to build > 21.11-rc2 successfully on CentOS 8.4. > > Lance > > # gcc --version > gcc (GCC) 8.4.1 20200928 (Red Hat 8.4.1-1) > Copyright (C) 2018 Free Software Foundation, Inc. > This is free software; see the source for copying conditions. There is NO > warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. > > In file included from ../lib/hash/rte_thash_gfni.h:16, > from ../lib/hash/rte_thash.h:27, > from ../lib/hash/rte_thash.c:7: > ../lib/hash/rte_thash_x86_gfni.h: In function ‘__rte_thash_gfni’: > ../lib/hash/rte_thash_x86_gfni.h:59:24: error: implicit declaration of > function ‘_mm512_set_epi8’; did you mean ‘_mm512_set1_epi8’? > [-Werror=implicit-function-declaration] > __m512i permute_idx = _mm512_set_epi8(7, 6, 5, 4, 7, 6, 5, 4, > ^~~~~~~~~~~~~~~ > _mm512_set1_epi8 > Vladimir, can you reimplement this part without relying on _mm512_set_epi8? Thanks. -- David Marchand
