https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105354
--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by hongtao Liu <liuho...@gcc.gnu.org>: https://gcc.gnu.org/g:fcda0efccad41eba9134c1bd9d024a93d93fb82f commit r13-210-gfcda0efccad41eba9134c1bd9d024a93d93fb82f Author: liuhongt <hongtao....@intel.com> Date: Wed Apr 27 16:24:44 2022 +0800 Implement permutation with pslldq + psrldq + por when pshufb is not available. pand/pandn may be used to clear upper/lower bits of the operands, in that case there will be 4-5 instructions for permutation, and it's still better than scalar codes. gcc/ChangeLog: PR target/105354 * config/i386/i386-expand.cc (expand_vec_perm_pslldq_psrldq_por): New function. (ix86_expand_vec_perm_const_1): Try expand_vec_perm_pslldq_psrldq_por for both 3-instruction and 4/5-instruction sequence. gcc/testsuite/ChangeLog: * gcc.target/i386/pr105354-1.c: New test. * gcc.target/i386/pr105354-2.c: New test.
