https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96226
--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jakub Jelinek <ja...@gcc.gnu.org>: https://gcc.gnu.org/g:ac2a6962b91128e700ee52db686dcdb2bab93790 commit r11-5747-gac2a6962b91128e700ee52db686dcdb2bab93790 Author: Jakub Jelinek <ja...@redhat.com> Date: Fri Dec 4 18:44:31 2020 +0100 i386: Add combine splitters to allow combining multiple insns into reg1 = const; reg2 = rotate (reg1, reg3 & cst) [PR96226] As mentioned in the PR, we can combine ~(1 << x) into -2 r<< x, but we give up in the ~(1 << (x & 31)) cases, as *<rotate_insn><mode>3_mask* don't allow immediate operand 1 and find_split_point prefers to split (x & 31) instead of the constant. With these combine splitters we help combine decide how to split those insns. 2020-12-04 Jakub Jelinek <ja...@redhat.com> PR target/96226 * config/i386/i386.md (splitter after *<rotate_insn><mode>3_mask, splitter after *<rotate_insn><mode>3_mask_1): New combine splitters. * gcc.target/i386/pr96226.c: New test.
