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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 <jakub@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.
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