https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96938
--- Comment #5 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:5d057bfeff70e5b8d00e521844c476f62d51e22c commit r11-6631-g5d057bfeff70e5b8d00e521844c476f62d51e22c Author: Jakub Jelinek <ja...@redhat.com> Date: Wed Jan 13 10:15:13 2021 +0100 i386: Add define_insn_and_split patterns for btrl [PR96938] In the following testcase we only optimize f2 and f7 to btrl, although we should optimize that way all of the functions. The problem is the type demotion/narrowing (which is performed solely during the generic folding and not later), without it we see the AND performed in SImode and match it as btrl, but with it while the shifts are still performed in SImode, the AND is already done in QImode or HImode low part of the shift. 2021-01-13 Jakub Jelinek <ja...@redhat.com> PR target/96938 * config/i386/i386.md (*btr<mode>_1, *btr<mode>_2): New define_insn_and_split patterns. (splitter after *btr<mode>_2): New splitter. * gcc.target/i386/pr96938.c: New test.
