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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/107009] [13 Regression] massive unnecessary code blowup in vectorizer Date: Mon, 26 Sep 2022 17:25:25 +0000 [thread overview] Message-ID: <bug-107009-4-Ei5sncQzkV@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-107009-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107009 --- Comment #10 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Aldy Hernandez <aldyh@gcc.gnu.org>: https://gcc.gnu.org/g:5e77d4082fa845f1182641a93cfbae71984244d2 commit r13-2880-g5e77d4082fa845f1182641a93cfbae71984244d2 Author: Aldy Hernandez <aldyh@redhat.com> Date: Fri Sep 23 19:47:19 2022 +0200 Optimize [0 = x & MASK] in range-ops. For [0 = x & MASK], we can determine that x is ~MASK. This is something we're picking up in DOM thanks to maybe_set_nonzero_bits, but is something we should handle natively. This is a good example of how much easier to maintain the range-ops entries are versus the ad-hoc pattern matching stuff we had to do before. For the curious, compare the changes to range-op here, versus maybe_set_nonzero_bits. I'm leaving the call to maybe_set_nonzero_bits until I can properly audit it to make sure we're catching it all in range-ops. It won't hurt, since both set_range_info() and set_nonzero_bits() are intersect operations, so we'll never lose information if we do both. PR tree-optimization/107009 gcc/ChangeLog: * range-op.cc (operator_bitwise_and::op1_range): Optimize 0 = x & MASK. (range_op_bitwise_and_tests): New test.
prev parent reply other threads:[~2022-09-26 17:25 UTC|newest] Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-09-22 18:49 [Bug tree-optimization/107009] New: " drepper.fsp+rhbz at gmail dot com 2022-09-22 19:00 ` [Bug tree-optimization/107009] [13 Regression] " mpolacek at gcc dot gnu.org 2022-09-22 20:03 ` aldyh at gcc dot gnu.org 2022-09-23 6:43 ` rguenth at gcc dot gnu.org 2022-09-23 13:57 ` aldyh at gcc dot gnu.org 2022-09-23 17:56 ` aldyh at gcc dot gnu.org 2022-09-23 17:57 ` aldyh at gcc dot gnu.org 2022-09-23 17:57 ` aldyh at gcc dot gnu.org 2022-09-26 14:42 ` cvs-commit at gcc dot gnu.org 2022-09-26 14:43 ` aldyh at gcc dot gnu.org 2022-09-26 17:25 ` cvs-commit at gcc dot gnu.org [this message]
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