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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/103723] zero extend not moved out of the loop after IV-OPTS Date: Wed, 15 Dec 2021 11:45:28 +0000 [thread overview] Message-ID: <bug-103723-4-kJ5PVROv9R@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-103723-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103723 --- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Actually this is more complex, I had missed the original add too. the full loop: <bb 3> [local count: 958878296]: _18 = (unsigned int) ivtmp.7_15; len_test_12 = _18 + 1; ivtmp.7_7 = ivtmp.7_15 + 1; if (ivtmp.7_7 != _21) goto <bb 7>; [94.50%] else goto <bb 9>; [5.50%] <bb 9> [local count: 52738306]: # len_test_17 = PHI <len_test_12(3)> goto <bb 5>; [100.00%] <bb 7> [local count: 906139990]: <bb 4> [local count: 1014686026]: # ivtmp.7_15 = PHI <ivtmp.7_7(7), 2(6)> _4 = (unsigned int) ivtmp.7_15; len_test_13 = _4; _3 = MEM[(const uint8_t *)buf_9(D) + ivtmp.7_15 * 1]; _6 = MEM[(const uint8_t *)buf_back_11(D) + ivtmp.7_15 * 1]; if (_3 == _6) goto <bb 3>; [94.50%] else goto <bb 10>; [5.50%] <bb 10> [local count: 55807731]: # len_test_16 = PHI <len_test_13(4)> We can't just sink the cast though as that would violate the closed-loop-SSA. We would need to sink also: _18 = (unsigned int) ivtmp.7_15; len_test_12 = _18 + 1; Which we do at the RTL level ....
next prev parent reply other threads:[~2021-12-15 11:45 UTC|newest] Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-12-15 2:54 [Bug tree-optimization/103723] New: Loop invariant motion pass failed to remove unused code from loop lingling.kong7 at gmail dot com 2021-12-15 11:39 ` [Bug tree-optimization/103723] zero extend not moved out of the loop after IV-OPTS pinskia at gcc dot gnu.org 2021-12-15 11:45 ` pinskia at gcc dot gnu.org [this message] 2022-01-04 11:24 ` [Bug tree-optimization/103723] zero extend not sunk out of the loop after IV-OPTS in the sink pass rguenth at gcc dot gnu.org
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