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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/106131] [10/11/12/13 Regression] -fstrict-aliasing breaks normal program that does not use any pointer or reference Date: Thu, 30 Jun 2022 07:57:34 +0000 [thread overview] Message-ID: <bug-106131-4-cnWxBVjysI@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-106131-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106131 Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |ASSIGNED Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org --- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> --- So the issue seems to be that fre1 transforms <bb 3> : _1 = (long unsigned int) i_13; _2 = _1 * 8; _3 = _18 + _2; _40 = MEM[(const struct Pair &)_18].a; _3->a = _40; _44 = MEM[(const struct Pair &)_18].b; _3->b = _44; if (i_13 == 0) goto <bb 4>; [INV] else goto <bb 5>; [INV] <bb 4> : _5 = (long unsigned int) i_13; _6 = _5 * 8; _7 = _18 + _6; _45 = MEM[(const struct Pair &)_18 + 16].a; _7->a = _45; _46 = MEM[(const struct Pair &)_18 + 16].b; _7->b = _46; <bb 5> : _9 = (long unsigned int) i_13; _10 = _9 * 8; _11 = _18 + _10; x = MEM[(const struct Pair &)_11]; y = MEM[(const struct Pair &)_18 + 8]; _47 = MEM[(const int &)&x + 4]; _48 = MEM[(const int &)&y + 4]; if (_47 < _48) goto <bb 7>; [50.00%] else goto <bb 6>; [50.00%] into ... <bb 5> : x = MEM[(const struct Pair &)_3]; y = MEM[(const struct Pair &)_18 + 8]; _48 = MEM[(const int &)&y + 4]; if (_44 < _48) goto <bb 7>; [50.00%] else goto <bb 6>; [50.00%] CSEing the load _47 = MEM[(const int &)&x + 4]; to _44 crossing the conditional clobber in BB4.
next prev parent reply other threads:[~2022-06-30 7:57 UTC|newest] Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-06-29 2:05 [Bug c++/106131] New: " 18307130172 at fudan dot edu.cn 2022-06-29 2:09 ` [Bug c++/106131] " 18307130172 at fudan dot edu.cn 2022-06-29 2:36 ` pinskia at gcc dot gnu.org 2022-06-29 9:26 ` redi at gcc dot gnu.org 2022-06-29 19:20 ` [Bug c++/106131] [10/11/12/13 Regression] " pinskia at gcc dot gnu.org 2022-06-29 19:21 ` pinskia at gcc dot gnu.org 2022-06-29 19:38 ` mpolacek at gcc dot gnu.org 2022-06-29 19:39 ` [Bug tree-optimization/106131] " mpolacek at gcc dot gnu.org 2022-06-29 19:39 ` mpolacek at gcc dot gnu.org 2022-06-30 0:50 ` 18307130172 at fudan dot edu.cn 2022-06-30 6:47 ` rguenther at suse dot de 2022-06-30 7:57 ` rguenth at gcc dot gnu.org [this message] 2022-06-30 8:31 ` rguenth at gcc dot gnu.org 2022-07-01 6:53 ` cvs-commit at gcc dot gnu.org 2022-07-01 6:54 ` [Bug tree-optimization/106131] [10/11/12 " rguenth at gcc dot gnu.org 2022-07-19 11:38 ` cvs-commit at gcc dot gnu.org 2022-10-11 13:04 ` [Bug tree-optimization/106131] [10/11 " cvs-commit at gcc dot gnu.org 2022-10-14 10:47 ` [Bug tree-optimization/106131] [10 " cvs-commit at gcc dot gnu.org 2022-10-14 10:48 ` rguenth at gcc dot gnu.org
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