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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/103359] [12 Regression] Dead Code Elimination Regression at -O3 (trunk vs 11.2.0) Date: Tue, 23 Nov 2021 10:11:41 +0000 [thread overview] Message-ID: <bug-103359-4-OycNnOG2m7@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-103359-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103359 Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |aldyh at gcc dot gnu.org --- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> --- So the important part is to eliminate the store to 'c' which GCC11 manages to do from EVRP while trunk fails at this task. The IL into EVRP is absoultely identical: <bb 2> : goto <bb 8>; [INV] <bb 8> : # h_10 = PHI <4(2), h_10(3), h_10(4), 1(7)> d.2_8 = d; if (d.2_8 != 0) goto <bb 3>; [INV] <bb 3> : if (h_10 != 0) goto <bb 4>; [INV] <bb 4> : e.0_1 = e; if (e.0_1 != 0) goto <bb 5>; [INV] <bb 5> : a.1_2 = a; _3 = (short int) a.1_2; _14 = a.1_2 & 1; _4 = (short int) _14; _5 = _4 | h_10; _6 = (int) _5; f.4_21 = (unsigned short) _5; _23 = f.4_21 * 3; _24 = (short int) _23; if (_5 == 0) goto <bb 6>; [INV] else goto <bb 7>; [INV] <bb 6> : c = 0;
next prev parent reply other threads:[~2021-11-23 10:11 UTC|newest] Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-11-22 15:34 [Bug tree-optimization/103359] New: " theodort at inf dot ethz.ch 2021-11-22 22:04 ` [Bug tree-optimization/103359] " pinskia at gcc dot gnu.org 2021-11-22 22:23 ` pinskia at gcc dot gnu.org 2021-11-23 7:30 ` rguenth at gcc dot gnu.org 2021-11-23 10:11 ` rguenth at gcc dot gnu.org [this message] 2021-11-23 11:16 ` rguenth at gcc dot gnu.org 2021-11-23 11:36 ` rguenth at gcc dot gnu.org 2021-11-23 11:37 ` rguenth at gcc dot gnu.org 2021-11-23 13:09 ` aldyh at gcc dot gnu.org 2021-11-23 13:13 ` aldyh at gcc dot gnu.org 2021-11-23 16:03 ` amacleod at redhat dot com 2021-11-25 13:44 ` cvs-commit at gcc dot gnu.org 2021-11-25 13:45 ` amacleod at redhat dot com
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