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From: "rguenth at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/42117] VRP should do if-conversion Date: Fri, 20 Nov 2009 13:12:00 -0000 [thread overview] Message-ID: <20091120131234.10680.qmail@sourceware.org> (raw) In-Reply-To: <bug-42117-11173@http.gcc.gnu.org/bugzilla/> ------- Comment #1 from rguenth at gcc dot gnu dot org 2009-11-20 13:12 ------- Confirmed. We do see x_2: [0, 1] EQUIVALENCES: { x_3(D) } (1 elements) y_11: [0, 1] EQUIVALENCES: { y_5(D) } (1 elements) but have no code that actually makes use of this information in <bb 4>: if (x_3(D) != 0) goto <bb 5>; else goto <bb 6>; <bb 5>: if (y_5(D) != 0) goto <bb 7>; else goto <bb 6>; <bb 6>: <bb 7>: # D.2047_1 = PHI <0(6), -1(3), -1(2), 1(5)> return D.2047_1; which we want to if-convert to <bb 4>: tmp = x_3 & y_5; <bb 7>: # D.2047_1 = PHI <tmp(4), -1(3), -1(2)> but there is no code in VRP that does if-conversion. -- rguenth at gcc dot gnu dot org changed: What |Removed |Added ---------------------------------------------------------------------------- Severity|normal |enhancement Status|UNCONFIRMED |NEW Ever Confirmed|0 |1 Last reconfirmed|0000-00-00 00:00:00 |2009-11-20 13:12:34 date| | Summary|VRP fails to get rid of |VRP should do if-conversion |compares | http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42117
next prev parent reply other threads:[~2009-11-20 13:12 UTC|newest] Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top 2009-11-20 12:49 [Bug tree-optimization/42117] New: VRP fails to get rid of compares krebbel at gcc dot gnu dot org 2009-11-20 13:12 ` rguenth at gcc dot gnu dot org [this message] [not found] <bug-42117-4@http.gcc.gnu.org/bugzilla/> 2021-06-06 6:24 ` [Bug tree-optimization/42117] VRP should do if-conversion pinskia at gcc dot gnu.org 2021-07-06 8:01 ` pinskia at gcc dot gnu.org 2023-06-10 2:12 ` pinskia at gcc dot gnu.org
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