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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug middle-end/53676] [4.7/4.8 regression] empty loop is not always removed now Date: Mon, 25 Jun 2012 13:41:00 -0000 [thread overview] Message-ID: <bug-53676-4-jkGYOKaCwY@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-53676-4@http.gcc.gnu.org/bugzilla/> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53676 --- Comment #7 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-06-25 13:39:29 UTC --- In SCEV analysis we'd need to detect the pattern feeding the truncation tem_3 = (int) result_2; tem_4 = tem_3 + 2; result_5 = (signed char) tem_4; in interpret_rhs_expr - otherwise we ask for the evolution of tem_4 which we cannot express properly because tem_3's chrec wraps. So we'd need to handle result_5 = (signed char) ((int) result_2 + 2) as if it were done without the intermediate tem_4.
next prev parent reply other threads:[~2012-06-25 13:41 UTC|newest] Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top 2012-06-14 22:47 [Bug middle-end/53676] New: [4.7/4.8 regression] constant folding regression, shown as slowdown as measured by Adobe's C++Benchmark matt at use dot net 2012-06-14 22:49 ` [Bug middle-end/53676] " matt at use dot net 2012-06-14 23:00 ` matt at use dot net 2012-06-14 23:13 ` [Bug middle-end/53676] [4.7/4.8 regression] empty loop is not always removed now pinskia at gcc dot gnu.org 2012-06-15 0:02 ` hjl.tools at gmail dot com 2012-06-19 13:18 ` rguenth at gcc dot gnu.org 2012-06-25 8:19 ` rguenth at gcc dot gnu.org 2012-06-25 13:41 ` rguenth at gcc dot gnu.org [this message] 2012-06-27 11:33 ` [Bug middle-end/53676] [4.7 " rguenth at gcc dot gnu.org 2012-06-27 11:33 ` [Bug middle-end/53676] [4.7/4.8 " rguenth at gcc dot gnu.org 2012-06-27 11:33 ` [Bug middle-end/53676] [4.7 " rguenth at gcc dot gnu.org 2012-06-27 18:27 ` matt at use dot net 2012-06-28 8:26 ` rguenther at suse dot de 2012-08-21 21:40 ` matt at use dot net 2012-08-22 8:48 ` rguenth at gcc dot gnu.org 2012-08-22 8:56 ` steven at gcc dot gnu.org 2012-08-22 9:18 ` rguenth at gcc dot gnu.org 2012-08-23 18:01 ` matt at use dot net 2012-09-06 15:21 ` rguenth at gcc dot gnu.org 2012-09-20 10:16 ` jakub at gcc dot gnu.org 2013-04-10 8:11 ` rguenth at gcc dot gnu.org 2013-04-11 7:59 ` rguenth at gcc dot gnu.org 2014-05-06 11:58 ` rguenth at gcc dot gnu.org
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