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From: "pinskia at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/19703] [4.0 Regression] Poor optimisation of loop test, DOM causing unsigned to int and missing combine compares Date: Sun, 30 Jan 2005 05:25:00 -0000 [thread overview] Message-ID: <20050130052548.4100.qmail@sourceware.org> (raw) In-Reply-To: <20050130025905.19703.andrewhutchinson@cox.net> ------- Additional Comments From pinskia at gcc dot gnu dot org 2005-01-30 05:25 ------- Confirmed (sorry about that I was thinking of something different at the time). Here is a better example for normal targets (PPC and x86 too): extern void foo6(int); void testloop6 (void) { int i; i = 100; do { foo6 ( i); i-=10; } while (i != 0); } The tree dump for the loop on x86: <L0>:; foo6 (i); D.1592 = (unsigned int) i + 0fffffff6; i = (int) D.1592; if (D.1592 != 0) goto <L0>; else goto <L1>; Note this is not IV-OPTS messing up but DOM changing the if statement. -- What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Ever Confirmed| |1 GCC target triplet|avr | Last reconfirmed|0000-00-00 00:00:00 |2005-01-30 05:25:46 date| | Summary|Poor optimisation of loop |[4.0 Regression] Poor |test |optimisation of loop test, | |DOM causing unsigned to int | |and missing combine compares Target Milestone|--- |4.0.0 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19703
next prev parent reply other threads:[~2005-01-30 5:25 UTC|newest] Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top 2005-01-30 2:59 [Bug c/19703] New: Poor optimisation of loop test andrewhutchinson at cox dot net 2005-01-30 3:17 ` [Bug tree-optimization/19703] " pinskia at gcc dot gnu dot org 2005-01-30 3:17 ` pinskia at gcc dot gnu dot org 2005-01-30 4:58 ` andrewhutchinson at cox dot net 2005-01-30 5:25 ` pinskia at gcc dot gnu dot org [this message] 2005-01-30 19:20 ` [Bug tree-optimization/19703] [4.0 Regression] Poor optimisation of loop test, DOM causing unsigned to int and missing combine compares pinskia at gcc dot gnu dot org 2005-02-10 23:46 ` pinskia at gcc dot gnu dot org 2005-04-21 5:05 ` [Bug tree-optimization/19703] [4.0/4.1 " mmitchel at gcc dot gnu dot org 2005-06-26 18:03 ` pinskia at gcc dot gnu dot org 2005-07-08 1:43 ` mmitchel at gcc dot gnu dot org 2005-08-17 12:43 ` [Bug tree-optimization/19703] [4.0 " pinskia at gcc dot gnu dot org 2005-09-27 16:12 ` mmitchel at gcc dot gnu dot org [not found] <bug-19703-7648@http.gcc.gnu.org/bugzilla/> 2005-11-04 15:36 ` pinskia at gcc dot gnu dot org
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