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From: "ysrumyan at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/68021] [6 Regression] ice in rewrite_use_nonlinear_expr with -O3
Date: Wed, 21 Oct 2015 09:48:00 -0000	[thread overview]
Message-ID: <bug-68021-4-LcIm5zdPcY@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-68021-4@http.gcc.gnu.org/bugzilla/>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68021

--- Comment #4 from Yuri Rumyantsev <ysrumyan at gmail dot com> ---
Indeed, there is an issue with outer-loop unswitching - it should not be
performed for infinite loops. But if we slightly modify test if finite
outer-loop we will get the same error: 
char a;
void fn1(char *p1, int p2, int p3) {
  int i, x;
  for (i = 0; i < 10; i++) {
    for (x = 0; x < p3; x++) {
      *p1 = a;
      p1--;
    }
    p1 += p2;
  }
}

I assume that  sccp is responsible for it.


  parent reply	other threads:[~2015-10-21  9:48 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-10-19 18:07 [Bug c++/68021] New: " dcb314 at hotmail dot com
2015-10-20  8:09 ` [Bug tree-optimization/68021] [6 Regression] " rguenth at gcc dot gnu.org
2015-10-20  9:09 ` mpolacek at gcc dot gnu.org
2015-10-20 16:05 ` ysrumyan at gmail dot com
2015-10-21  9:48 ` ysrumyan at gmail dot com [this message]
2015-10-21 12:46 ` ysrumyan at gmail dot com

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