[Bug tree-optimization/57876] New: wrong code at -O3 on x86_64-linux-gnu in 32-bit mode

[Bug tree-optimization/57876] New: wrong code at -O3 on x86_64-linux-gnu in 32-bit mode

[su at cs dot ucdavis.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57876

            Bug ID: 57876
           Summary: wrong code at -O3 on x86_64-linux-gnu in 32-bit mode
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: su at cs dot ucdavis.edu

The current gcc trunk mis-compiles the following code on x86_64-linux at -O3 in
32-bit mode. This is a regression from 4.8.x. 

$ gcc-trunk -v   
gcc version 4.9.0 20130710 (experimental) [trunk revision 200864] (GCC) 
$
$ gcc-trunk -m32 -O3 small.c
$ a.out
0
$ gcc-trunk -m32 -O2 small.c
$ a.out
1
$ gcc-4.8 -m32 -O3 small.c
$ a.out
1
$ 


----------------------------------------------------


int printf (const char *, ...);

int a, b = 1, c, *d = &c, f, *g, h, j;
static int e;

int
main ()
{
  int i;
  for (i = 0; i < 2; i++)
    {
      long long k = b;
      int l;
      for (f = 0; f < 8; f++)
    {
      int *m = &e;
      j = *d;
      h = a * j - 1;
      *m = (h == 0) < k;
      g = &l;
    }
    }
  printf ("%d\n", e);
  return 0;
}

[Bug rtl-optimization/57876] wrong code at -O3 on x86_64-linux-gnu in 32-bit mode

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57876

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
                 CC|                            |jakub at gcc dot gnu.org
          Component|tree-optimization           |rtl-optimization
         Resolution|---                         |FIXED

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
This was likely introduced with r200723 and got fixed in r200899.

[Bug rtl-optimization/57876] wrong code at -O3 on x86_64-linux-gnu in 32-bit mode

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57876

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Tue Aug 27 09:24:52 2013
New Revision: 202018

URL: http://gcc.gnu.org/viewcvs?rev=202018&root=gcc&view=rev
Log:
    PR rtl-optimization/57860
    PR rtl-optimization/57861
    PR rtl-optimization/57875
    PR rtl-optimization/57876
    PR rtl-optimization/57877
    * gcc.c-torture/execute/pr57860.c: New test.
    * gcc.c-torture/execute/pr57861.c: New test.
    * gcc.c-torture/execute/pr57875.c: New test.
    * gcc.c-torture/execute/pr57876.c: New test.
    * gcc.c-torture/execute/pr57877.c: New test.

Added:
    trunk/gcc/testsuite/gcc.c-torture/execute/pr57860.c
    trunk/gcc/testsuite/gcc.c-torture/execute/pr57861.c
    trunk/gcc/testsuite/gcc.c-torture/execute/pr57875.c
    trunk/gcc/testsuite/gcc.c-torture/execute/pr57876.c
    trunk/gcc/testsuite/gcc.c-torture/execute/pr57877.c
Modified:
    trunk/gcc/testsuite/ChangeLog