[Bug middle-end/35390] New: ~~n != n in some cases

[Bug middle-end/35390] New: ~~n != n in some cases

[takeshi dot mouri dot net at green dot ocn dot ne dot jp]

the preprocessed file:
unsigned
foo (int n)
{
  return ~((unsigned)~n);
}

The above code is compiled to:
;; Function foo (foo)
;; enabled by -tree-original


{
  return (unsigned int) ~n;
}

This should be "return (unsigned int) n".


-- 
           Summary: ~~n != n in some cases
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: takeshi dot mouri dot net at green dot ocn dot ne dot jp
 GCC build triplet: i686-pc-cygwin
  GCC host triplet: i686-pc-cygwin
GCC target triplet: i686-pc-cygwin


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35390

[Bug middle-end/35390] ~~n != n in some cases

[takeshi dot mouri dot net at green dot ocn dot ne dot jp]

------- Comment #1 from takeshi dot mouri dot net at green dot ocn dot ne dot jp  2008-02-27 11:53 -------
The regression is located at revision 129128.


-- 

takeshi dot mouri dot net at green dot ocn dot ne dot jp changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to fail|                            |4.3.0
      Known to work|                            |4.1.1


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35390

[Bug middle-end/35390] [4.3/4.4 Regression] ~~n != n in some cases

[rguenth at gcc dot gnu dot org]

------- Comment #2 from rguenth at gcc dot gnu dot org  2008-02-27 12:32 -------
Confirmed.


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
           Keywords|                            |wrong-code
   Last reconfirmed|0000-00-00 00:00:00         |2008-02-27 12:32:42
               date|                            |
            Summary|~~n != n in some cases      |[4.3/4.4 Regression] ~~n !=
                   |                            |n in some cases
   Target Milestone|---                         |4.3.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35390

[Bug middle-end/35390] [4.3/4.4 Regression] ~~n != n in some cases

[rguenth at gcc dot gnu dot org]

------- Comment #3 from rguenth at gcc dot gnu dot org  2008-02-27 12:32 -------
Mine.


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at gcc dot gnu   |rguenth at gcc dot gnu dot
                   |dot org                     |org
             Status|NEW                         |ASSIGNED
   Last reconfirmed|2008-02-27 12:32:42         |2008-02-27 12:32:52
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35390

[Bug middle-end/35390] [4.3/4.4 Regression] ~~n != n in some cases

[rguenth at gcc dot gnu dot org]

------- Comment #4 from rguenth at gcc dot gnu dot org  2008-02-27 12:36 -------
extern void abort (void);

unsigned int foo (int n)
{
  return ~((unsigned int)~n);
}

int main()
{
  if (foo(0) != 0)
    abort ();
  return 0;
}


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to work|4.1.1                       |4.1.1 4.2.2


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35390

[Bug middle-end/35390] [4.3/4.4 Regression] ~~n != n in some cases

[rguenth at gcc dot gnu dot org]

------- Comment #5 from rguenth at gcc dot gnu dot org  2008-02-27 14:13 -------
Fixed.


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to fail|4.3.0                       |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35390

[Bug middle-end/35390] [4.3/4.4 Regression] ~~n != n in some cases

[rguenth at gcc dot gnu dot org]

------- Comment #6 from rguenth at gcc dot gnu dot org  2008-02-27 14:13 -------
Subject: Bug 35390

Author: rguenth
Date: Wed Feb 27 14:12:33 2008
New Revision: 132712

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=132712
Log:
2008-02-27  Richard Guenther  <rguenther@suse.de>

        PR middle-end/35390
        * fold-const.c (fold_unary): Return the correct argument,
        converted to the result type.

        * gcc.c-torture/execute/pr35390.c: New testcase.

        PR middle-end/34971
        * fold-const.c (fold_binary): Use the types precision, not the
        bitsize of the mode if folding rotate expressions.  Build rotates
        only for full modes.

        * gcc.c-torture/execute/pr34971.c: New testcase.

Added:
    branches/gcc-4_3-branch/gcc/testsuite/gcc.c-torture/execute/pr34971.c
    branches/gcc-4_3-branch/gcc/testsuite/gcc.c-torture/execute/pr35390.c
Modified:
    branches/gcc-4_3-branch/gcc/ChangeLog
    branches/gcc-4_3-branch/gcc/fold-const.c
    branches/gcc-4_3-branch/gcc/testsuite/ChangeLog


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35390

[Bug middle-end/35390] [4.3/4.4 Regression] ~~n != n in some cases

[rguenth at gcc dot gnu dot org]

------- Comment #7 from rguenth at gcc dot gnu dot org  2008-02-27 14:15 -------
Fi-xed.


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35390