[Bug middle-end/38999] New: [4.2/4.3/4.4 Regression] Extra overflow warning in 32-bit HWI compiler

[Bug middle-end/38999] New: [4.2/4.3/4.4 Regression] Extra overflow warning in 32-bit HWI compiler

[jakub at gcc dot gnu dot org]

+++ This bug was initially created as a clone of Bug #38934 +++

This failure is not "worked around" by FRE unlike 38932.

/* { dg-do compile } */
/* { dg-options "-O2 --std=gnu99" } */

/* This variable needed only to work around earlier optimizations than VRP.  */
unsigned char g;

extern void abort();

void f (long long int p)
{
  g = 255;
  /* { dg-warning "constant is" "" { target *-*-* } 14 } */
  /* { dg-warning "overflow" "" { target *-*-* } 14 } */
  if (p >= -9223372036854775808LL - (signed char) g)
    p = 1;

  if (p)
    abort ();
}

3.2.x issued just one warning both in 32-bit HWI i386 gcc and x86_64 -m32 gcc,
haven't checked 3.3, 3.4 and later issues one extra warning in 32-bit HWI
compilation.


-- 
           Summary: [4.2/4.3/4.4 Regression] Extra overflow warning in 32-
                    bit HWI compiler
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: jakub at gcc dot gnu dot org
GCC target triplet: i686-pc-linux-gnu
 BugsThisDependsOn: 38934


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38999

[Bug middle-end/38999] [4.2/4.3/4.4 Regression] Extra overflow warning in 32-bit HWI compiler

[jakub at gcc dot gnu dot org]

-- 

jakub at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |4.3.4


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38999

[Bug middle-end/38999] [4.2/4.3/4.4 Regression] Extra overflow warning in 32-bit HWI compiler

[bonzini at gnu dot org]

------- Comment #1 from bonzini at gnu dot org  2009-01-28 11:27 -------
Two warnings for 3.3.


-- 

bonzini at gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bonzini at gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38999

[Bug middle-end/38999] [4.2/4.3/4.4 Regression] Extra overflow warning in 32-bit HWI compiler

[rguenth at gcc dot gnu dot org]

-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |diagnostic
           Priority|P3                          |P2
   Target Milestone|4.3.4                       |4.2.5


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38999

[Bug middle-end/38999] [4.2/4.3/4.4 Regression] Extra overflow warning in 32-bit HWI compiler

[steven at gcc dot gnu dot org]

------- Comment #2 from steven at gcc dot gnu dot org  2009-02-21 22:25 -------
Confirmed, then...  I've tested 3.4, 4.1, and 4.3.  I suppose 4.2 is the same.


-- 

steven at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
      Known to fail|                            |3.3 3.4.0 4.0.0 4.1.0 4.2.0
                   |                            |4.3.0 4.4.0
      Known to work|                            |3.2
   Last reconfirmed|0000-00-00 00:00:00         |2009-02-21 22:25:37
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38999

[Bug middle-end/38999] [4.3/4.4/4.5 Regression] Extra overflow warning in 32-bit HWI compiler

[jsm28 at gcc dot gnu dot org]

------- Comment #3 from jsm28 at gcc dot gnu dot org  2009-03-31 21:08 -------
Closing 4.2 branch.


-- 

jsm28 at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[4.2/4.3/4.4/4.5 Regression]|[4.3/4.4/4.5 Regression]
                   |Extra overflow warning in   |Extra overflow warning in
                   |32-bit HWI compiler         |32-bit HWI compiler
   Target Milestone|4.2.5                       |4.3.4


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38999

[Bug middle-end/38999] [4.3/4.4/4.5 Regression] Extra overflow warning in 32-bit HWI compiler

[rguenth at gcc dot gnu dot org]

------- Comment #4 from rguenth at gcc dot gnu dot org  2009-08-04 12:29 -------
GCC 4.3.4 is being released, adjusting target milestone.


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.3.4                       |4.3.5


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38999

[Bug middle-end/38999] [4.3/4.4/4.5/4.6 Regression] Extra overflow warning in 32-bit HWI compiler

[rguenth at gcc dot gnu dot org]

------- Comment #5 from rguenth at gcc dot gnu dot org  2010-05-22 18:13 -------
GCC 4.3.5 is being released, adjusting target milestone.


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.3.5                       |4.3.6


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38999