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* [Bug middle-end/23989] New: DCE removes a loop when it shouldn't
@ 2005-09-21  7:48 dorit at il dot ibm dot com
  2005-09-21 11:30 ` [Bug tree-optimization/23989] [4.1 Regression] " pinskia at gcc dot gnu dot org
                   ` (6 more replies)
  0 siblings, 7 replies; 10+ messages in thread
From: dorit at il dot ibm dot com @ 2005-09-21  7:48 UTC (permalink / raw)
  To: gcc-bugs

DCE (.t44.dce3) eliminates the third loop in the testcase below, although the 
print loop should be enough to keep it alive:

======================
subroutine foo(a,b)
real a,b
type bzz
   real d(100)
end type bzz
type (bzz) e

dimension a(100), b(100)
read *,x,y
a=log(x)    <--- loop 1
b=log(y)    <--- loop 2
e%d = a+b   <--- loop 3. eliminated
print *,e%d
end
======================

See related thread here: http://gcc.gnu.org/ml/gcc/2005-09/msg00645.html

-- 
           Summary: DCE removes a loop when it shouldn't
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: middle-end
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: dorit at il dot ibm dot com
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: ppc64-yellowdog-linux
  GCC host triplet: ppc64-yellowdog-linux
GCC target triplet: ppc64-yellowdog-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23989


^ permalink raw reply	[flat|nested] 10+ messages in thread
* [Bug tree-optimization/23989] [4.1 Regression] DCE removes a loop when it shouldn't
  2005-09-21  7:48 [Bug middle-end/23989] New: DCE removes a loop when it shouldn't dorit at il dot ibm dot com
@ 2005-09-21 11:30 ` pinskia at gcc dot gnu dot org
  2005-09-21 13:16 ` dorit at il dot ibm dot com
                   ` (5 subsequent siblings)
  6 siblings, 0 replies; 10+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-09-21 11:30 UTC (permalink / raw)
  To: gcc-bugs


------- Additional Comments From pinskia at gcc dot gnu dot org  2005-09-21 11:30 -------
This should be fixed by:
http://gcc.gnu.org/ml/gcc-patches/2005-09/msg01294.html

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|middle-end                  |tree-optimization
           Keywords|                            |wrong-code
      Known to fail|                            |4.1.0
      Known to work|                            |4.0.0 4.0.1
            Summary|DCE removes a loop when it  |[4.1 Regression] DCE removes
                   |shouldn't                   |a loop when it shouldn't
   Target Milestone|---                         |4.1.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23989


^ permalink raw reply	[flat|nested] 10+ messages in thread
* [Bug tree-optimization/23989] [4.1 Regression] DCE removes a loop when it shouldn't
  2005-09-21  7:48 [Bug middle-end/23989] New: DCE removes a loop when it shouldn't dorit at il dot ibm dot com
  2005-09-21 11:30 ` [Bug tree-optimization/23989] [4.1 Regression] " pinskia at gcc dot gnu dot org
@ 2005-09-21 13:16 ` dorit at il dot ibm dot com
  2005-09-21 13:17 ` pinskia at gcc dot gnu dot org
                   ` (4 subsequent siblings)
  6 siblings, 0 replies; 10+ messages in thread
From: dorit at il dot ibm dot com @ 2005-09-21 13:16 UTC (permalink / raw)
  To: gcc-bugs


------- Additional Comments From dorit at il dot ibm dot com  2005-09-21 13:16 -------
Indeed. This bug can be closed now.



-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23989


^ permalink raw reply	[flat|nested] 10+ messages in thread
* [Bug tree-optimization/23989] [4.1 Regression] DCE removes a loop when it shouldn't
  2005-09-21  7:48 [Bug middle-end/23989] New: DCE removes a loop when it shouldn't dorit at il dot ibm dot com
  2005-09-21 11:30 ` [Bug tree-optimization/23989] [4.1 Regression] " pinskia at gcc dot gnu dot org
  2005-09-21 13:16 ` dorit at il dot ibm dot com
@ 2005-09-21 13:17 ` pinskia at gcc dot gnu dot org
  2005-09-21 13:41 ` dberlin at gcc dot gnu dot org
                   ` (3 subsequent siblings)
  6 siblings, 0 replies; 10+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-09-21 13:17 UTC (permalink / raw)
  To: gcc-bugs


------- Additional Comments From pinskia at gcc dot gnu dot org  2005-09-21 13:17 -------
Fixed.

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


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23989


^ permalink raw reply	[flat|nested] 10+ messages in thread
* [Bug tree-optimization/23989] [4.1 Regression] DCE removes a loop when it shouldn't
  2005-09-21  7:48 [Bug middle-end/23989] New: DCE removes a loop when it shouldn't dorit at il dot ibm dot com
                   ` (2 preceding siblings ...)
  2005-09-21 13:17 ` pinskia at gcc dot gnu dot org
@ 2005-09-21 13:41 ` dberlin at gcc dot gnu dot org
  2005-09-21 13:42 ` dberlin at gcc dot gnu dot org
                   ` (2 subsequent siblings)
  6 siblings, 0 replies; 10+ messages in thread
From: dberlin at gcc dot gnu dot org @ 2005-09-21 13:41 UTC (permalink / raw)
  To: gcc-bugs


------- Additional Comments From dberlin at gcc dot gnu dot org  2005-09-21 13:41 -------
This is wrong.
As I stated on IRC, that only fixes the problem as a side effect.  There is a
real latent bug here.  We should be getting the right result regardless of
whether points-to says it points to e or points to anything.

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


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23989


^ permalink raw reply	[flat|nested] 10+ messages in thread
* [Bug tree-optimization/23989] [4.1 Regression] DCE removes a loop when it shouldn't
  2005-09-21  7:48 [Bug middle-end/23989] New: DCE removes a loop when it shouldn't dorit at il dot ibm dot com
                   ` (3 preceding siblings ...)
  2005-09-21 13:41 ` dberlin at gcc dot gnu dot org
@ 2005-09-21 13:42 ` dberlin at gcc dot gnu dot org
  2005-09-21 14:23 ` pinskia at gcc dot gnu dot org
  2005-09-21 14:24 ` pinskia at gcc dot gnu dot org
  6 siblings, 0 replies; 10+ messages in thread
From: dberlin at gcc dot gnu dot org @ 2005-09-21 13:42 UTC (permalink / raw)
  To: gcc-bugs



-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at gcc dot gnu   |dberlin at gcc dot gnu dot
                   |dot org                     |org
             Status|UNCONFIRMED                 |ASSIGNED
     Ever Confirmed|                            |1
   Last reconfirmed|0000-00-00 00:00:00         |2005-09-21 13:42:34
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23989


^ permalink raw reply	[flat|nested] 10+ messages in thread
* [Bug tree-optimization/23989] [4.1 Regression] DCE removes a loop when it shouldn't
  2005-09-21  7:48 [Bug middle-end/23989] New: DCE removes a loop when it shouldn't dorit at il dot ibm dot com
                   ` (4 preceding siblings ...)
  2005-09-21 13:42 ` dberlin at gcc dot gnu dot org
@ 2005-09-21 14:23 ` pinskia at gcc dot gnu dot org
  2005-09-21 14:24 ` pinskia at gcc dot gnu dot org
  6 siblings, 0 replies; 10+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-09-21 14:23 UTC (permalink / raw)
  To: gcc-bugs


------- Additional Comments From pinskia at gcc dot gnu dot org  2005-09-21 14:23 -------
*** Bug 23997 has been marked as a duplicate of this bug. ***

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23989


^ permalink raw reply	[flat|nested] 10+ messages in thread
* [Bug tree-optimization/23989] [4.1 Regression] DCE removes a loop when it shouldn't
  2005-09-21  7:48 [Bug middle-end/23989] New: DCE removes a loop when it shouldn't dorit at il dot ibm dot com
                   ` (5 preceding siblings ...)
  2005-09-21 14:23 ` pinskia at gcc dot gnu dot org
@ 2005-09-21 14:24 ` pinskia at gcc dot gnu dot org
  6 siblings, 0 replies; 10+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-09-21 14:24 UTC (permalink / raw)
  To: gcc-bugs



-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.1.0                       |---


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23989


^ permalink raw reply	[flat|nested] 10+ messages in thread
* [Bug tree-optimization/23989] [4.1 Regression] DCE removes a loop when it shouldn't
       [not found] <bug-23989-8585@http.gcc.gnu.org/bugzilla/>
  2005-10-04 12:37 ` dberlin at gcc dot gnu dot org
@ 2005-10-04 12:38 ` pinskia at gcc dot gnu dot org
  1 sibling, 0 replies; 10+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-10-04 12:38 UTC (permalink / raw)
  To: gcc-bugs



-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |4.1.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23989


^ permalink raw reply	[flat|nested] 10+ messages in thread
* [Bug tree-optimization/23989] [4.1 Regression] DCE removes a loop when it shouldn't
       [not found] <bug-23989-8585@http.gcc.gnu.org/bugzilla/>
@ 2005-10-04 12:37 ` dberlin at gcc dot gnu dot org
  2005-10-04 12:38 ` pinskia at gcc dot gnu dot org
  1 sibling, 0 replies; 10+ messages in thread
From: dberlin at gcc dot gnu dot org @ 2005-10-04 12:37 UTC (permalink / raw)
  To: gcc-bugs



------- Comment #6 from dberlin at gcc dot gnu dot org  2005-10-04 12:37 -------
Wellllllll, i know why this happens if you change the points-to sets. and we
can't fix it until escape analysis is disentangled from alias analysis.
So i'm going to resolve this as fixed, since the original bug is fixd.


-- 

dberlin at gcc dot gnu dot org changed:

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


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23989


^ permalink raw reply	[flat|nested] 10+ messages in thread
end of thread, other threads:[~2005-10-04 12:38 UTC | newest]

Thread overview: 10+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2005-09-21  7:48 [Bug middle-end/23989] New: DCE removes a loop when it shouldn't dorit at il dot ibm dot com
2005-09-21 11:30 ` [Bug tree-optimization/23989] [4.1 Regression] " pinskia at gcc dot gnu dot org
2005-09-21 13:16 ` dorit at il dot ibm dot com
2005-09-21 13:17 ` pinskia at gcc dot gnu dot org
2005-09-21 13:41 ` dberlin at gcc dot gnu dot org
2005-09-21 13:42 ` dberlin at gcc dot gnu dot org
2005-09-21 14:23 ` pinskia at gcc dot gnu dot org
2005-09-21 14:24 ` pinskia at gcc dot gnu dot org
     [not found] <bug-23989-8585@http.gcc.gnu.org/bugzilla/>
2005-10-04 12:37 ` dberlin at gcc dot gnu dot org
2005-10-04 12:38 ` pinskia at gcc dot gnu dot org

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