[Bug middle-end/35412] New: Correctness with -ftrapv depends on libcall notes

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* [Bug middle-end/35412]  New: Correctness with -ftrapv depends on libcall notes
@ 2008-02-29 23:24 steven at gcc dot gnu dot org
  2008-02-29 23:34 ` [Bug middle-end/35412] " rguenth at gcc dot gnu dot org
                   ` (8 more replies)
  0 siblings, 9 replies; 10+ messages in thread
From: steven at gcc dot gnu dot org @ 2008-02-29 23:24 UTC (permalink / raw)
  To: gcc-bugs

See http://gcc.gnu.org/ml/gcc-patches/2007-10/msg01011.html

``When -ftrapv is in effect, libcalls are "necessary" so that the results of an
operation can be propagated without making the call to the libgcc functions
dead. The attached patch causes a failure in pr30286.c.''

This has to be investigated before libcall notes can be removed from the
compiler.


-- 
           Summary: Correctness with -ftrapv depends on libcall notes
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: steven at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35412


^ permalink raw reply	[flat|nested] 10+ messages in thread

* [Bug middle-end/35412] Correctness with -ftrapv depends on libcall notes
  2008-02-29 23:24 [Bug middle-end/35412] New: Correctness with -ftrapv depends on libcall notes steven at gcc dot gnu dot org
@ 2008-02-29 23:34 ` rguenth at gcc dot gnu dot org
  2008-02-29 23:37 ` steven at gcc dot gnu dot org
                   ` (7 subsequent siblings)
  8 siblings, 0 replies; 10+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2008-02-29 23:34 UTC (permalink / raw)
  To: gcc-bugs



------- Comment #1 from rguenth at gcc dot gnu dot org  2008-02-29 23:33 -------
-ftrapv is seriously broken and nobody wants to fix it;  so the most appealing
solution is to remove support for -ftrapv.  See PR19020, especially the
libcall part is broken as well.


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
   Last reconfirmed|0000-00-00 00:00:00         |2008-02-29 23:33:53
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35412


^ permalink raw reply	[flat|nested] 10+ messages in thread

* [Bug middle-end/35412] Correctness with -ftrapv depends on libcall notes
  2008-02-29 23:24 [Bug middle-end/35412] New: Correctness with -ftrapv depends on libcall notes steven at gcc dot gnu dot org
  2008-02-29 23:34 ` [Bug middle-end/35412] " rguenth at gcc dot gnu dot org
@ 2008-02-29 23:37 ` steven at gcc dot gnu dot org
  2008-05-31  9:19 ` [Bug middle-end/35412] [4.4 Regression] Correctness with -ftrapv depended " bonzini at gnu dot org
                   ` (6 subsequent siblings)
  8 siblings, 0 replies; 10+ messages in thread
From: steven at gcc dot gnu dot org @ 2008-02-29 23:37 UTC (permalink / raw)
  To: gcc-bugs



------- Comment #2 from steven at gcc dot gnu dot org  2008-02-29 23:36 -------
PR19020 shows that -ftrapv vs. libcalls is broken even without Paolo's patch.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35412


^ permalink raw reply	[flat|nested] 10+ messages in thread

* [Bug middle-end/35412] [4.4 Regression] Correctness with -ftrapv depended on libcall notes
  2008-02-29 23:24 [Bug middle-end/35412] New: Correctness with -ftrapv depends on libcall notes steven at gcc dot gnu dot org
  2008-02-29 23:34 ` [Bug middle-end/35412] " rguenth at gcc dot gnu dot org
  2008-02-29 23:37 ` steven at gcc dot gnu dot org
@ 2008-05-31  9:19 ` bonzini at gnu dot org
  2008-06-11 11:10 ` jsm28 at gcc dot gnu dot org
                   ` (5 subsequent siblings)
  8 siblings, 0 replies; 10+ messages in thread
From: bonzini at gnu dot org @ 2008-05-31  9:19 UTC (permalink / raw)
  To: gcc-bugs



------- Comment #3 from bonzini at gnu dot org  2008-05-31 09:18 -------
Well, regression is a big word because -ftrapv is broken in general.  I guess
the RM will lower the priority.


-- 

bonzini at gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |SUSPENDED
      Known to fail|                            |4.4.0
      Known to work|                            |4.3.1
            Summary|Correctness with -ftrapv    |[4.4 Regression] Correctness
                   |depends on libcall notes    |with -ftrapv depended on
                   |                            |libcall notes


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35412


^ permalink raw reply	[flat|nested] 10+ messages in thread

* [Bug middle-end/35412] [4.4 Regression] Correctness with -ftrapv depended on libcall notes
  2008-02-29 23:24 [Bug middle-end/35412] New: Correctness with -ftrapv depends on libcall notes steven at gcc dot gnu dot org
                   ` (2 preceding siblings ...)
  2008-05-31  9:19 ` [Bug middle-end/35412] [4.4 Regression] Correctness with -ftrapv depended " bonzini at gnu dot org
@ 2008-06-11 11:10 ` jsm28 at gcc dot gnu dot org
  2008-06-25 11:55 ` [Bug middle-end/35412] " rguenth at gcc dot gnu dot org
                   ` (4 subsequent siblings)
  8 siblings, 0 replies; 10+ messages in thread
From: jsm28 at gcc dot gnu dot org @ 2008-06-11 11:10 UTC (permalink / raw)
  To: gcc-bugs



-- 

jsm28 at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |4.4.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35412


^ permalink raw reply	[flat|nested] 10+ messages in thread

* [Bug middle-end/35412] Correctness with -ftrapv depended on libcall notes
  2008-02-29 23:24 [Bug middle-end/35412] New: Correctness with -ftrapv depends on libcall notes steven at gcc dot gnu dot org
                   ` (3 preceding siblings ...)
  2008-06-11 11:10 ` jsm28 at gcc dot gnu dot org
@ 2008-06-25 11:55 ` rguenth at gcc dot gnu dot org
  2008-07-04 19:43 ` jsm28 at gcc dot gnu dot org
                   ` (3 subsequent siblings)
  8 siblings, 0 replies; 10+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2008-06-25 11:55 UTC (permalink / raw)
  To: gcc-bugs



------- Comment #4 from rguenth at gcc dot gnu dot org  2008-06-25 11:54 -------
Not a regression.  $Summary was true always.


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[4.4 Regression] Correctness|Correctness with -ftrapv
                   |with -ftrapv depended on    |depended on libcall notes
                   |libcall notes               |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35412


^ permalink raw reply	[flat|nested] 10+ messages in thread

* [Bug middle-end/35412] Correctness with -ftrapv depended on libcall notes
  2008-02-29 23:24 [Bug middle-end/35412] New: Correctness with -ftrapv depends on libcall notes steven at gcc dot gnu dot org
                   ` (4 preceding siblings ...)
  2008-06-25 11:55 ` [Bug middle-end/35412] " rguenth at gcc dot gnu dot org
@ 2008-07-04 19:43 ` jsm28 at gcc dot gnu dot org
  2009-04-14 20:00 ` pinskia at gcc dot gnu dot org
                   ` (2 subsequent siblings)
  8 siblings, 0 replies; 10+ messages in thread
From: jsm28 at gcc dot gnu dot org @ 2008-07-04 19:43 UTC (permalink / raw)
  To: gcc-bugs



------- Comment #5 from jsm28 at gcc dot gnu dot org  2008-07-04 19:42 -------
Not a regression, removing milestone.


-- 

jsm28 at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.4.0                       |---


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35412


^ permalink raw reply	[flat|nested] 10+ messages in thread

* [Bug middle-end/35412] Correctness with -ftrapv depended on libcall notes
  2008-02-29 23:24 [Bug middle-end/35412] New: Correctness with -ftrapv depends on libcall notes steven at gcc dot gnu dot org
                   ` (5 preceding siblings ...)
  2008-07-04 19:43 ` jsm28 at gcc dot gnu dot org
@ 2009-04-14 20:00 ` pinskia at gcc dot gnu dot org
  2009-04-14 20:08 ` jv244 at cam dot ac dot uk
  2009-05-14 10:55 ` rguenth at gcc dot gnu dot org
  8 siblings, 0 replies; 10+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2009-04-14 20:00 UTC (permalink / raw)
  To: gcc-bugs



------- Comment #6 from pinskia at gcc dot gnu dot org  2009-04-14 19:59 -------
*** Bug 39771 has been marked as a duplicate of this bug. ***


-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jv244 at cam dot ac dot uk


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35412


^ permalink raw reply	[flat|nested] 10+ messages in thread

* [Bug middle-end/35412] Correctness with -ftrapv depended on libcall notes
  2008-02-29 23:24 [Bug middle-end/35412] New: Correctness with -ftrapv depends on libcall notes steven at gcc dot gnu dot org
                   ` (6 preceding siblings ...)
  2009-04-14 20:00 ` pinskia at gcc dot gnu dot org
@ 2009-04-14 20:08 ` jv244 at cam dot ac dot uk
  2009-05-14 10:55 ` rguenth at gcc dot gnu dot org
  8 siblings, 0 replies; 10+ messages in thread
From: jv244 at cam dot ac dot uk @ 2009-04-14 20:08 UTC (permalink / raw)
  To: gcc-bugs



------- Comment #7 from jv244 at cam dot ac dot uk  2009-04-14 20:08 -------
I'm reopening this report. -ftrapv is still documented, so can be expected to
work by users. 

For the particular problem I have right now, a functional version of this
option would be a great thing to have.


-- 

jv244 at cam dot ac dot uk changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|SUSPENDED                   |NEW
   Last reconfirmed|2008-02-29 23:33:53         |2009-04-14 20:08:33
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35412


^ permalink raw reply	[flat|nested] 10+ messages in thread

* [Bug middle-end/35412] Correctness with -ftrapv depended on libcall notes
  2008-02-29 23:24 [Bug middle-end/35412] New: Correctness with -ftrapv depends on libcall notes steven at gcc dot gnu dot org
                   ` (7 preceding siblings ...)
  2009-04-14 20:08 ` jv244 at cam dot ac dot uk
@ 2009-05-14 10:55 ` rguenth at gcc dot gnu dot org
  8 siblings, 0 replies; 10+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2009-05-14 10:55 UTC (permalink / raw)
  To: gcc-bugs



------- Comment #8 from rguenth at gcc dot gnu dot org  2009-05-14 10:55 -------
*** Bug 40143 has been marked as a duplicate of this bug. ***


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |dickinsm at gmail dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35412


^ permalink raw reply	[flat|nested] 10+ messages in thread

end of thread, other threads:[~2009-05-14 10:55 UTC | newest]

Thread overview: 10+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2008-02-29 23:24 [Bug middle-end/35412] New: Correctness with -ftrapv depends on libcall notes steven at gcc dot gnu dot org
2008-02-29 23:34 ` [Bug middle-end/35412] " rguenth at gcc dot gnu dot org
2008-02-29 23:37 ` steven at gcc dot gnu dot org
2008-05-31  9:19 ` [Bug middle-end/35412] [4.4 Regression] Correctness with -ftrapv depended " bonzini at gnu dot org
2008-06-11 11:10 ` jsm28 at gcc dot gnu dot org
2008-06-25 11:55 ` [Bug middle-end/35412] " rguenth at gcc dot gnu dot org
2008-07-04 19:43 ` jsm28 at gcc dot gnu dot org
2009-04-14 20:00 ` pinskia at gcc dot gnu dot org
2009-04-14 20:08 ` jv244 at cam dot ac dot uk
2009-05-14 10:55 ` rguenth at gcc dot gnu dot org

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