[Bug c++/39115] New: [4.3 Regression] Value of variable is not read again

[Bug c++/39115] New: [4.3 Regression] Value of variable is not read again

[mt at debian dot org]

[The bug has been reported to the Debian BTS before:
http://bugs.debian.org/491137]

On s390, when using -O2, the attached code fails to throw an exception,
apparently because it does not re-evaluate the value of a variable. If the
variable is marked volatile, the code works as expected.

Best,
Michael


-- 
           Summary: [4.3 Regression] Value of variable is not read again
           Product: gcc
           Version: 4.3.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: mt at debian dot org
 GCC build triplet: s390-unknown-linux-gnu
  GCC host triplet: s390-unknown-linux-gnu
GCC target triplet: s390-unknown-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39115

[Bug target/39115] [4.3 Regression] Value of variable is not read again

[mt at debian dot org]

------- Comment #1 from mt at debian dot org  2009-02-05 23:01 -------
Created an attachment (id=17255)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=17255&action=view)
Not fully preprocessed source (includes <string>), compile with -DVOLATILE to
see the correct behaviour


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39115

[Bug target/39115] [4.3 Regression] Value of variable is not read again

[mt at debian dot org]

------- Comment #2 from mt at debian dot org  2009-02-05 23:02 -------
Created an attachment (id=17256)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=17256&action=view)
Fully preprocessed source, compile with -O2 to see wrong behaviour


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39115

[Bug target/39115] [4.3 Regression] Value of variable is not read again

[mt at debian dot org]

------- Comment #3 from mt at debian dot org  2009-02-05 23:04 -------
I should have added that this worked fine on 4.2 and was broken as of 4.3.1 at
least, earlier versions (> 4.2) untested.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39115

[Bug target/39115] [4.3 Regression] Value of variable is not read again

[rguenth at gcc dot gnu dot org]

-- 

rguenth at gcc dot gnu dot org changed:

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


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39115

[Bug target/39115] [4.3 Regression] Value of variable is not read again

[rguenth at gcc dot gnu dot org]

------- Comment #4 from rguenth at gcc dot gnu dot org  2009-03-13 22:58 -------
Does it work with GCC 4.4?


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to work|                            |4.2.4


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39115

[Bug target/39115] [4.3 Regression] Value of variable is not read again

[mt at debian dot org]

------- Comment #5 from mt at debian dot org  2009-03-16 08:27 -------
Indeed, seems to be fixed in 4.4.0 (tested using Debian's gcc-snapshot, g++
(Debian 20090224-1) 4.4.0 20090224 (experimental)). Sorry for not testing using
a fresh build from 4.4 sources, but I hope that is helpful nevertheless.

Best,
Michael


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39115

[Bug target/39115] [4.3 Regression] Value of variable is not read again

[rguenth at gcc dot gnu dot org]

-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to fail|                            |4.3.3
      Known to work|4.2.4                       |4.2.4 4.4.0
           Priority|P3                          |P2


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39115

[Bug target/39115] [4.3 Regression] Value of variable is not read again

[rguenth at gcc dot gnu dot org]

------- Comment #6 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=39115

[Bug target/39115] [4.3 Regression] Value of variable is not read again

[rguenth at gcc dot gnu dot org]

------- Comment #7 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=39115

[Bug target/39115] [4.3 Regression] Value of variable is not read again

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39115

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
      Known to work|                            |
         Resolution|                            |FIXED
   Target Milestone|4.3.6                       |4.4.0

--- Comment #8 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-06-27 11:47:54 UTC ---
Fixed for 4.4.0.