[Bug c/45052] New: [4.5 regression] volatile ignored

[Bug c/45052] New: [4.5 regression] volatile ignored

[a dot kaiser at gmx dot net]

"volatile" seems to have no effect. ReadByte should be called 4 times with
results merged in a word, instead it is called once and replicated 4 times.

arm-none-eabi-gcc -S -Os -mcpu=arm926ej-s src.c

-O0, -O2, -O3 are fine, -O1 and -Os are bad.


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           Summary: [4.5 regression] volatile ignored
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: a dot kaiser at gmx dot net
  GCC host triplet: yagarto 01.05.2010
GCC target triplet: arm-none-eabi


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45052

[Bug c/45052] [4.5 regression] volatile ignored

[a dot kaiser at gmx dot net]

------- Comment #1 from a dot kaiser at gmx dot net  2010-07-24 10:52 -------
Created an attachment (id=21297)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=21297&action=view)
Source code


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45052

[Bug c/45052] [4.5 regression] volatile ignored

[a dot kaiser at gmx dot net]

------- Comment #2 from a dot kaiser at gmx dot net  2010-07-24 10:53 -------
Created an attachment (id=21298)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=21298&action=view)
Bad result


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45052

[Bug c/45052] [4.5 regression] volatile ignored

[a dot kaiser at gmx dot net]

------- Comment #3 from a dot kaiser at gmx dot net  2010-07-24 11:44 -------
Also fine: -Os -fno-ipa-pure-const


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45052

[Bug tree-optimization/45052] [4.5/4.6 Regression] volatile ignored

[rguenth at gcc dot gnu dot org]

------- Comment #4 from rguenth at gcc dot gnu dot org  2010-07-24 14:37 -------
Confirmed.  I have a patch.


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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|UNCONFIRMED                 |ASSIGNED
          Component|c                           |tree-optimization
     Ever Confirmed|0                           |1
           Keywords|                            |wrong-code
   Last reconfirmed|0000-00-00 00:00:00         |2010-07-24 14:37:40
               date|                            |
            Summary|[4.5 regression] volatile   |[4.5/4.6 Regression]
                   |ignored                     |volatile ignored
   Target Milestone|---                         |4.5.1


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45052

[Bug tree-optimization/45052] [4.5/4.6 Regression] volatile ignored

[rguenth at gcc dot gnu dot org]

------- Comment #5 from rguenth at gcc dot gnu dot org  2010-07-26 09:27 -------
Subject: Bug 45052

Author: rguenth
Date: Mon Jul 26 09:26:43 2010
New Revision: 162528

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=162528
Log:
2010-07-26  Richard Guenther  <rguenther@suse.de>

        PR tree-optimization/45052
        * ipa-pure-const.c (check_stmt): Check volatileness.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/ipa-pure-const.c


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45052

[Bug tree-optimization/45052] [4.5 Regression] volatile ignored

[rguenth at gcc dot gnu dot org]

------- Comment #6 from rguenth at gcc dot gnu dot org  2010-07-31 09:30 -------
GCC 4.5.1 is being released, adjusting target milestone.


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rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.5.1                       |4.5.2


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45052

[Bug tree-optimization/45052] [4.5 Regression] volatile ignored

[rguenth at gcc dot gnu dot org]

------- Comment #7 from rguenth at gcc dot gnu dot org  2010-07-31 12:12 -------
Fixed.


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rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
      Known to fail|4.5.0                       |4.5.0 4.5.1
      Known to work|4.3.2 4.4.1 4.4.2 4.6.0     |4.3.2 4.4.1 4.4.2 4.5.2
                   |                            |4.6.0
         Resolution|                            |FIXED


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45052

[Bug tree-optimization/45052] [4.5 Regression] volatile ignored

[rguenth at gcc dot gnu dot org]

------- Comment #8 from rguenth at gcc dot gnu dot org  2010-07-31 12:13 -------
Subject: Bug 45052

Author: rguenth
Date: Sat Jul 31 12:12:43 2010
New Revision: 162781

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=162781
Log:
2010-07-31  Richard Guenther  <rguenther@suse.de>

        PR tree-optimization/45052
        * ipa-pure-const.c (check_stmt): Check volatileness.

Modified:
    branches/gcc-4_5-branch/gcc/ChangeLog
    branches/gcc-4_5-branch/gcc/ipa-pure-const.c


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45052