[Bug tree-optimization/42642] New: "-fcompare-debug failure" with "-O1 -fpeel-loops"

[Bug tree-optimization/42642] New: "-fcompare-debug failure" with "-O1 -fpeel-loops"

[zsojka at seznam dot cz]

Command line:
g++ -O1 -fpeel-loops -fcompare-debug -c testcase.cpp
it has to be compiled as C++ code, even though it's valid C code

Tested revisions (x86_64):
r155680 - crash
r155662 - crash (x86)
r154886 - crash
r154830 - crash
r153685 - OK (built without graphite support, if that matters)

Output:
$ /mnt/svn/gcc-trunk/binary-155680-lto/bin/g++ -O1 -fcompare-debug -fpeel-loops
testcase.cpp -c
g++: testcase.cpp: -fcompare-debug failure

Valgrind:
no errors reported


-- 
           Summary: "-fcompare-debug failure" with "-O1 -fpeel-loops"
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: zsojka at seznam dot cz
  GCC host triplet: x86(_64)-pc-linux-gnu
GCC target triplet: x86(_64)-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42642

[Bug tree-optimization/42642] "-fcompare-debug failure" with "-O1 -fpeel-loops"

[zsojka at seznam dot cz]

------- Comment #1 from zsojka at seznam dot cz  2010-01-07 00:39 -------
Created an attachment (id=19494)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=19494&action=view)
reduced testcase

Command line:
g++ -O1 -fpeel-loops -fcompare-debug pr42642.cpp -c


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42642

[Bug tree-optimization/42642] "-fcompare-debug failure" with "-O1 -fpeel-loops"

[steven at gcc dot gnu dot org]

------- Comment #2 from steven at gcc dot gnu dot org  2010-01-07 07:17 -------
Can you try with -fnoweb?


-- 

steven at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at gcc dot gnu   |steven at gcc dot gnu dot
                   |dot org                     |org
             Status|UNCONFIRMED                 |ASSIGNED
     Ever Confirmed|0                           |1
   Last reconfirmed|0000-00-00 00:00:00         |2010-01-07 07:17:23
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42642

[Bug tree-optimization/42642] "-fcompare-debug failure" with "-O1 -fpeel-loops"

[zsojka at seznam dot cz]

------- Comment #3 from zsojka at seznam dot cz  2010-01-07 12:50 -------
-fno-web helps even with original testcase (and higher optimization level)


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42642

[Bug tree-optimization/42642] "-fcompare-debug failure" with "-O1 -fpeel-loops"

[steven at gcc dot gnu dot org]

------- Comment #4 from steven at gcc dot gnu dot org  2010-01-18 16:57 -------
I think this is fixed now, with Alexandre's patch. Could the OP confirm that
please?

On to the next -fcompare-debug failure :-)


-- 

steven at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |WAITING


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42642

[Bug tree-optimization/42642] "-fcompare-debug failure" with "-O1 -fpeel-loops"

[zsojka at seznam dot cz]

------- Comment #5 from zsojka at seznam dot cz  2010-01-18 17:45 -------
$ /mnt/svn/gcc-trunk/binary-155984-lto/bin/g++ -O1 -fpeel-loops -fcompare-debug
pr42642.cpp -c
g++: pr42642.cpp: -fcompare-debug failure

r155984 still fails for me


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42642

[Bug tree-optimization/42642] "-fcompare-debug failure" with "-O1 -fpeel-loops"

[steven at gcc dot gnu dot org]

-- 

steven at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |NEW
   Last reconfirmed|2010-01-07 07:17:23         |2010-01-18 18:31:13
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42642

[Bug tree-optimization/42642] "-fcompare-debug failure" with "-O1 -fpeel-loops"

[steven at gcc dot gnu dot org]

------- Comment #6 from steven at gcc dot gnu dot org  2010-01-18 19:19 -------
Same issue: web renaming a single-USE "web".

*** This bug has been marked as a duplicate of 42685 ***


-- 

steven at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |DUPLICATE


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42642