[Bug debug/42630] New: "-fcompare-debug failure (length)" with "-O1 -fvariable-expansion-in-unroller -funroll-loops"

[Bug debug/42630] New: "-fcompare-debug failure (length)" with "-O1 -fvariable-expansion-in-unroller -funroll-loops"

[zsojka at seznam dot cz]

Can be related to pr42629

Command line:
gcc -O1 -fvariable-expansion-in-unroller -funroll-loops -fcompare-debug -c
testcase.c

Tested revisions (x86_64):
r155643 - crash
r155290 - crash (x86)
r154886 - crash
r153685 - crash

Output:
/mnt/svn/gcc-trunk/binary-155643-lto/bin/gcc -O1
-fvariable-expansion-in-unroller -funroll-loops -fcompare-debug -c testcase.c
gcc: testcase.c: -fcompare-debug failure (length)


-- 
           Summary: "-fcompare-debug failure (length)" with "-O1 -fvariable-
                    expansion-in-unroller -funroll-loops"
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: debug
        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=42630

[Bug debug/42630] "-fcompare-debug failure (length)" with "-O1 -fvariable-expansion-in-unroller -funroll-loops"

[zsojka at seznam dot cz]

------- Comment #1 from zsojka at seznam dot cz  2010-01-06 00:41 -------
Created an attachment (id=19481)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=19481&action=view)
reduced testcase

Command line:
gcc -O1 -fvariable-expansion-in-unroller -funroll-loops -fcompare-debug -c
pr42630.c


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42630

[Bug debug/42630] "-fcompare-debug failure (length)" with "-O1 -fvariable-expansion-in-unroller -funroll-loops"

[steven at gcc dot gnu dot org]

-- 

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         |2010-01-06 08:35:43
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42630

[Bug debug/42630] "-fcompare-debug failure (length)" with "-O1 -fvariable-expansion-in-unroller -funroll-loops"

[aoliva at gcc dot gnu dot org]

------- Comment #2 from aoliva at gcc dot gnu dot org  2010-01-08 07:10 -------
Taking this over, I hoep stevenb doesn't mind I got a patch.


-- 

aoliva at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |steven at gcc dot gnu dot
                   |                            |org
         AssignedTo|steven at gcc dot gnu dot   |aoliva at gcc dot gnu dot
                   |org                         |org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42630

[Bug debug/42630] "-fcompare-debug failure (length)" with "-O1 -fvariable-expansion-in-unroller -funroll-loops"

[stevenb dot gcc at gmail dot com]

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------- Comment #3 from stevenb dot gcc at gmail dot com  2010-01-08 07:31 -------
Subject: Re:  "-fcompare-debug failure (length)" with "-O1 
        -fvariable-expansion-in-unroller -funroll-loops"

> ------- Comment #2 from aoliva at gcc dot gnu dot org  2010-01-08 07:10 -------
> Taking this over, I hoep stevenb doesn't mind I got a patch.

Not at all. You may also want to look at bug 42642. It's another case
where -fno-web helps "fix" a -fcompare-debug issue.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42630

[Bug debug/42630] "-fcompare-debug failure (length)" with "-O1 -fvariable-expansion-in-unroller -funroll-loops"

[aoliva at gcc dot gnu dot org]

------- Comment #4 from aoliva at gcc dot gnu dot org  2010-01-09 14:42 -------
Subject: Bug 42630

Author: aoliva
Date: Sat Jan  9 14:41:35 2010
New Revision: 155764

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=155764
Log:
gcc/ChangeLog:
PR debug/42630
* loop-unroll.c (referenced_in_one_insn_in_loop_p): Count debug
uses in new incoming argument.  Free body.
(reset_debug_uses_in_loop): New.
(analyze_insn_to_expand_var): Call the latter if the former found
anything.  Fix whitespace.  Reject invalid dest overlaps before
going through all insns in the loop.
gcc/testsuite/ChangeLog:
PR debug/42630
* gcc.dg/pr42630.c: New.

Added:
    trunk/gcc/testsuite/gcc.dg/pr42630.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/loop-unroll.c
    trunk/gcc/testsuite/ChangeLog


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42630

[Bug debug/42630] "-fcompare-debug failure (length)" with "-O1 -fvariable-expansion-in-unroller -funroll-loops"

[aoliva at gcc dot gnu dot org]

------- Comment #5 from aoliva at gcc dot gnu dot org  2010-01-09 14:50 -------
Fixed


-- 

aoliva at gcc dot gnu dot org changed:

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


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42630