[Bug target/36898] New: Insufficient qp-mutex declarations

[Bug target/36898] New: Insufficient qp-mutex declarations

[schwab at suse dot de]

The attached test case is causing a spurious dependency violation message from
the assembler.  The problem seems to be that the assembler is clearing all qp
mutex relations after a call, but the compiler does not emit .pred.rel.mutex
after them.

$ gcc -O2 -c -save-temps xdisp.c
xdisp.s: Assembler messages:
xdisp.s:114: Warning: Use of 'mov' may violate WAW dependency 'GR%, % in 1 -
127' (impliedf), specific resource number is 16
xdisp.s:113: Warning: This is the location of the conflicting usage


-- 
           Summary: Insufficient qp-mutex declarations
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: schwab at suse dot de
GCC target triplet: ia64-*-*


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36898

[Bug target/36898] Insufficient qp-mutex declarations

[schwab at suse dot de]

------- Comment #1 from schwab at suse dot de  2008-07-22 13:34 -------
Created an attachment (id=15939)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=15939&action=view)
Testcase


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36898

[Bug target/36898] Insufficient qp-mutex declarations

[schwab at suse dot de]

------- Comment #2 from schwab at suse dot de  2008-07-22 13:35 -------
Created an attachment (id=15940)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=15940&action=view)
Assembler output


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36898

[Bug target/36898] Insufficient qp-mutex declarations

[sje at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36898

--- Comment #3 from Steve Ellcey <sje at gcc dot gnu.org> 2010-10-18 21:34:51 UTC ---
Author: sje
Date: Mon Oct 18 21:34:46 2010
New Revision: 165664

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=165664
Log:
2010-10-18  Steve Ellcey  <sje@cup.hp.com>

    PR target/36898
    PR middle-end/43760
    * config/ia64/ia64.c (rws_access_regno): Remove predicate check.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/ia64/ia64.c

[Bug target/36898] Insufficient qp-mutex declarations

[sje at cup dot hp.com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36898

Steve Ellcey <sje at cup dot hp.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
                 CC|                            |sje at cup dot hp.com
         Resolution|                            |FIXED

--- Comment #4 from Steve Ellcey <sje at cup dot hp.com> 2010-10-18 21:49:10 UTC ---
Resolved by making IA64 more conservative in its bundling and not putting
multiple (predicated) instructions in one bundle if they read/write the same
register.