Re: optimization/2076: scheduler ignores data dependency

Re: optimization/2076: scheduler ignores data dependency

[dje]

Synopsis: scheduler ignores data dependency

Responsible-Changed-From-To: unassigned->dje
Responsible-Changed-By: dje
Responsible-Changed-When: Mon Jun 11 10:13:39 2001
Responsible-Changed-Why:
    Because
State-Changed-From-To: analyzed->closed
State-Changed-By: dje
State-Changed-When: Mon Jun 11 10:13:39 2001
State-Changed-Why:
    Patch from Dale Johanssen

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view&pr=2076&database=gcc

optimization/2076: scheduler ignores data dependency

[dje]

>Number:         2076
>Category:       optimization
>Synopsis:       scheduler ignores data dependency
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Feb 23 14:46:00 PST 2001
>Closed-Date:
>Last-Modified:
>Originator:     dje@watson.ibm.com
>Release:        gcc-3.0 20010222 (prerelease)
>Organization:
>Environment:
rs6000-ibm-aix4.3.3.0
>Description:
c-torture/execute/980205.c demonstrates a bug where the
first scheduler pass moves a load of a parameter from the
stack argument area before the parameter has been spilled
to the argument area.  Compiler pass 980205.c.16.regmove
shows the arguments spilled to the argument area before
FP pseudo is loaded.  After the scheduling pass, the load
from the pseudo has been moved to the beginning of the
basic block before the argument area on the stack is valid.
>How-To-Repeat:

>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: