Re: c/3376: optimised code wrong in simple for statement

Re: c/3376: optimised code wrong in simple for statement

[aoliva]

Synopsis: optimised code wrong in simple for statement

State-Changed-From-To: open->closed
State-Changed-By: aoliva
State-Changed-When: Sat Jun 23 00:04:12 2001
State-Changed-Why:
    It seems that you forgot to attach the short test program.
    
    Anyway, 2.96 is not a version of GCC released by the FSF.  To report bugs in the Red Hat version of GCC, use the Red Hat bug reporting program at bugzilla.redhat.com.  But make sure you get the latest update of the GCC RPMs first.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view&pr=3376&database=gcc

c/3376: optimised code wrong in simple for statement

[alatham]

>Number:         3376
>Category:       c
>Synopsis:       optimised code wrong in simple for statement
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    unassigned
>State:          open
>Class:          wrong-code
>Submitter-Id:   net
>Arrival-Date:   Fri Jun 22 10:56:00 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     Allan Latham
>Release:        2.96 Red Hat  (for info: NOT a problem in 2.95.3 Suse)
>Organization:
>Environment:
Red Hat 7.0.1J on i586
>Description:
cc -o Atest Atest.c works as expected
cc -O2 -o Atest Atest.c fails

The optimised version pass only one time thru the loop and reports the answer (variable se) as -1 when it should be 1.

>How-To-Repeat:
Compile and run the short test program with gcc 2.96
>Fix:
Recode as in the example.
>Release-Note:
>Audit-Trail:
>Unformatted: