java/3096: GCJ does not increment

java/3096: GCJ does not increment

[aneesha]

>Number:         3096
>Category:       java
>Synopsis:       GCJ does not increment
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          wrong-code
>Submitter-Id:   net
>Arrival-Date:   Fri Jun 08 16:56:00 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     Aneesh Aggarwal
>Release:        gcc version 3.1 20010601 (experimental)
>Organization:
>Environment:
Linux 2.4 on x86
>Description:
GCJ does not increment the value of an entry in an array when
the increment operator "++" is used in front. It, however,
works when the operator is appended at the end.
>How-To-Repeat:
public class inc_test {
     public static void main(String [] args) {
        long a[];
        a = new long[2];
        for(int i = 0; i < 2; i++) {
                ++a[i];
                System.out.println(" Value " + a[i]);
        }
     }
   }
>Fix:

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

Re: java/3096: GCJ does not increment

[apbianco]

Synopsis: GCJ does not increment

Responsible-Changed-From-To: unassigned->apbianco
Responsible-Changed-By: apbianco
Responsible-Changed-When: Mon Oct  8 11:29:47 2001
Responsible-Changed-Why:
    Mine
State-Changed-From-To: open->feedback
State-Changed-By: apbianco
State-Changed-When: Mon Oct  8 11:29:47 2001
State-Changed-Why:
    A patch has been tested and proposed. I will be checked in as soon as the copyright assignment clears:
    
      http://gcc.gnu.org/ml/java/2001-10/msg00061.html
      

http://sources.redhat.com/cgi-bin/gnatsweb.pl?cmd=view&pr=3096&database=gcc

Re: java/3096: GCJ does not increment

[Alexandre Petit-Bianco]

The following reply was made to PR java/3096; it has been noted by GNATS.

From: Alexandre Petit-Bianco <apbianco@cygnus.com>
To: aneesha@hpl.hp.com
Cc: gcc-gnats@gcc.gnu.org, gcc-bugs@gcc.gnu.org
Subject: Re: java/3096: GCJ does not increment
Date: Wed, 18 Jul 2001 17:26:14 -0700 (PDT)

 aneesha@hpl.hp.com writes:
 
 > GCJ does not increment the value of an entry in an array when
 > the increment operator "++" is used in front. It, however,
 > works when the operator is appended at the end.
 
 The bug manifests itself only when compiling to native, regardless of
 -f{no-}bounds-check. The index has to be a non numeric value.
 
 When I put a breakpoint in expand_expr, I see that in the case of `++a[i]'
 `(reg:SI 72)' is being returned. When `a[i]++' is presented, then
 
   (queued:SI (mem:SI (reg:SI 70) 0)
       (nil)
       (nil)
       (parallel[ 
               (set (mem:SI (reg:SI 70) 0)
                   (plus:SI (mem:SI (reg:SI 70) 0)
                       (const_int 1 [0x1])))
               (clobber (reg:CC 17 flags))
           ] )
       (nil))
   
 is returned. -S shows that no code is generated for `++a[i].'
 
 ./A
 
 class T
 {
   public static void main(String [] args) {
     int a[] = new int[1];
     int i = 0;
     ++a[i];
     System.out.println (a[i]);
   }
 }