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* c/1918: A called function incorrectly accesses args in a list of 16 arguments
@ 2001-04-01  0:00 modur
  0 siblings, 0 replies; only message in thread
From: modur @ 2001-04-01  0:00 UTC (permalink / raw)
  To: gcc-gnats; +Cc: andyj, lehotsky, lehotsky

>Number:         1918
>Category:       c
>Synopsis:       A called function incorrectly accesses args in a list of 16 arguments
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Feb 08 16:36:00 PST 2001
>Closed-Date:
>Last-Modified:
>Originator:     Modur L. Mohan
>Release:        GNU C version 2.95.2 19991024
>Organization:
>Environment:
Compiled with no optimization.
Target code: PowerPC 603e
Compiled on Solaris 5.5.1
The compiler was configured for target powerpc-eabi from
gcc-2.95.2
>Description:
The problem occurs with gcc-2.95.2, but not with gcc-2.8.1.
In the attached test.540.i file:

'main' calls 'foo' with 16 args, all are int's except two
which are double float's.  The double float args are in arg
position 10 and 12.

'foo' accesses arg 11, arg 13 and up at incorrect offsets

The correct output should be:
01:1
02:2
03:3
04:4
05:5
06:6
07:7
08:8
09:9
10:10.100000
11:11
12:12.120000
13:13
14:14
15:15
16:16


Instead, the actual output is:

01:1
02:2
03:3
04:4
05:5
06:6
07:7
08:8
09:9
10:10.100000
11:13
12:12.120000
13:15
14:16
15:0
16:268810208


>How-To-Repeat:
Compile with the following switches:

cc1 <given i> -quiet -dumpbase test.c -fsigned-char -ansi
 -msdata=none -Wimport -W -Wimplicit -Wreturn-type -Wunused
 -Wswitch -Wcomment -Wtrigraphs -Wformat -Wchar-subscripts
 -Wparentheses -Wno-long-long -Wstrict-prototypes
 -Wmissing-prototypes -O0 -version -finhibit-size-directive
 -o test.sppc
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:
----gnatsweb-attachment----
Content-Type: application/octet-stream; name="test.i"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="test.i"

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>From pme@gcc.gnu.org Sun Apr 01 00:00:00 2001
From: pme@gcc.gnu.org
To: pme@gcc.gnu.org
Cc: gcc-prs@gcc.gnu.org
Subject: Re: web/2304
Date: Sun, 01 Apr 2001 00:00:00 -0000
Message-id: <20010317001601.27867.qmail@sourceware.cygnus.com>
X-SW-Source: 2001-q1/msg02411.html
Content-length: 709

The following reply was made to PR web/2304; it has been noted by GNATS.

From: pme@gcc.gnu.org
To: dkorn@pixelpower.com, gcc-gnats@gcc.gnu.org, gerald@gcc.gnu.org,
  pme@gcc.gnu.org
Cc:  
Subject: Re: web/2304
Date: 17 Mar 2001 00:13:23 -0000

 Synopsis: Broken link on http://gcc.gnu.org/onlinedocs/
 
 Responsible-Changed-From-To: gerald->pme
 Responsible-Changed-By: pme
 Responsible-Changed-When: Fri Mar 16 16:13:23 2001
 Responsible-Changed-Why:
     Because I could.
 State-Changed-From-To: open->closed
 State-Changed-By: pme
 State-Changed-When: Fri Mar 16 16:13:23 2001
 State-Changed-Why:
     Known problem, already fixed.
 
 http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view&pr=2304&database=gcc


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