Note: This is a beta release of Red Hat Bugzilla 5.0. The data contained within is a snapshot of the live data so any changes you make will not be reflected in the production Bugzilla. Also email is disabled so feel free to test any aspect of the site that you want. File any problems you find or give feedback here.

Bug 6855

Summary: An egcc optimizer bug
Product: [Retired] Red Hat Linux Reporter: ezharkov
Component: egcsAssignee: Cristian Gafton <gafton>
Status: CLOSED RAWHIDE QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: 6.0CC: ezharkov
Target Milestone: ---   
Target Release: ---   
Hardware: i386   
OS: Linux   
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2000-02-05 18:59:46 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:

Description ezharkov 1999-11-09 18:16:21 UTC
The following program:

tcsh> cat bug.c
#include <stdio.h>
#include <stdlib.h>

union u {
  unsigned i;
  struct {
    unsigned low : 16;
    unsigned high : 16;
  } s;

static void cvt (unsigned *v) {
  union u u;
  u.i = *v;
  u.s.low = 3;
  memcpy (v, &u.i, sizeof (unsigned));

int main () {
  unsigned i = 0x00010002;
  cvt (&i);
  printf ("res = %08x\n", i);
  return EXIT_SUCCESS;

Compiled on:

tcsh> uname -a
Linux hostname 2.2.12 #3 SMP Thu Sep 2 03:34:03 MDT 1999
i586 unknown

Using cc:

tcsh> cc --version

With the command:

tcsh> cc -O1 -o bug bug.c

Produces the following result:

tcsh> ./bug
res = 00000003

I would prefer it to produce a "00010003" result.

Comment 1 Jim Kingdon 1999-11-09 21:52:59 UTC
At first glance this looks like the same bug as 5184 (also see, which for reference concerns
the "addressof" feature within GCC.

Comment 2 Bill Nottingham 2000-02-05 18:59:59 UTC
Fixed in the egcs currently in Raw Hide.