[gccsdk] [Bug 255] New: GCC 4.7.4 Rel 1 Dev 2014-05-29: infinite loop with level 2 optimisation

bugzilla-daemon at riscos.info bugzilla-daemon at riscos.info
Sat Jul 19 08:31:24 PDT 2014


http://www.riscos.info/bugzilla3/show_bug.cgi?id=255

           Summary: GCC 4.7.4 Rel 1 Dev 2014-05-29: infinite loop with
                    level 2 optimisation
           Product: GCC/GCCSDK
           Version: other
          Platform: Other
        OS/Version: RISC OS
            Status: NEW
          Severity: normal
          Priority: P1
         Component: C compiler
        AssignedTo: John.Tytgat at aaug.net
        ReportedBy: duncan.moore at gmx.com
   Estimated Hours: 0.0


gcc (GCCSDK GCC 4.7.4 Release 1 Development) 4.7.4 20140529 (prerelease)
[gcc-4_7-branch revision 211052]
SharedUnixLibrary 1.12
VirtualRPC-Adjust RISCOS 4.39, ARM 710

I've previously reported this problem on the GCC mailing list (thread "GCC
4.7.4 Rel 1 Dev 2014-01-08: initial comments and feedback" starting 2014-02-27,
where there's more information), but thought I'd put it in the bug tracking
system so it doesn't get forgotten.

With this program:

#include <stdio.h>
int main(void) {
  int i;
  for (i=0;i<6;++i)
    printf("%i\n",i);
  return 0;
}

I get an infinite loop with -O2 optimisation:

*gcc abc.c -O2
*a/out
0
1
2
3
4
5
6
7
8
9
10
11
12
etc

With -O1 or -O3 optimisation, it works properly and just prints the integers 0
to 5.
As far as I know, no one else has been able to reproduce this.

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