Re: target/4959: gcc/s390 fails with more than 1024 function pointers

Re: target/4959: gcc/s390 fails with more than 1024 function pointers

[rth]

Synopsis: gcc/s390 fails with more than 1024 function pointers

Responsible-Changed-From-To: unassigned->uweigand
Responsible-Changed-By: rth
Responsible-Changed-When: Thu Jun 20 16:12:37 2002
Responsible-Changed-Why:
    Didn't you fix something like this for 3.1?

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=4959

Re: target/4959: gcc/s390 fails with more than 1024 function pointers

[uweigand]

Synopsis: gcc/s390 fails with more than 1024 function pointers

State-Changed-From-To: open->closed
State-Changed-By: uweigand
State-Changed-When: Fri Jun 21 05:08:43 2002
State-Changed-Why:
    http://gcc.gnu.org/ml/gcc-patches/2002-06/msg00999.html

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=4959

target/4959: gcc/s390 fails with more than 1024 function pointers

[edward.connell]

>Number:         4959
>Category:       target
>Synopsis:       gcc/s390 fails with more than 1024 function pointers
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Nov 27 10:16:01 PST 2001
>Closed-Date:
>Last-Modified:
>Originator:     edward.connell@sas.com
>Release:        gcc version 2.95.3 20010315 (release)
>Organization:
>Environment:
Linux/s390 native and cross-build
>Description:
gcc fails to compile a file with more than 1024 function pointers with "/var/tmp/cc6ojHFY.s:2073: Error: operand out of range (4096 not between 0 and 4095)".  Gcc is trying to use a relative offset but the distance gets too large.  Imagine the following with N=1025.

****************
int i0();
int i1();
int i2();

int main() {
 int (*funcs[3])();

 funcs[0]=i0;
 funcs[1]=i1;
 funcs[2]=i2;
 return 0;
}
**************

This program will generate a .c file which fails to compile on s390.

**************
#define NUM 1025

int main()
{
 int i;

 for (i=0; i<NUM; i++) {
   printf("int i%d();\n", i);
 }

 printf("\nint main() {\n int (*funcs[%d])();\n\n", NUM);

 for (i=0; i<NUM; i++) {
   printf(" funcs[%d]=i%d;\n", i, i);
 }

 printf(" return 0;\n}\n");

 return 0;
}
**************
>How-To-Repeat:
#define NUM 1025

int main()
{
 int i;

 for (i=0; i<NUM; i++) {
   printf("int i%d();\n", i);
 }

 printf("\nint main() {\n int (*funcs[%d])();\n\n", NUM);

 for (i=0; i<NUM; i++) {
   printf(" funcs[%d]=i%d;\n", i, i);
 }

 printf(" return 0;\n}\n");

 return 0;
}
>Fix:

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