Re: c/9544: buggy prolog code generation for functions, make room for local vars

Re: c/9544: buggy prolog code generation for functions, make room for local vars

[giovannibajo]

Synopsis: buggy prolog code generation for functions, make room for local vars

State-Changed-From-To: feedback->closed
State-Changed-By: bajo
State-Changed-When: Sat May 10 07:51:24 2003
State-Changed-Why:
    No feedback, 3 months.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=9544

Re: c/9544: buggy prolog code generation for functions, make room for local vars

[bangerth]

Synopsis: buggy prolog code generation for functions, make room for local vars

State-Changed-From-To: open->feedback
State-Changed-By: bangerth
State-Changed-When: Mon Feb  3 16:44:02 2003
State-Changed-Why:
    gcc 2.95 is a rather old release. Is there any possibility 
    that you test this with a newer version of gcc, say 3.2.1?
    
    Also, which is the exact platform (operating system and
    cpu) on which this problem occurs?
    
    Thanks
      Wolfgang

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=9544

c/9544: buggy prolog code generation for functions, make room for local vars

[reza_agha]

>Number:         9544
>Category:       c
>Synopsis:       buggy prolog code generation for functions, make room for local vars
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          wrong-code
>Submitter-Id:   net
>Arrival-Date:   Mon Feb 03 13:46:01 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator:     Reza A. Naini
>Release:        2.95.2 19991024 (release)   AVR version
>Organization:
>Environment:
Win2K
>Description:
the prolog code of function when want to make room for local variables, is buggy.
void aFunction(void)
{
    char localVars[100];
}
is translated to:
	in	r0,SREG
	cli		<----
	preperation code for local variables
	sei		<---- BUG!
the I (interrupt) flag is set at beginning of this function.
>How-To-Repeat:
char global[100];

void aFunction(void)
{
   char local[100];
   int  i;
   for(i=0; i<100; i++)
      global[i] = local[i];
}
>Fix:
prolog code must be:
   in r0,SREG
   cli
   .......
   out SREG,r0    <---- Fix!
>Release-Note:
>Audit-Trail:
>Unformatted: