Re: optimization/7155: AVR Build of GCC - Problem with optimizing

Re: optimization/7155: AVR Build of GCC - Problem with optimizing

[bangerth]

Synopsis: AVR Build of GCC - Problem with optimizing

State-Changed-From-To: open->feedback
State-Changed-By: bangerth
State-Changed-When: Sat Mar 22 17:54:41 2003
State-Changed-Why:
    In order to reproduce this, we need a code sample that is
    self-contained. The snippet you sent has a number of 
    variables that are probably declared somewhere else in your
    program. It doesn't compile without optimization, so we
    can't reproduce the internal compiler error either.
    
    Can you please review
      http://gcc.gnu.org/bugs.html
    and send us a self-contained, preprocessed testcase?
    
    Thanks
      Wolfgang

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=7155

optimization/7155: AVR Build of GCC - Problem with optimizing

[t.nossmann]

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>Number:         7155
>Category:       optimization
>Synopsis:       AVR Build of GCC - Problem with optimizing
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Jun 28 05:56:02 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     t.nossmann@web.de
>Release:        gcc version 3.2 20020616 (experimental)
>Organization:
>Environment:
Win 2000, avrfreaks.net Build
>Description:
avr-gcc -c -g -Os -Wall -Wstrict-prototypes -Wa,-ahlms=bridge.lst  -mmcu=at90s8515 -I. bridge.c -o bridge.o
bridge.c: In function `testfunction':
bridge.c:214: error: unable to generate reloads for:
(insn:QI 56 55 57 12 00712540 (set (cc0)
        (compare (sign_extend:HI (reg/v:QI 25 r25 [41]))
            (const_int -128 [0xffffff80]))) 94 {*cmpqi_sign_extend} (nil)

!!!This Error occours only with optimization enabled!!!
    (nil))
bridge.c:214: internal compiler error: Internal compiler error in find_reloads, at gcc/reload.c:3564
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://www.gnu.org/software/gcc/bugs.html> for instructions.
make: *** [bridge.o] Error 1
>How-To-Repeat:
void testfunction( void )
{
    char ist_speed = 0;
    bool mo_dir_up;
	bool mo_power;


	// Die Drehgeschwindigkeit des Motors langsam an die Vorgabe anpassen
    if (soll_speed > ist_speed)
    	ist_speed++;

    if (soll_speed < ist_speed)
    	ist_speed--;

    mo_dir_up = (ist_speed > 0);

	// aktuellen Motorstatus ermitteln und merken
    mo_power = mo_port != mo_break;

	// Motor ist ausgeschalten und minimale Geschwindigkeit erreicht
	if ( !mo_power && ( ist_speed == 0 ) )
		return;

	// Motor ist eingeschalten und maximale Geschwindigkeit erreicht
    if (  mo_power && ( (ist_speed==0x7f) || (~ist_speed==0x7f) ) )
		return;

    // Neuen Timer-Wert berechnen und laden
   		outp( ((mo_power)? (ist_speed << 1) : (~ist_speed << 1) ) , TCNT0 );

    // kurz alle Brückentransistoren ausschalten, um Kurzschlüsse zu verhindern

	mo_port = mo_stop;
	delay(1);

	// wenn motor eingeschalten, dann ausschalten und umgekehrt ( DREHRICHTUNG beachten !!! )
	if (mo_power)
		mo_port = mo_break;
	else
		mo_port = (mo_dir_up)? mo_up : mo_down;
}
>Fix:
none
>Release-Note:
>Audit-Trail:
>Unformatted: