Re: [avr-gcc-list] Compiler bug ?

[Denis Chertykov]

"E. Weddington" <address@hidden> writes:

> On 16 Apr 2003 at 15:14, Larry Barello wrote:
> 
> > avr-gcc -S -Os -fno-reorder-blocks -Wall -g -mmcu=attiny26 foo.c -o
> > foo.s foo.c: In function `DoDeadBand': foo.c:21: error: unable to
> > generate reloads for: (insn:QI 31 28 32 2 006B7390 (set (cc0)
> >         (compare (sign_extend:HI (reg/v:QI 24 r24 [42]))
> >             (const_int -20 [0xffffffec]))) 94 {*cmpqi_sign_extend}
> > (nil)
> >     (nil))
> > foo.c:21: internal compiler error: in find_reloads, at
> > gcc/reload.c:3636
> > Please submit a full bug report,
> > with preprocessed source if appropriate.
> > See <URL:http://www.gnu.org/software/gcc/bugs.html> for instructions.
> > make: *** [foo.s] Error 1
> > 
> > 
> > ---- Winavr Version -----
> > 
> > Reading specs from c:\WinAVR\bin\..\lib\gcc-lib\avr\3.3\specs
> > Configured with:
> > ../configure --prefix=/e/avrdev/install --target=avr --enable-language
> > s=c,c++ --disable-nls Thread model: single gcc version 3.3 20030310
> > (prerelease)
> > 
> > --- foo.c ---
> > 
> > #define DEADBAND_LOW (20)     // +/-20 us
> > 
> > char DoDeadBand(char raw)
> > {
> >     char deadband;
> > 
> >     deadband = DEADBAND_LOW;
> > 
> >     if (raw > deadband)
> >     {
> >         return raw - deadband;
> >     }
> >     else if (raw < -deadband)
> >     {
> >         return raw + deadband;
> >     }
> >     else
> >     {
> >         return 0;
> >     }
> > }
> > 
> 
> I was able to reproduce it here, even with specifying -
> mmcu=atmega128.
> 
> However, the error goes away if you specify
> -funsigned-char.
> 
> I'm trying to get a new WinAVR release out this week to address 
> another compiler bug that was reported on avr-gcc-list earlier.

Please ! Collect all bugs in avr-gcc and send to me. I will try
to fix all bugs.

Denis.