#2761 FATAL ICE: Symbol in register, but no register assigned.

[Paolo Pisati]

I was happily compiling FUZIX with #10438, when i decided to update to today's #10444:

~/FUZIX/Applications/V7/cmd$ sdcc -mz80 -I/opt/fcc/include/ -c ed.c
...
ed.c:834: error 9: FATAL Compiler Internal Error in file 'gen.c' line number '1618' : Symbol in register, but no register assigned.
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Symbol iTemp4 at ic 7.
ed.c:834: error 9: FATAL Compiler Internal Error in file 'gen.c' line number '1618' : Symbol in register, but no register assigned.
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Symbol iTemp4 at ic 7.
ed.c:834: error 9: FATAL Compiler Internal Error in file 'gen.c' line number '605' : code generator internal error
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Caught signal 11: SIGSEGV

$ sdcc -v
SDCC : mcs51/z80/z180/r2k/r3ka/gbz80/tlcs90/ds390/pic16/pic14/TININative/ds400/hc08/s08/stm8 3.7.1 #10443 (Linux)
published under GNU General Public License (GPL)

it says #10443 while it should say #10444.

To get the include in /opt/fcc/include/ , you need to build FUZIX ltools (see root's Makefile).

[Paolo Pisati]

Ok, i bisected it down to #10442: that is the revision that introduced the above ICE - hope that helps.

[Alan Cox]

BTW it's helpful if you run the app through sdcc as a C pre-processor and capture the pre-processor output and attach it. That allows the maintainers to just feed it into sdcc and debug it without having the relevant environment.

[Philipp Klaus Krause]

Small code sample to reproduce this issue:

int *dot;
int *dol;
int fchange;

void rdelete(int *ad1, int *ad2)
{
    register int  *a1, *a2, *a3;

    a1 = ad1;
    a2 = ad2+1;
    a3 = dol;
    dol -= a2 - a1;
    do {
        *a1++ = *a2++;
    } while (a2 <= a3);
    a1 = ad1;
    if (a1 > dol)
        a1 = dol;
    dot = a1;
    fchange = 1;
}

Philipp

[Philipp Klaus Krause]

The small reproduce compiles fine for stm8 and mcs51. This seems to be a z80-specific issue; probably a preexisting one triggered by the changes in [10442].

Philipp

[Philipp Klaus Krause]

Fixed in [r10445].

Philipp