On Fri, Jan 18, 2013 at 12:18:20AM +0000, Thorsten Glaser wrote:
> Bill Allombert dixit:
>
> >To start with, could you retry the build with DEB_BUILD_OPTIONS=noopt ?
>
> Builds fine. I can upload that, if it helps.
I think I found the problem:
the fonction convi in src/kernel/gmp/mp.c is miscompiled.
Precisely the line
lz = (8+llz)/9;
set lz to a wrong value: llz=29 and we get back lz=477218590.
The generated code is
.loc 2 1298 0
move.l %d2,%d7
addq.l #8,%d7
move.l %d7,%d3
.LVL2132:
muls.l #954437177,%d3:%d3
asr.l #1,%d3
add.l %d7,%d7
subx.l %d7,%d7
sub.l %d7,%d3
As far as I understand 68k asm, muls.l #954437177,%d3:%d3 is not valid:
it is using twice the same register. See <http://68k.hax.com/MULS>
"If Dh = Dl and Size is one, the results of the operation are undefined."
Cheers,
Bill.
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