Re: gm2 frontend in gcc 14 (fedora 40) bug

[Michael Riedl]

Gerald,

may I ask you to run the code attached (amended your code with a short 
test) - just to check if we are not fooled by faulty IO-Routines.

Don't assume this is the case, but just to be sure.

And is the result "reproducible" if you use another right or left hand 
side for the linear system ?

Gruß

Michael

PS: Gaius, if needed, I can send you the updated code (and test 
routines) from my library to check other numerical code.

Am 26.04.24 um 11:10 schrieb Gerald Kasner:
> Hi all,
>
> a quick test with gm2 (GCC) 14.0.1 20240411 (Red Hat 14.0.1-0) gave
>
> wrong results with a simple Gaussian elimination, while older 
> gm2-frontends
>
> (gm2 (GCC) 13.2.1 20240316 (Red Hat 13.2.1-7)) give correct results
>
> test compiled with:
>
> gm2 -O2 -fiso testgauss.mod -lm
>
> Result with version 13.2.1 :
>
>       125.000000000000369482222595252097
>     -2880.000000000007275957614183425903
>     14490.000000000032741809263825416565
>    -24640.000000000047293724492192268372
>     13230.000000000023646862246096134186
>
> Result with 14.0.1:
>
>          1.000000000000000000000000000000
>         1.500000000000000000000000000000
>         1.166666666666666740681534975010
>    -24640.000000000047293724492192268372
>     13230.000000000023646862246096134186
>
> With  pivoted Gaussian elimination, the first three are NaN's.
>
> Any idea's ???
>
> testgauss.mod is attached here.
>
> Regards, Gerald

testgauss2.mod
Description: audio/mod