Hi Torbjörn, On 2/26/21 3:20 PM, Torbjörn Granlund wrote: > Torbjörn Granlund <t...@gmplib.org> writes: > > Ehum. That failure was apparently due to a qemu bug. Sorry. > > I tested qemu 4.2.0 and qemu 5.2.0. The latter does not work at all, > not even for "ls" or "cat". The former runs submul_1 for a while, but > ultimately reports an error. The error is not reproducible.
Thanks for reporting your findings. I have run all tests with my patches on Z hardware, on CPU generations z13 through z15. Which test case did you see failing in qemu 4.2.0? devel/anymul or try? Which distribution and/or image did you try in qemu 5.2.0? That falling apart is just sad. > This is on a server system with ECC. It is either some problems in your > submul_1, e.g. incorrect handling of callee-saves registers, or an > uninitialised register or flag, or a bug in qemu. I'll setup stress testing in QEMU (and more on hardware) and attempt to reproduce. In the meantime, I've been working on a software pipelined variant of addmul_1, which improves significantly over my previous patch. That is C with inline assembly, which helps somewhat with the increased complexity. It needs more tuning and stress testing, though. Marius -- Marius Hillenbrand Linux on Z development IBM Deutschland Research & Development GmbH Vors. des Aufsichtsrats: Gregor Pillen / Geschäftsführung: Dirk Wittkopp Sitz der Gesellschaft: Böblingen / Registergericht: Amtsgericht Stuttgart, HRB 243294 _______________________________________________ gmp-devel mailing list gmp-devel@gmplib.org https://gmplib.org/mailman/listinfo/gmp-devel
