Le 21/06/2017 à 18:37, Richard Henderson a écrit : > On 06/21/2017 09:18 AM, Philippe Mathieu-Daudé wrote: >>> +typedef CPU_LDoubleU FPReg; >> >> What an awful name... Anyway checking on "qemu/bswap.h" it seems there >> is some endianess issue with it if your host is little-endian. > > There is no endian-ness issue because we do not attempt to read that > structure from memory as a whole. Instead, Laurent uses two big-endian > loads (with appropriate address arithmetic) and stores the result into > this host structure in host-endian order. Further, the host routines > use the structure members by name and do not assume any particular > relationship between them. > >> Do you have a way to run Berkeley TestFloat? > > As noted in Laurent's cover message, floatx80 isn't quite right -- that > is the x86 data type, and the proper m68k data type is slightly different. > > I would expect the results from using floatx80 to be Just Good Enough to > produce a working m68k user-land. It will produce correct results for > normal numbers in arithmetic such as 1.0 + 10.0. But I would expect > many of the edge conditions that TestFloat would attempt (especially > de-normals and un-normals) would fail. >
Thank you Richard. Yes, with floatx80, we can run m68k user-land. I'm going to post the missing instructions. I've also ported TestFloat and SoftFloat to m68k to check the result, it's not perfect but in a good shape. https://github.com/vivier/m68k-testfloat https://github.com/vivier/m68k-softfloat I can compare result from my reference hardware (a real Quadra 800) and qemu-m68k chroot. But I plan to replace the floatx80 by a floatx96 in a near future... Thanks, Laurent
