Laurent Vivier <laur...@vivier.eu> writes: > Implement fmod, frem, fscale, fgetman and fgetexp. > > Instead of using functions of libm (v1 of this series) > and converting between host long double and floatx80 type > the new version (v2) adds new floatx80 functions in softfloat.
68k used 80bit float, well TIL ;-) Just for reference Richard and I did a sprint on hacking the softfloat last week. The results are currently brewing in: https://github.com/stsquad/qemu/tree/softfloat-and-arm-fp16-v2 The main push has been to decompose 16/32/64 bit floats and have a common set of operations. This means we work with an internal 64 bit fractional part and then just round appropriately when we pack the result. It's a big departure from SoftFloat2a but seeing as we are not likely to bring in changes from upstream we felt it was worth it from a code clarity point of view. However we have punted touching the 80bit code and any potential quad-precision stuff to a later date, preferably when int128_t is easier to use. Perhaps it is worth considering that option now? > > All the floatx80 functions are copied from "Previous", > the NeXT Computer Emulator, and written by Andreas Grabher. > > Laurent Vivier (5): > softfloat: add floatx80_mod() > target/m68k: add fmod/frem > softfloat: use floatx80_infinity in softfloat > softfloat: add floatx80_getman(), floatx80_getexp(), floatx80_scale() > target-m68k: add fscale, fgetman and fgetexp > > fpu/softfloat-specialize.h | 29 +++++ > fpu/softfloat.c | 258 > ++++++++++++++++++++++++++++++++++++++++++--- > include/fpu/softfloat.h | 13 ++- > target/m68k/cpu.h | 1 + > target/m68k/fpu_helper.c | 48 +++++++++ > target/m68k/helper.h | 5 + > target/m68k/translate.c | 15 +++ > 7 files changed, 355 insertions(+), 14 deletions(-) -- Alex Bennée
