Re: [PATCH] math-emu: correct test for downshifting fraction in _FP_FROM_INT()

On Tue, 20 Jul 2010 00:12:02 +0200
Mikael Pettersson [off-list ref] wrote:

Unfortunately it seems difficult to write a generic module
which uses math-emu:
- <math-emu/soft-fp.h> includes <asm/sfp-machine.h>,
  but only a handful of archs have it
- <asm/sfp-machine.h> isn't always self-contained and may depend
  on various $arch-specific declarations being present

The given test module works on sparc64 and ppc64, where it uses
the kernel's sfp-machine.h, and on x86 where it uses a stub
sfp-machine.h supplied by itself.  I tried to cross-compile it
for alpha, but that failed due to its sfp-machine.h not being
self-contained.  I didn't try sh or s390.

It would be challange to try this on s390. The math emulation code is
only used for really old 31 bit machines. Starting with the G5 the fpu
can do IEEE754, I would say the math emulation code is irrelevant for
s390 by now.

-- 
blue skies,
   Martin.

"Reality continues to ruin my life." - Calvin.