Re: Inline assembler fallback for _FPU_SETCW() missing in MINGW libraries (issue 577450043 by address@hidden)

[Masamichi Hosoda]

>>> You provided a lot of good information in your post, but the
>>> conclusion was not entirely clear.
>>> Are you suggesting requiring SSE2 at this time?
>> 
>> Yes.  It appears to get used anyway for 64bit executables, and it seems
>> safe enough to demand it for 32bit executables.
> 
> +1
> far better than inline asm poking control registers

The cause of the issues is that
the unexpected precision conversions raises small difference
in floating-point calculation.

If libguile uses x87 FPU, high-precision calculation
and low-precision calculation coexist inside GUILE,
and precision conversion occurs between them.

Even if C++ uses SSE2,
libguile and other shared libraries still may use x87 FPU.

I wonder this may cause problems.