Hi Steffen,
one feature of crlibm is that it does not use current FPU rounding mode status, but has explicit functions for each rounding mode.
That might be more convenient than switching FPU rounding mode for interval arithmetic for example.
As for the rounding mode, I think that the VM itself does interfere
For example in:
there is the following definition:
#define FPU_DEFAULT (_RC_NEAR + _PC_53 + _EM_INVALID + _EM_ZERODIVIDE + _EM_OVERFLOW + _EM_UNDERFLOW + _EM_INEXACT + _EM_DENORMAL)
and a
_controlfp(FPU_DEFAULT, _MCW_EM | _MCW_RC | _MCW_PC | _MCW_IC);
in
squeakExceptionHandler
This is for windows VM but I'm sure we can find similar things in linux/mac