float conversion to double fail on m68k ?!

[Cliff Tsai]

Hi:
    I've try to test some libm functions on 
m68k platform.
    I have the need to conversion 
a float return value to double.
    for example-> (double) acosf(0).But when I run the code,
    the program fail and system go 
crazy.
    But if I use acos(0) directly,it's 
OK!
    Do somebody know what's the 
problem is?
 
  Thanks! ÂÂ