On 4/27/07, Richard Guenther <[EMAIL PROTECTED]> wrote:
I think that even with -ffast-math 12 bits accuracy is not ok. There is the possibility of doing another newton iteration step to improve accuracy, that would be ok for -ffast-math. We can, though, add an extra flag -msserecip or however you'd call it to enable use of the instructions with less accuracy.
Which is already done for PPC at least the scalar code, see -mswdiv option. We don't do this for sqrt reciprocal yet but it is easy to special case for the reciprocal case :). -- Pinski
