[libre-riscv-dev] [isa-dev] Re: FP transcendentals (trigonometry, root/exp/log) proposal

lkcl luke.leighton at gmail.com
Thu Aug 8 13:37:48 BST 2019

On Thursday, August 8, 2019 at 7:56:15 PM UTC+8, Jacob Lifshay wrote:

> One more part: hw can implement a less accurate mode as if a more accurate mode was selected, so, for example, hw can implement all modes using hw that produces correctly-rounded results (which will be the most accurate mode defined) and just ignore the mode field since correct-rounding is not less accurate than any of the defined modes.

Hmm don't know. Hendrik pointed out that Ahmdahl / IBM370 mainframe problem that extra accuracy caused.

I don't know if that lesson from history matters [in 2019].

No clue. Don't know enough to offer an opinion either way. Anyone any recommendations?


More information about the libre-riscv-dev mailing list