tree 06ddb15da5ae722dd67c9a9484b9741185146824
parent 0c4c90929143a530730e2879204a55a30bf63758
author Alex Bennée <alex.bennee@linaro.org> 1515756242 +0000
committer Alex Bennée <alex.bennee@linaro.org> 1519208514 +0000

fpu/softfloat: re-factor sqrt

This is a little bit of a departure from softfloat's original approach
as we skip the estimate step in favour of a straight iteration. There
is a minor optimisation to avoid calculating more bits of precision
than we need however this still brings a performance drop, especially
for float64 operations.

Suggested-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>