target-ppc: VSX Stage 4: Add xsresp This patch adds the VSX Scalar Reciprocal Estimate Single Precision (xsresp) instruction. The existing VSX_RE macro is modified to support rounding of the intermediate double precision result to single precision. Signed-off-by: Tom Musta <tommusta@gmail.com> Reviewed-by: Richard Henderson <rth@twiddle.net> Signed-off-by: Alexander Graf <agraf@suse.de>