define_split rtl template usage

[raja.saleru@xxxxxxxxxxxxxx]

Hi,

How can I split the below assembly line using define_split RTL template
<1> rd = dps

into the below two liens

<2>
rd = dps
rd = signext(rdhl)

Here rd is 40-bit register
dps is 32-bit register contains the address

Here register name can be r1, r2 ... rd.  and
dp1, dp2, .....dps

sigext(rdhl) is the sign extending from 32-bit to 40bit.

Regards
Raja