Printing rtl instruction name

[Abdul Wahid Memon <engrwahidmemon@xxxxxxxxx>]

Considering the following rtx

(insn 123 122 125 3 (set (reg:DI 531 [ pretmp.143 ])
        (sign_extend:DI (reg/v:SI 594 [ stride ]))) sum.c:19 126
{*extendsidi2_rex64}
     (nil))

Is there any function available in RTL API which could extract the
instruction name i.e. extendsidi2_rex64?

Regards

Abdul