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Why is _enable_interrupts() not a "RINT" for C64x+ ?

Yulin
Expert 1625 points

I tried in CCS 3.3 and CC4.1.
Why is _enable_interrupts() not a "RINT" for C64x+ ?

;_disable_interrupts()
       DINT                              ; |27|
       NOP             1
;_enable_interrupts()
       MVC     .S2     CSR,B4            ; |29|
       OR      .L2     1,B4,B4           ; |29|
       MVC     .S2     B4,CSR            ; |29|
       NOP             1