Is there something similar to use_reg() that can be used with emit_insn()

[William Tambe via Gcc-help <gcc-help@xxxxxxxxxxx>]

Is there something similar to use_reg() that can be used with emit_insn() ? ie:
use_reg (emit_insn(), gen_rtx_REG(REGNO))
The idea being to mark REGNO as being used by the instructions
generated by emit_insn().
So far I have only seen use_reg() being used for function-call rtx;
but is there a similar function that can be used with emit_insn() ?