a.ir

Instructions:
BB [1:LBL_0:-1]
	%v_2 = copy(nil)
	%v_3 = copy(%v_2)
	%t_a_4 = copy(%v_2)
	%v_1 = copy(%v_2)
BB [2:LBL_1:-1]
	%self = recv_self()
	line_num(;n: 2)
	%t_a_4 = copy(Array:[Fixnum:1, Fixnum:2, Fixnum:3])
	line_num(;n: 3)
	binding_store(%t_a_4, a(0:0) ;scope_name: ../snippets/perf3.rb)
	%v_1 = call_1f(%t_a_4, Fixnum:2 ;n:[], t:NO, cl:false)
	%t_a_4 = binding_load(a(0:0) ;scope: ../snippets/perf3.rb)
	%v_2 = call_1f(%t_a_4, Fixnum:1 ;n:[], t:NO, cl:false)
	%t_a_4 = binding_load(a(0:0) ;scope: ../snippets/perf3.rb)
	%v_3 = copy(Array:[%v_1, %v_2])
	%v_2 = to_ary(%v_3)
	%v_3 = masgn_reqd(%v_2 ;index: 0, pre: -1, post: -1)
	attr_assign(%t_a_4, Fixnum:1, %v_3 ;n:[]=, t:UN, cl:false)
	%t_a_4 = binding_load(a(0:0) ;scope: ../snippets/perf3.rb)
	%v_3 = masgn_reqd(%v_2 ;index: 1, pre: -1, post: -1)
	attr_assign(%t_a_4, Fixnum:2, %v_3 ;n:[]=, t:UN, cl:false)
	line_num(;n: 4)
	return(Fixnum:1)
BB [3:LBL_2:-1]

a.rb

a = [1,2,3]
a[1], a[2] = a[2], a[1]
1