GetReg and GenCode: Example 2/10
reserved
free
reserved
0,1
2-11
12-15
contents
reg.
in memory
nowhere
a-d
u-z
address
var.
RAT:
AT:
GetReg: R2
Instruction: (1) u:=a-b
Properties: u, a, b: live
GenCode: load R2,a
sub  R2,b
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