[Direct threaded code, Bell, Comm. ACM 16:370-2 1973] involves the generation of code consisting of … [p. 331] [Indirect threaded code] consists of a linear list of … [to blocks of words and data values] … [library] routines to be executed. … [Unlike DTC,] ITC does not involve the compilation of … ITC may be generated in an essentially machine … [Both space and interpretation time are reduced.]
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