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63, according to the paper they wrote about it in 1965. https://ibm-1401.info/1401-IBM-Systems-Journal-FORTRAN.html:

“The 1401 FORTRAN compiler has 63 phases, an average of 150 instructions per phase, and a maximum of 300 instructions in any phase.”

The phases aren’t all what I would call a compilation phase, though. For example, phase zero:

“Phase 00 - Snapshot. Loads a snapshot routine into 350 positions of core storage. This routine lists a specified amount of core storage.”



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