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PL.8

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PL.8
Designed by IBM

PL.8 is a dialect of PL/I (Programming Language One) developed by IBM Research in the 1970s by the compiler group, under Martin Hopkins, within a major research program that led to the IBM RISC architecture. [1] The ".8" in the name was intended to suggest it was about 80% of PL/I. [1] Written in PL/I and bootstrapped via the PL/I Optimizing compiler, it was an alternative to PL/S for system programming, compiling initially to an intermediate machine-independent language with symbolic registers and machine-like operations. [2] It applied machine-independent program optimization techniques to this intermediate language to produce exceptionally good object code. The intermediate language was mapped by the back-end to the target machine's register architecture and instruction set. Back-ends were written for IBM 801, S/370, Motorola 68000, [3] [4] and POWER/PowerPC.[ citation needed ]

Use

A version was used on IBM mainframes as a development tool for software that was being designed for the IBM AS/400, as well as to write the "i370" internal code for the "Capitol" chipset used in the IBM 9377 processor and some ES/9370 models [5] [6] and the millicode for S/390 and z/Architecture processors. [7]

References

  1. 1 2 Cocke, John; Markstein, V. (January 1990). "The evolution of RISC technology at IBM" (PDF). IBM Journal of Research & Development. 34 (1). IBM: 4–11. doi:10.1147/rd.341.0004 . Retrieved 6 February 2026.
  2. ↑ The compiler is described in: George Radin (May 1983). "The 801 Minicomputer". IBM Journal of Research and Development. 27 (3): 237–246. doi:10.1147/rd.273.0237.
  3. ↑ Marc Auslander; Martin Hopkins (June 1982). "An Overview of the PL.8 Compiler" (PDF). SIGPLAN Notices. 17 (6).
  4. ↑ Charles H. Ferguson; Charles R. Morris (1993). Computer Wars: The Post-IBM World. Beard Books. p. 44. ISBN   978-1-58798-139-5.
  5. ↑ Maergner, Juergen; Schwermer, Hartmut R. (September 1988). "I370 - a new dimension of microprogramming". ACM SIGMICRO Newsletter. 19 (3): 24–31. doi:10.1145/62185.62189. ISSN   1050-916X. S2CID   2068407.
  6. ↑ Wilhelm Spruth, ed. (6 December 2012). "7.2 High Level Microprogramming in I370". The Design of a Microprocessor. Springer-Verlag. ISBN   978-3-642-74918-6.
  7. ↑ Gellerich, W.; Hendel, T.; Land, R.; Lehmann, H.; Mueller, M.; Oden, P.H.; Penner, H. (May 2004). "The GNU 64-bit PL8 compiler: Toward an open standard environment for firmware development". IBM Journal of Research and Development. 48 (3.4): 543–556. doi:10.1147/rd.483.0543.
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