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XPL    
A small dialect of {PL/I} used for compiler writing from
Stanford, 1967-69. XPL has
one-dimensional {arrays}. I/O is achieved with character
pseudo-variable INPUT and OUTPUT, e.g.

OUTPUT = 'This is a line';

It has inline {machine code}. "Programmers are given all the
rope they ask for. Novices tend to hang themselves fairly
frequently." XPL has been implemented on {IBM 360}, {Univac
1100}, {ICL System 4}, {CDC 6000} and {Cyber} series, {XDS
Sigma-5} and {Sigma-7} and {DEC} {PDP-10}.

An optimising XPL compiler (version 1) by Robin Vowels
is a standard implementation of XPL
and is based on McKeeman, Horning, and Wortman's improved
{XCOM} (which employs hashed symbol table generation). It
includes the extra built-in function COREHALFWORD.

The following areas have been optimised: procedures calls when
the argument and corresponding parameter are of the same type,
and when the argument is a constant; constant subscripts; use
of CORELHALFWORD and COREWORD; string constants of length one;
iterative DO statements by transferring code to the end of the
loop.

String constants of length one do not require a descriptor,
hence more descriptors are available for string variables.
Comparison operations are treated as commutative, and an
improved Commute algorithm is used. Halfword instructions are
generated for BIT(16) variables.

These areas have been improved or re-written: calls on OUTPUT,
catenation, integer-to-string conversion, multiply, divide,
and MOD. An emitter for SS-type instructions has been added.
The compiler achieves an 11% reduction in object code
compiling itself, an 11% increase in compilation rate, a 55%
increase in compilation speed when the $E toggle is set.
Special treatment for catenating a string to an integer
substantially decreases consumption of the free string area,
and decreases string moves. The latter improvement is most
noticeable on small core machines.

Core requirements: less than the improved XCOM on which it is
based (approx. 98000 bytes). Symbol table size is 468.
Ported to {IBM} {System 370}. The compiler is written in XPL.
The code generators are machine-specific.

["A Compiler Generator," W.M. McKeeman et al, P-H 1970].

[JCC, AFIPS 1968].

(1993-08-07)


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  • Plasma’s XPL Token Sale Sells Out in Minutes, Raising $500 . . .
    The frenzy surrounding the XPL sale caused significant congestion on the Ethereum network, with some participants reportedly spending over $100,000 in gas fees to secure their token allocation Data from Arkham indicates that network usage spiked sharply during the sale window, underscoring the intensity of demand and highlighting ongoing
  • Plasma Listing Details: Launch Date and Where to Buy $XPL
    XPL is used to pay transaction fees, secure the network through staking, support governance decisions, and participate in liquidity incentives 2 When will Plasma (XPL) be listed? Plasma (XPL) is expected to be listed on leading exchanges in July 2025, with deposits, trading, and withdrawals launching in phases Official announcements will
  • Announcing the XPL Public Sale, using Sonar by Echo
    For example, if your guaranteed allocation is $100, you can commit $200 to purchase more XPL than guaranteed 10% of the total XPL supply will be sold at a $500 million fully diluted network valuation; US participants must verify their accredited investor status to participate ‍ 4 Mainnet Beta ‍ When Plasma Mainnet Beta launches:
  • Plasmas XPL Token Sale Attracts $500M as Investors Chase . . .
    Over 1,100 wallets participated in the sale of Plasma’s XPL token, with a median allocation of roughly $35,000, the company said in an X post The offering was conducted on Sonar, a public token sale platform built by Echo, a crypto-focused private fundraising startup led by prominent investor Cobie
  • XPL Token Sale Raises $500M, Signaling Strong Appetite for . . .
    Plasma Secures $500M in Oversubscribed Token Sale Amid Stablecoin Infrastructure Boom Plasma, a blockchain startup building a Bitcoin-linked stablecoin platform, raised $500 million in a public token sale Monday—10x its original fundraising target—highlighting the accelerating investor demand for projects tied to the stablecoin economy
  • Turner Launches xPL Offsite, an In-House Manufacturing and . . .
    JM Eagle 5200 West Century Boulevard Los Angeles, CA 90045 800-621-4404
  • XRP News: XploraDEX $XPL Token Sparks Investor Surge as . . .
    ZURICH, Switzerland, March 28, 2025 (GLOBE NEWSWIRE) -- The XRP





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