Import iburg.

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 -iburg -- A Code Generator Generator
++mcgg is very heavily based on the iburg code generator by C. W. Fraser, D. R.
++Hanson and T. A. Proebsting, described in ACM Letters on Prog. Languages and
++Systems 1, 3 (Sep. 1992), 213-226:
+ 
 -iburg is a code-generator generator that uses dynamic programming at
 -compile time. It's described in
 -
 -C. W. Fraser, D. R. Hanson and T. A. Proebsting,
 -Engineering a simple, efficient code generator generator,
 -ACM Letters on Prog. Languages and Systems 1, 3 (Sep. 1992), 213-226.
+ http://storage.webhop.net/documents/iburg.pdf
+ 
 -iburg is written in and generates ANSI C and thus must be compiled
 -with an ANSI C compiler and preprocessor, e.g., gcc or lcc. To compile
 -iburg, type "make". There should be no warnings or errors (except
 -perhaps in the system-dependent YACC skeleton). If you need to
 -customize the makefile, edit custom.mk, which is included in makefile.
 -The default custom.mk is empty.
 -
 -sample.brg is from the paper in burg.ps, sample4.brg is from the paper
 -in iburg.ps, and sample5.brg is an example from a compilers course.
 -"make test" runs iburg on sample[45].brg and executes the resulting
 -programs. The output should be something like:
 -
 -% make test
 -./iburg -I sample4.brg sample4.c; cc -o test4 sample4.c; ./test4
 -sample4.c
 -i = c + 4;
 -stmt: ASGNI(disp,reg)
 - disp: ADDRLP
 - reg: disp
 -  disp: ADDI(reg,con)
 -   reg: CVCI(INDIRC(disp))
 -    disp: ADDRLP
 -   con: CNSTI
 -./iburg -I sample5.brg sample5.c; cc -o test5 sample5.c; ./test5
 -sample5.c
 -stm: MOVE(MEM(loc),reg)
 - loc: NAME
 - reg: PLUS(MEM(loc),reg)
 -  loc: PLUS(NAME,reg)
 -   reg: MEM(loc)
 -    loc: NAME
 -  reg: con
 -   con: CONST
 -%
 -
 -To install iburg, copy it and its man page to the appropriate local
 -directories, e.g., on UNIX:
 -
 -% cp iburg /usr/local
 -% cp iburg.1 /usr/local/man/man1
 -
 -"make clobber" removes the executables and all derived files except
 -gram.c; "make clean" removes just object, core, and sample*.c files.
++For the original source, see the iburg-import branch (this is the version with
++all the mcgg extensions).
+ 
 -Mail bug reports along with the shortest input that exposes them to
 -drh@drhanson.net.
++iburg is licensed under the MIT open source license; see the LICENSE file.
+ 
 -$Id$