copt - peephole optimizer
copt file ...
copt is a general-purpose peephole optimizer. It reads code from its
standard input and writes an improved version to its standard output.
copy reads the named files for its optimizations, which are encoded as
<pattern for input line 1>
<pattern for input line 2>
<pattern for input line n>
<pattern for output line 1>
<pattern for output line 2>
<pattern for output line m>
Pattern matching uses literal string comparison, with one exception:
‘‘%%’’ matches the ‘‘%’’ character, and ‘‘%’’ followed by a digit
matches everything up to the next occurrence of the next pattern
character, though all occurrences of %n must denote the same string.
For example, the pattern ‘‘%1=%1.’’ matches exactly those strings that
begin with a string X, followed by a ‘‘=’’ (the first), followed by a
second occurrence of X, followed by a period. In this way, the
commands copt to replace runs like
Note that a tab or newline can terminate a %n variable.
copt compares each run of input patterns with the current input
instruction and its predecessors. If no match is found, it advances to
the next input instruction and tries again. Otherwise, it replaces the
input instructions with the corresponding output patterns, pattern
variables instantiated,and resumes its search with the first
instruction of the replacement. copt matches input patterns in reverse
order to cascade optimizations without backing up.
Errors in optimization files are always possible.
z88dk(1), z88dk-zcc(1), z88dk-z80asm(1), z88dk-appmake(1), z88dk-
z88dk was written by Dominic Morris <email@example.com>, and others.
01 December 2009 copt(1)