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- # Copyright (c) 1988 Bellcore
- # All Rights Reserved
- # Permission is granted to copy or use this program, EXCEPT that it
- # may not be sold for profit, the copyright notice must be reproduced
- # on copies, and credit should be given to Bellcore where it is due.
- # BELLCORE MAKES NO WARRANTY AND ACCEPTS NO LIABILITY FOR THIS PROGRAM.
-
- # $Header: README,v 4.1 88/06/21 13:14:24 bianchi Exp $
- # $Source: /tmp/mgrsrc/src/blit/RCS/README,v $
-
- This is the 68020 bit-blit code using bit field instructions. The 3
- source files are:
-
- * blit.C for bit-blts
- * line.C for lines
- * pixel.C for bliting 'points'
-
- Strategy:
- This is an attempt to build *fast* 68020 specific bit-blit code in an
- operating environment independent fashion. Although the bit-blit code is
- written in a combination of C and assembler, the compiler and assembler
- specific parts are parameterized.
-
- * The files m4.h and asm.h contain the assembler specific syntax for the
- required asms. It would be nice to do this all with cpp, but cpp won't
- do the substitutions inside quoted strings.
-
- * sym - The SYMbolic asm processor permits the reference to C register
- variables from within asm statements. Thus the C compiler is free to
- assign registers as it wishes. Sym filters the "cc -S -g" output
- replacing the symbolic names from the asm's with the proper register
- names by interpreting the symbol table entries grenerated by -g.
- Sym is symbol table entry specific.
-
- * The result asm file is run through the optimizer, which doesn't
- do much, especially as it things all memory references have side-effects.
-
-
- Stephen A. Uhler
-
-