On 9/13/2014 2:02 PM, Sven Barth wrote:
It has always worked in this manner. It's just for abbreviating typing, not for combining properties. (and then the with-variant with multiple elements is even more seldomly used than the single-element one...)
In the Turbo Pascal days, WITH allowed for some user-directed compiler optimization. From the TP7 manual:
"In certain situations, Turbo Pascal's code generator can eliminate redundant pointer-load instructions, shrinking the size of the code and allowing for faster execution. When the code generator can guarantee that a particular pointer remains constant over a stretch of linear code (code with no jumps into it), and when that pointer is already loaded into a register pair (such as ES:DI), the code generator eliminates additional redundant pointer-load instructions in that block of code.
A pointer is considered constant if it's obtained from a variable parameter (variable parameters are always passed as pointers) or from the variable reference of a WITH statement. Because of this, using WITH statements is often more efficient (but never less efficient) than writing the fully-qualified variable for each component reference."
-- Jim Leonard (trix...@oldskool.org) Check out some trippy MindCandy: http://www.mindcandydvd.com/ A child borne of the home computer wars: http://trixter.oldskool.org/ You're all insane and trying to steal my magic bag! _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
