By Richard Goodman
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Extra resources for Annual review in automatic programming. 4
Transfers of 54 Peter Naur program in GIER ALGOL, on the other hand, are done automatically by the system. The decision to provide automatic transfers of program, but not of variables, is based on the following considerations: 1. The programmer will be fully aware of the storage demands made by the variables of his program, but will have only a very inaccurate knowledge of the length of the code needed to represent the algorithms. Therefore the programmer's task of specifying the transfers of variables is much easier than the specification of transfers of program.
4 However, we have since then realized that this approach has serious disadvantages. The point is that a block by definition is a unit with respect to the scope of its identifiers. However, what we need for segmentation is the dynamic units of the program. These are rather difficult to detect at translate time. In simple cases the most important dynamic units are small loops comprising much less than a block. In fact, the first part of a block is usually just initialization which is devoid of interest as soon as the real work begins.
For q: = q\2 w h i l e abs(q) > eps d o x:= (if F > 0 t h e n q e l s e —q) + x end; Bisection(z$2 + (1 - (z + l)xln((z + l)lz)Xjr, Z, . ) For each cycle of the for statement the control will pass from Bisection to the expression in the call, from there to the ln-routine, then back to the call and finally back to Bisection. This means that the most important dynamic unit is composed of three pieces of program taken from widely separated places in the text. O n the basis of considerations of this kind and inspired by the scheme adopted for the Ferranti Atlas 8 we decided on the following scheme for the storage of the programs within G I E R A L G O L : 1.
Annual review in automatic programming. 4 by Richard Goodman