By Henry Levy, Richard Eckhouse
Takes a distinct platforms method of programming and structure of the VAX
utilizing the VAX as a close instance, the 1st 1/2 this ebook deals a whole direction in meeting language programming. the second one describes higher-level platforms concerns in laptop structure. Highlights contain the VAX assembler and debugger, different glossy architectures corresponding to RISCs, multiprocessing and parallel computing, microprogramming, caches and translation buffers, and an appendix at the Berkeley UNIX assembler.
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Extra info for Computer Programming and Architecture. The VAX
In this case, the program would probably need to know explicitly how long the string is. Note that the string is surrounded by a delimiter that is not part of the string (in this case, \). Any character can be used to delimit the start and the end of a string, as long as it is not part of the string itself. There are three other storage methods and corresponding directives for strings. A counted ASCII string is a string in which the first byte contains the length of the string. Since the count is limited to a byte, the string can be no longer than 255 characters.
Since each register is 32 bits, a register typically holds a single longword. However, two adjacent registers can hold a quadword and four adjacent registers can. hold an octaword. In this case, the entire information unit is named by the lower numbered of the adjacent registers. That is, if a quadword is stored in register 2 (R2) and register 3 (R3), we specify the unit by R2. Another information unit found in the VAX is the variable-length bit field. The bit field is different in that the basic addressable unit is based on a length measured not in bytes but in bits.
Note that we have arbitrarily allocated two sign bits to allow positive and negative fractions and exponents. It is more common to assign only one sign bit to a word. Thus, a different representation is used in which the most significant bit of the word is the sign of the fraction and the exponent is represented as a positive (biased) value. In other words, although the exponent is a positive number in the range 0 through m - 1 , half of the exponent range (0 to m/2—l) is used to represent negative numbers while the other half (m/2 to m— 1) represents positive numbers.