By Klaus Berkling (auth.), Lenore M. R. Mullin, Michael Jenkins, Gaétan Hains, Robert Bernecky, Guang Gao (eds.)
During a gathering in Toronto final wintry weather, Mike Jenkins, Bob Bernecky and that i have been discussing how the 2 latest theories on arrays encouraged or have been in fluenced through programming languages and structures. More's military thought was once the root for NIAL and APL2 and Mullin's A arithmetic of A rmys(MOA) , is getting used as an algebra of arrays in useful and A-calculus established seasoned gramming languages. MOA used to be prompted by way of Iverson's preliminary and prolonged algebra, the rules for APL and J respectively. We mentioned that there's a lot of curiosity within the desktop technological know-how and Engineering groups referring to formal equipment for languages that can aid vastly parallel operations in clinical computing, a again to-roots curiosity for either Mike and myself. Languages for this area can now not be informally built because it is important to map languages simply to many multiprocessor architectures. software program structures meant for parallel computation require a proper foundation in order that alterations might be performed with relative ease whereas making sure integrity in layout. record established lan guages are benefiting from theoretical foundations equivalent to the Bird-Meertens formalism. Their concept has been effectively used to explain record dependent parallel algorithms throughout many sessions of architectures.
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48 4 Performance Evaluation Perfonnance measurements were perfonned with two seismic applications that have been used for perfonnance measurements on other systems among which the Cray X-MP. The applications are Convolution (CONV) and Nonnal Moveout (NMO). Initially, the run-time system represented floating-point numbers in long (64 bit) fonnat. However, the floating-point coprocessors installed on the CMNS machine process only short (32 bit) fonnat. The machine will not use the floating point coprocessor if the length of a Boatingpoint word defined in an application differs from the wordlength of the coprocessor.
Both concepts define rectangular objects with attributes of rank and dimension. Valid values for the dimension are more restricted in the eM, but otherwise not different. Fields allocated in a geometry are the direct counterpart of APL arrays. The behaviour of the logical and arithmetic instructions of the eM is similar to the definition of the corresponding functions in APL. These functions, traditionally refered to as scalar functions, operate in parallel on all data elements of the argument arrays.
The code contains 19 branches, of which all but two could be replaced by case constructs, such as those discussed in 24 another paper [Be84]. The remaining two branches are used to loop over tokens and lines of source code. The latter could be replaced by a suitable invocation of the rank adverb, leaving only the finite state machine token loop. The tokenizer examines the entire source verb in parallel, generating a token table of the same shape as the source verb. The resulting token table and source verb are then used jointly by the remainder of the compiler.