Axis Control in SAC

Abstract. High-level array processing is characterized by the composi-tion of generic operations, which treat all array elements in a uniform way. This paper proposes a mechanism that allows programmers to direct effects of such array operations to non-scalar subarrays of argument ar-rays without sacrificing the high-level programming approach. A versatile notation for axis control is presented, and it is shown how the additional language constructs can be transformed into regular SaC code. Further-more, an optimization technique is introduced which achieves the same runtime performance regardless of whether code is written using the new notation or in a substantially less elegant style employing conventional language features.