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Optimization for the Intel® Itanium® architecture register stack

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4 Author(s)
Settle, A. ; Dept. of Electr. & Comput. Eng., Colorado Univ., Boulder, CO, USA ; Connors, D.A. ; Hoflehner, G. ; Lavery, D.

The Intel® Itanium® architecture contains a number of innovative compiler-controllable features designed to exploit instruction level parallelism. New code generation and optimization techniques are critical to the application of these features to improve processor performance. For instance, the Itanium® architecture provides a compiler-controllable virtual register stack to reduce the penalty of memory accesses associated with procedure calls. The Itanium® Register Stack Engine (RSE) transparently manages the register stack and saves and restores physical registers to and from memory as needed. Existing code generation techniques for the register stack aggressively allocate virtual registers without regard to the register pressure on different control-flow paths. As such, applications with large data sets may stress the RSE, and cause substantial execution delays due to the high number of register saves and restores. Since the Itanium® architecture is developed around Explicitly Parallel Instruction Computing (EPIC) concepts, solutions to increasing the register stack efficiency favor code generation techniques rather than hardware approaches.

Published in:

Code Generation and Optimization, 2003. CGO 2003. International Symposium on

Date of Conference:

23-26 March 2003

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