{'fraction_non_alphanumeric': 0.017901234567901235, 'fraction_numerical': 0.0006172839506172839, 'mean_word_length': 5.698347107438017, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Scalable Register Renaming via the Quack Register File

To improve the performance of superscalar microprocessors, developers are continually deepening pipelines, increasing the instruction window size, and widening instruction dispatch. As these microarchitecture features grow they stress the register renaming mechanism by increasing the demands for physical registers, and register read/write bandwidth. There are four major components to register renaming that suffer scaling problems: physical tag assignment (destination allocation), source operand read, result writeback, and result commit. This work introduces a new scalable register renaming scheme, built around the novel Quack register file. The Quack register file has a simple implementation that yields a read latency independent of the physical register count. It also facilitates a mapping strategy that does not require a separate mapping table, or similar structure. The latency and performance of the Quack register file are analyzed and compared to current register renaming implementations using the Cache Access and Cycle Time Information (CACTI) tool and a full functional performance simulation model. Results: The Quack register file provides a high-performance low-latency single cycle register renaming implementation that scales extremely well for ultra-large superscalar designs. The delays for all register renaming functions are independent of the rename register count and less dependent on the port count than current methods. It is demonstrated that the performance potential for the Quack register file is 6x that of current methods.