Micro-optimize rstring_cache_fetch#891
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Only apply these definitions on 64 bits archs, as it's unclear if they have performance benefits or compatibility issues on 32bit archs.
Closes: ruby#888 - Mark it as `inline`. - Use `RSTRING_GETMEM`, instead of `RSTRING_LEN` and `RSTRING_PTR`. - Use an inlinable version of `memcmp`. ``` == Parsing activitypub.json (58160 bytes) ruby 3.4.6 (2025-09-16 revision dbd83256b1) +YJIT +PRISM [arm64-darwin24] Comparison: before: 11766.6 i/s after: 12272.1 i/s - 1.04x faster == Parsing twitter.json (567916 bytes) ruby 3.4.6 (2025-09-16 revision dbd83256b1) +YJIT +PRISM [arm64-darwin24] Comparison: before: 1333.2 i/s after: 1422.0 i/s - 1.07x faster == Parsing citm_catalog.json (1727030 bytes) ruby 3.4.6 (2025-09-16 revision dbd83256b1) +YJIT +PRISM [arm64-darwin24] Comparison: before: 656.3 i/s after: 673.1 i/s - 1.03x faster == Parsing float parsing (2251051 bytes) ruby 3.4.6 (2025-09-16 revision dbd83256b1) +YJIT +PRISM [arm64-darwin24] Comparison: before: 276.8 i/s after: 276.4 i/s - same-ish: difference falls within error ``` Co-Authored-By: Scott Myron <samyron@gmail.com>
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rstring_cache_fetch
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Closes: #888
inline.RSTRING_GETMEM, instead ofRSTRING_LENandRSTRING_PTR.memcmp.