parser.c: Use SWAR to skip consecutive spaces#886
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Closes: ruby#881 If we encounter a newline, it is likely that the document is pretty printed, hence that the newline is followed by multiple spaces. In such case we can use SWAR to count up to eight consecutive spaces at once. ``` == Parsing activitypub.json (58160 bytes) ruby 3.4.6 (2025-09-16 revision dbd83256b1) +YJIT +PRISM [arm64-darwin24] Warming up -------------------------------------- after 1.118k i/100ms Calculating ------------------------------------- after 11.223k (± 0.7%) i/s (89.10 μs/i) - 57.018k in 5.080522s Comparison: before: 10834.4 i/s after: 11223.4 i/s - 1.04x faster == Parsing twitter.json (567916 bytes) ruby 3.4.6 (2025-09-16 revision dbd83256b1) +YJIT +PRISM [arm64-darwin24] Warming up -------------------------------------- after 118.000 i/100ms Calculating ------------------------------------- after 1.188k (± 1.0%) i/s (841.62 μs/i) - 6.018k in 5.065355s Comparison: before: 1094.8 i/s after: 1188.2 i/s - 1.09x faster == Parsing citm_catalog.json (1727030 bytes) ruby 3.4.6 (2025-09-16 revision dbd83256b1) +YJIT +PRISM [arm64-darwin24] Warming up -------------------------------------- after 58.000 i/100ms Calculating ------------------------------------- after 570.506 (± 3.7%) i/s (1.75 ms/i) - 2.900k in 5.091529s Comparison: before: 419.6 i/s after: 570.5 i/s - 1.36x faster == Parsing float parsing (2251051 bytes) ruby 3.4.6 (2025-09-16 revision dbd83256b1) +YJIT +PRISM [arm64-darwin24] Warming up -------------------------------------- after 22.000 i/100ms Calculating ------------------------------------- after 212.010 (± 1.9%) i/s (4.72 ms/i) - 1.078k in 5.086885s Comparison: before: 189.4 i/s after: 212.0 i/s - 1.12x faster ``` Co-Authored-By: Scott Myron <samyron@gmail.com>
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Closes: #881
If we encounter a newline, it is likely that the document is pretty printed, hence that the newline is followed by multiple spaces.
In such case we can use SWAR to count up to eight consecutive spaces at once.
FYI: @samyron