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Merged
lemire merged 4 commits into from
Jan 13, 2026
Merged

optimize uint16 parsing #359

lemire merged 4 commits into from
Jan 13, 2026
+227 −1

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@shikharish
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@shikharish shikharish commented Jan 1, 2026

  • Added a bench_uint16.cpp
  • Optimized uint16_t parsing with a similar approach to uint8_t.

benchmark results(Apple M1, Apple clang 14)
old:

parse_uint16_std_fromchars               :   0.46 GB/s   79.0 Mip/s  12.65 ns/ip   1.96 GHz  24.76 c/ip  111.74 i/ip   4.24 c/b  19.16 i/b   4.51 i/c 
parse_uint16_fastfloat                   :   0.75 GB/s  129.2 Mip/s   7.74 ns/ip   1.96 GHz  15.15 c/ip  90.51 i/ip   2.60 c/b  15.52 i/b   5.98 i/c

new:

parse_uint16_std_fromchars               :   0.46 GB/s   78.9 Mip/s  12.67 ns/ip   1.96 GHz  24.80 c/ip  111.74 i/ip   4.25 c/b  19.16 i/b   4.51 i/c 
parse_uint16_fastfloat                   :   1.10 GB/s  189.2 Mip/s   5.29 ns/ip   1.96 GHz  10.35 c/ip  54.33 i/ip   1.77 c/b   9.32 i/b   5.25 i/c

About 47% speedup on my machine

@shikharish
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shikharish commented Jan 1, 2026

cc: @lemire

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lemire commented Jan 1, 2026

Let me see if I can't get the s390x tests to work.

This would test BIG ENDIAN.

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lemire commented Jan 1, 2026

@shikharish Please sync with our main branch.

@shikharish
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shikharish commented Jan 1, 2026

@lemire done.

lemire
lemire approved these changes Jan 2, 2026
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Looks good. I will let it sit in case others have comments.

@shikharish
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shikharish commented Jan 13, 2026

@lemire can merge?

@lemire lemire merged commit fd9cad9 into fastfloat:main Jan 13, 2026
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lemire commented Jan 13, 2026

Will be in the next release.

IRainman added a commit to IRainman/fast_float that referenced this pull request Jan 13, 2026
@IRainman
Fixes for FASTFLOAT_IS_BIG_ENDIAN after PR fastfloat#359 is added to …
21d4ce1 
…original.
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@lemire lemire lemire approved these changes

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@shikharish @lemire