Daniel Lemire f1ea4556f9 Split default path into verbatim separator-free scanner ... PR #369 gated the digit-separator/prefix feature on a compile-time has_separator flag and claimed the has_separator==false instantiation "compiles to exactly the same code as if the feature did not exist". Instruction-count measurement (benchmark i/f, deterministic +/- 0.0%) disproved this: routing the default path through the shared, restructured body cost GCC 14 ~1.5-2.3 i/f on short doubles, a reproducible regression on mesh/double (+0.77 i/f ASCII, +1.35 UTF-16) even as canada improved. Fix: the has_separator==false instantiation now delegates to parse_number_string_nosep, a verbatim copy of the original separator-free scanner, so the default path's codegen is byte-for-byte the pre-feature parser. The shared parse_number_string body becomes separator-only (the dead !has_separator branches are removed). The inaccurate doc comment is corrected. Measured vs pre-feature baseline (34164f5), instructions per float: canada/f64 ASCII 242.32 -> 238.87 (PR: 240.87) canada/f64 UTF16 251.05 -> 241.81 (PR: 245.79) mesh/f64 ASCII 107.69 -> 107.57 (PR: 108.46, +0.77 regression) mesh/f64 UTF16 110.10 -> 109.74 (PR: 111.45, +1.35 regression) All eight fastfloat rows now match or beat both the baseline and the PR; the mesh/double regression is eliminated. All 14 ctest suites pass.		2026-07-13 11:10:05 -04:00
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fast_float	Split default path into verbatim separator-free scanner	2026-07-13 11:10:05 -04:00