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- Remove default initializers from hot-path types (parsed_number, adjusted_mantissa, u128, stackvec) to eliminate mandatory zeroing on intent(out) per Fortran standard - Remove dead try_fast_path call that always returned valid=false for PRESET_GENERAL (FMT_SKIP_WS flag set) - Inline is_space check in whitespace skip loop - Compute JSON flag inline, eliminating local variable - Add explicit safety initializations for frac_start, frac_len, and too_many_digits on paths that skipped them - Add parse_double_batch subroutine for batch parsing API
- Pre-compute integer offset arrays (istart/iend) to avoid c_size_t conversion overhead in the hot benchmark loop - Add batch C benchmark function (benchmark_ffc_lines) to eliminate per-line Fortran-to-C call overhead - Enable FMT_SKIP_WS in C ffc benchmark to match Fortran's PRESET_GENERAL for fair comparison - Add ffc_parse_double_ws with whitespace-skip options - Update Fortran bridge to use whitespace-skip C entry point
Replace fpm-based benchmark build with manual compilation using Profile-Guided Optimization (PGO). This bypasses fpm's forced -fPIC flag and enables proper PGO profile matching across build phases. Build process: instrument → collect profile on uniform + file data → rebuild with -fprofile-use. Combined with LTO and aggressive inlining flags, this achieves ~30% speedup over the fpm release build.
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