Hojun-Cho
81796cd533
lib/strconv: stof.ha port — Eisel-Lemire string→float (#106 fold-4)
stof64/stof32 (f64|f32 | invalid | overflow) via Eisel-Lemire fast-path
(powers_of_ten[596][2]u64 + eisel_lemire 128-bit multiply) + decimal
slow-path fallback (decimal.ww, fold-3). 16 fns + faithful powers_of_ten
(byte-identical to Hare). u128 via pure-u64 64×64→128 (ftos_ryu.ha).
Consumes &math.f64info (γ-cleanup), tagged-float-return (PREREQ-2 #157),
2D double-index (PREREQ-1 #156).
13 documented spelling-divergences (rule-9, each cites stof.ha): #155
(po10 double-index + per-field struct-copy), #161 (compound-assign explicit
form), #144 (-0.0 via 1u64<<63), #158, #138, test-only #143/parsef64.
Test 909 (DEC+hex+NaN/Inf/invalid/overflow, bit-exact, cstage ww run).
Make test 185/185 incl 990-997 byte-id + combined_ww_fresh. Makefile:
stof.ww added to w6c_ww/wwdump_ww deps (freshness, fold-3 precedent).
Drew's strconv 5-fold plan 4/5. Followup #162 (wwstage lexer parsef64
1-ULP — could adopt stof64).
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