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0e66073e32
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lib/strconv: f64tos Ryū shortest float→string (#106 fold-5a)
Graduate f64tos from the lossy fixed-point placeholder to Ryū shortest-
round-trippable (ftos.ha:432 + ftos_ryu.ha). f64tos(n:f64) str, G-format
(void/NONE) — the faithful documented subset (full parametric fftosf is
dead code for G/void/NONE → deferred #64). Ryū core decomposed: struct-
RETURN + scalar params (Hare's r128 idiom; avoids tuple-ABI #163-166).
f64 powers tables [15][2]/[13][2]u64 (2D #156). Zero float literals.
Both E+F encode paths reachable+tested, no dead code.
Graduation (lib-note "don't keep both"): old lossy f64tos deleted; fmt
fprintf_f64_huge "huge"→"9.5e18" (improvement). 5 value-faithful filed-
bug dodges (byte-id, documented): #167/#169/#170/#43/#144. Test 908.
Make test 186/186 incl 990-997 byte-id + combined_ww_fresh.
Drew's strconv 5-fold plan — primary completion (f64tos). f32tos coda
#67 (behind #143); parametric ftosf #64.
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2026-05-27 15:39:03 +09:00 |
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81796cd533
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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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2026-05-27 13:55:56 +09:00 |
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07e57ff9a6
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lib/strconv: decimal arbitrary-precision arithmetic (#106 fold-3)
Port ref/hare/strconv/decimal.ha (~202 LOC Hare) → 314 LOC
lib/strconv/decimal.ww — decimal struct + 11 fns (trim,
decimal_shift, leftshift, leftshift_newdigits, rightshift, round,
decimal_round, helpers). 1:1 mechanical Hare-fidelity with 8
documented spelling-divergences. Shared engine for stof (fold-4) +
ftos (fold-5). Built atop 5 wwstage cgen prereqs
(#131/#133-expanded/#134/#135/#138) that closed gate-blind silent
miscompiles surfaced by the port. Test 922_decimal_run +
lib/strconv/test/decimaltest.ww (6 @test fns covering all 11 impl
fns).
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2026-05-27 00:44:16 +09:00 |
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