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lib/strconv: stof.ha port — Eisel-Lemire string→float (#106 fold-4)

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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).
This commit is contained in:
Hojun-Cho
2026-05-27 13:55:56 +09:00
parent 4a91bdc8db
commit 81796cd533
8 changed files with 6977 additions and 606 deletions
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10
Makefile
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@@ -113,7 +113,7 @@ $(BIN)/wwdump_ww: selfhost/cmd/wwdump/main.ww \
selfhost/cmd/wcc/cgen.ww selfhost/cmd/wcc/cgenexpr.ww \
selfhost/cmd/wcc/cgenstmt.ww selfhost/cmd/wcc/cgenutil.ww \
selfhost/cmd/wcc/cgendecl.ww \
lib/os/os.ww lib/rt/malloc.ww lib/time/time.ww lib/strconv/strconv.ww lib/strconv/stof_data.ww lib/strconv/decimal.ww lib/strings/strings.ww lib/bytes/bytes.ww lib/encoding/utf8/utf8.ww lib/ascii/ascii.ww lib/io/io.ww lib/memio/memio.ww lib/fmt/fmt.ww \
lib/os/os.ww lib/rt/malloc.ww lib/time/time.ww lib/strconv/strconv.ww lib/strconv/stof_data.ww lib/strconv/decimal.ww lib/strconv/stof.ww lib/strings/strings.ww lib/bytes/bytes.ww lib/encoding/utf8/utf8.ww lib/ascii/ascii.ww lib/io/io.ww lib/memio/memio.ww lib/fmt/fmt.ww \
$(BIN)/ww $(BIN)/w6c $(BIN)/w6a $(BIN)/w6l \
$(LIB)/libwwrt.a | $(BIN)
@mkdir -p $(BIN)/wwdump_ww.d
@@ -135,7 +135,7 @@ $(BIN)/w6c_ww: selfhost/cmd/w6c/main.ww \
selfhost/cmd/wcc/cgen.ww selfhost/cmd/wcc/cgenexpr.ww \
selfhost/cmd/wcc/cgenstmt.ww selfhost/cmd/wcc/cgenutil.ww \
selfhost/cmd/wcc/cgendecl.ww \
lib/os/os.ww lib/rt/malloc.ww lib/time/time.ww lib/strconv/strconv.ww lib/strconv/stof_data.ww lib/strconv/decimal.ww lib/strings/strings.ww lib/bytes/bytes.ww lib/encoding/utf8/utf8.ww lib/ascii/ascii.ww lib/io/io.ww lib/memio/memio.ww lib/fmt/fmt.ww \
lib/os/os.ww lib/rt/malloc.ww lib/time/time.ww lib/strconv/strconv.ww lib/strconv/stof_data.ww lib/strconv/decimal.ww lib/strconv/stof.ww lib/strings/strings.ww lib/bytes/bytes.ww lib/encoding/utf8/utf8.ww lib/ascii/ascii.ww lib/io/io.ww lib/memio/memio.ww lib/fmt/fmt.ww \
$(BIN)/ww $(BIN)/w6c $(BIN)/w6a $(BIN)/w6l \
$(LIB)/libwwrt.a | $(BIN)
@mkdir -p $(BIN)/w6c_ww.d
@@ -322,7 +322,7 @@ TESTS = $(BIN)/test_smoke $(BIN)/test_lex $(BIN)/test_parse $(BIN)/test_check \
$(BIN)/test_intdiv_signed \
$(BIN)/test_strings_run \
$(BIN)/test_hex_run $(BIN)/test_utf8_run $(BIN)/test_bytes_run \
$(BIN)/test_decimal_run \
$(BIN)/test_decimal_run $(BIN)/test_stof_run \
$(BIN)/test_memio_run $(BIN)/test_temp_run $(BIN)/test_getopt_run \
$(BIN)/test_base32_run $(BIN)/test_base64_run \
$(BIN)/test_adler32_run $(BIN)/test_crc16_run \
@@ -1046,6 +1046,10 @@ $(BIN)/test_decimal_run: test/wcc/922_decimal_run.c $(BIN)/ww $(BIN)/w6c \
$(BIN)/w6a $(BIN)/w6l $(LIB)/libwwrt.a | $(BIN)
$(CC) $(CFLAGS) -o $@ $<
$(BIN)/test_stof_run: test/wcc/909_stof_run.c $(BIN)/ww $(BIN)/w6c \
$(BIN)/w6a $(BIN)/w6l $(LIB)/libwwrt.a | $(BIN)
$(CC) $(CFLAGS) -o $@ $<
$(BIN)/test_strings_run: test/wcc/966_strings_run.c $(BIN)/ww $(BIN)/w6c \
$(BIN)/w6a $(BIN)/w6l $(LIB)/libwwrt.a | $(BIN)
$(CC) $(CFLAGS) -o $@ $<