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wcc/cgen: #135 inferred-float module-global — default untyped_float to f64 (wwstage)

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let pi = 3.5; pi * 2.0 (an inferred-type float module-global) was silently
miscompiled by wwstage: untyped_float wasn't defaulted, so letemitsize
sized it 0 -> no DATAW emitted -> the pi load was dropped, X0 kept a stale
spill -> 2.0*2.0 = 4 not 7. cstage became correct via #150-B's sym-repoint
(stamps f64 -> MOVSD), so this aligns wwstage UP, byte-identical.

wwstage-only: cgen.ww defaultinferredlets gains the untyped_float->f64 arm
(mirrors the untyped_int->int arm; the codebase's own #135-deferred
carve-out at cgen.ww:1079-1082, unblocked now that #150-B killed the
rule-10 divergence it feared), and cgenexpr.ww cgident gets a letfloatprim
fallback (the same primitive-TNAME SSoT letemitsize already uses, since a
renamed primitive TNAME carries no tinfo stamp). cstage cgen unchanged
(w6c md5 unchanged). int-inferred globals stay integer.

byte-id 990-997 8/8. test/wcc/824 table-driven. The N_CAST-no-recurse
parity (check.c:1276) is filed separately (#19).
This commit is contained in:
Hojun-Cho
2026-06-08 21:46:14 +09:00
parent ebd5b8014c
commit ef6fcbfc04
6 changed files with 398 additions and 6 deletions
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7
Makefile
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@@ -252,6 +252,7 @@ TESTS = $(BIN)/test_smoke $(BIN)/test_lex $(BIN)/test_parse $(BIN)/test_check \
$(BIN)/test_def_str_index_reject \
$(BIN)/test_struct_global_byval_arg \
$(BIN)/test_inferred_global_let \
$(BIN)/test_inferred_float_global \
$(BIN)/test_slice_str_global_zero \
$(BIN)/test_slice_literal_global \
$(BIN)/test_global_arr_elem_field \
@@ -672,6 +673,12 @@ $(BIN)/test_inferred_global_let: test/wcc/823_inferred_global_let.c $(BIN)/ww \
$(LIB)/libwwrt.a | $(BIN)
$(CC) $(CFLAGS) -o $@ $<
$(BIN)/test_inferred_float_global: test/wcc/824_inferred_float_global.c $(BIN)/ww \
$(BIN)/w6c $(BIN)/w6a $(BIN)/w6l \
$(BIN)/ww_ww $(BIN)/w6c_ww $(BIN)/w6a_ww $(BIN)/w6l_ww \
$(LIB)/libwwrt.a | $(BIN)
$(CC) $(CFLAGS) -o $@ $<
$(BIN)/test_def_arr_infer_len: test/wcc/814_def_arr_infer_len.c $(BIN)/ww \
$(BIN)/w6c $(BIN)/w6a $(BIN)/w6l \
$(BIN)/ww_ww $(BIN)/w6c_ww $(BIN)/w6a_ww $(BIN)/w6l_ww \