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w6c+selfhost: principled sub-word signedness (closes #5/#10)

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type_isunsigned recurses TY_ENUM and includes TY_RUNE on both stages.
13 LOAD + 6 STORE ladder sites (cstage) plus 4 more wwstage stragglers
in cgindex/cgforrange collapsed to fldloadop/fldstoreop helpers. N_CAST
narrow gate symmetrised; task #1's literal-kind workaround retired.
bool kept out of type_isunsigned, special-cased in field helpers.

Retroactively fixes a u32 mis-sign-extend in deref-compound (sz=4
hardcoded MOVSXD), pinned by new 660_field_signed row.
This commit is contained in:
Hojun-Cho
2026-05-13 22:23:00 +09:00
parent 461a448d5f
commit c4b3aca5e4
9 changed files with 976 additions and 535 deletions
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4
cmd/wcc/type.c
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@@ -170,8 +170,10 @@ type_isunsigned(Type *t)
switch (t->kind) {
case TY_U8: case TY_U16: case TY_U32: case TY_U64:
case TY_UINT: case TY_UINTPTR:
case TY_RUNE:
return 1;
case TY_NAMED: return type_isunsigned(t->under);
case TY_NAMED: return type_isunsigned(t->under);
case TY_ENUM: return type_isunsigned(t->sub);
default: return 0;
}
}