Hojun-Cho c814856550 wwstage: C-FFI variadic call codegen parity with cstage (#10) ...

Mirror cstage's C-variadic call handling in the ww self-host: parse a
bare `...` param (decl.ww), skip param-keyed desugar for it to avoid a
nil-deref (check.ww), and emit AL = XMM-reg count plus CVTSS2SD
promotion of f32 args in the variadic tail (cgenutil.ww, cgenexpr.ww).
Closes the cat-A wwstage silent miscompile (AL=0, unpromoted f32 tail).

Parse/check/cgen are one atomic align-up (parse alone miscompiles, so
not bisect-splittable). 989_ffivariadic now runs dual-stage (cstage ww
+ wwstage ww_ww), 12/12; w6c==w6c_ww byte-identical. Byte-id alone is
blind here (the bootstrap calls no float-bearing C variadic), so the
ww_ww runtime rows are the real net.

2026-06-21 11:50:18 +09:00

7.6 KiB

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