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cgen: key the tagged-widen struct copy on natural size, not slot size

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cgwidentaggedstorebp's struct-ident arms (local and module-global)
counted copy bytes from structinfo.totsize, the round-8 slot width, so
a struct whose natural size is not a multiple of 8 took the MOVQ word
loop and copied the source slot's dirty pad bytes over the zero-fill
the arm itself just established; the width-true tail emitter beneath
was dead code. cstage keys the same copy on su->size. Route both arms
through copysrcnatsize (the stamped-tinfo natural size, #71).
Graduates r71_tagged_return_scratch_mixed.
This commit is contained in:
Hojun-Cho
2026-08-07 23:51:07 +09:00
parent 4559b52950
commit c717facf78
2 changed files with 8 additions and 4 deletions
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Makefile
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@@ -583,8 +583,7 @@ DATABYTEID_EXPECTED_MIN = 911
# When a compiler fix lands the entry fails demanding graduation out of
# this list rather than silently widening coverage. Tracked with the #59
# divergence family.
DATABYTEID_DIVERGED = r71_tagged_return_scratch_mixed \
r76_typeeq_fn_diff_arity r76_typeeq_fn_diff_param_type \
DATABYTEID_DIVERGED = r76_typeeq_fn_diff_arity r76_typeeq_fn_diff_param_type \
r76_typeeq_fn_io_vtable_shape r76_typeeq_fn_variadic_vs_fixed \
r940_str_forrange_arg
$(if $(DATABYTEID_FILES),,$(error test-byteid: empty data corpus))