2463eea1d4
90/90 regression tests pass (+ffi-03-large-struct).
vendors/ffi_large_struct/{.h,.c} defines:
Big24 — 24 B, three s64 (byval params + sret return)
Big48 — 48 B, six s64 (same path, larger)
`make / rotate-or-reverse / sum` helpers per shape. The sx-side
example imports via `#source` only and declares matching structs +
hand-written #foreign decls.
Snapshot pins today's >16-byte aggregate ABI now that the
emit_llvm.zig sret-return transform is in place (previous commit).
That gives us a regression net for all four C-ABI aggregate slots
in one place:
≤8 B int — i64 coercion (ffi-01 vec-likes)
9..16 B int — [2 x i64] coercion (ffi-02 Pair64/Quad32, 101)
16 B HFA — struct, no coercion (ffi-02 Vec2/Vec4f)
>16 B — byval params + sret (this commit)
23 lines
1.0 KiB
C
23 lines
1.0 KiB
C
// FFI large-struct (>16 B) by-value roundtrips. These route through
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// the byval-pointer ABI path (caller copies onto its stack, hands the
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// callee a pointer; on AAPCS64 a separate `x8` indirect-return
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// register; on SysV AMD64 a hidden first arg). Distinct from the
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// register-pair / [2 x i64] / HFA paths the small-struct baseline
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// covers — locking those in here keeps the byval path honest.
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//
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// Big24 — 24 B, three s64
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// Big48 — 48 B, six s64
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typedef struct { long long a; long long b; long long c; } Big24;
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typedef struct { long long a; long long b; long long c;
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long long d; long long e; long long f; } Big48;
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Big24 ffi_big24_make (long long a, long long b, long long c);
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Big24 ffi_big24_rotate(Big24 v);
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long long ffi_big24_sum (Big24 v);
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Big48 ffi_big48_make (long long a, long long b, long long c,
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long long d, long long e, long long f);
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Big48 ffi_big48_reverse(Big48 v);
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long long ffi_big48_sum (Big48 v);
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