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i386: return a complex of eight bytes or fewer in EAX:EDX, not through a hidden pointer

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abi test: cover bare f16, complex, rawptr, enum and bit_set
This commit is contained in:
kalsprite
2026-08-14 21:09:26 -07:00
parent 1b57f6e092
commit 0fb1721e45
2 changed files with 26 additions and 2 deletions
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12
src/llvm_abi.cpp
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@@ -499,6 +499,18 @@ namespace lbAbi386 {
}
}
// A complex lowers to a struct of two floats. The struct rule sends every struct through
// a hidden pointer. The psABI gives complex its own rule: one of eight bytes or fewer
// comes back in EAX:EDX, and only the wider ones go through memory. `complex64` is
// returned coerced to `i64` and `complex128` keeps the hidden pointer.
if (return_is_defined && !return_is_tuple &&
return_source != nullptr && is_type_complex(return_source)) {
i64 sz = lb_sizeof(return_type);
if (sz > 0 && sz <= 8) {
ft->ret = lb_arg_type_direct(return_type, LLVMIntTypeInContext(c, cast(unsigned)(sz*8)), nullptr, nullptr);
}
}
ft->calling_convention = calling_convention;
return ft;
}