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mem zero rather than store to a union where the variant is of size zero

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gingerBill
2023-11-24 10:57:18 +00:00
parent f809788f75
commit 3102abf1aa
3 changed files with 14 additions and 3 deletions
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src/llvm_backend_general.cpp
+9 -3
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@@ -1332,6 +1332,8 @@ gb_internal void lb_emit_store_union_variant(lbProcedure *p, lbValue parent, lbV
Type *pt = base_type(type_deref(parent.type));
GB_ASSERT(pt->kind == Type_Union);
if (pt->Union.kind == UnionType_shared_nil) {
GB_ASSERT(type_size_of(variant_type));
lbBlock *if_nil = lb_create_block(p, "shared_nil.if_nil");
lbBlock *if_not_nil = lb_create_block(p, "shared_nil.if_not_nil");
lbBlock *done = lb_create_block(p, "shared_nil.done");
@@ -1353,9 +1355,13 @@ gb_internal void lb_emit_store_union_variant(lbProcedure *p, lbValue parent, lbV
} else {
lbValue underlying = lb_emit_conv(p, parent, alloc_type_pointer(variant_type));
lb_emit_store(p, underlying, variant);
if (type_size_of(variant_type) == 0) {
unsigned alignment = 1;
lb_mem_zero_ptr_internal(p, parent.value, pt->Union.variant_block_size, alignment, false);
} else {
lbValue underlying = lb_emit_conv(p, parent, alloc_type_pointer(variant_type));
lb_emit_store(p, underlying, variant);
}
lb_emit_store_union_variant_tag(p, parent, variant_type);
}
}