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impl and tests for big recursive tag unions

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Folkert 2023-06-01 19:45:11 +02:00
parent f5578e71b6
commit e7791443e6
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2 changed files with 195 additions and 48 deletions
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164
crates/compiler/gen_dev/src/generic64/mod.rs
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@ -1562,7 +1562,7 @@ impl<
let dst_reg = self.storage_manager.load_to_general_reg(&mut self.buf, dst);
ASM::eq_reg_reg_reg(&mut self.buf, width, dst_reg, dst_reg, tmp_reg);
self.free_symbol(&tmp);
self.free_symbol(tmp);
}
_ => {
let ident_ids = self
@ -1640,7 +1640,22 @@ impl<
self.free_symbol(tmp)
}
x => todo!("NumNeq: layout, {:?}", x),
_ => {
// defer to equality
self.build_eq(dst, src1, src2, arg_layout);
let dst_reg = self.storage_manager.load_to_general_reg(&mut self.buf, dst);
self.storage_manager
.with_tmp_general_reg(&mut self.buf, |_, buf, tmp| {
ASM::mov_reg64_imm64(buf, tmp, -1);
ASM::xor_reg64_reg64_reg64(buf, dst_reg, tmp, dst_reg);
ASM::mov_reg64_imm64(buf, tmp, 1);
ASM::and_reg64_reg64_reg64(buf, dst_reg, tmp, dst_reg);
})
}
}
}
@ -2754,40 +2769,38 @@ impl<
);
}
UnionLayout::Recursive(tag_layouts) => {
if union_layout.stores_tag_id_as_data(self.storage_manager.target_info) {
todo!("big recursive tags")
} else {
let other_fields = tag_layouts[tag_id as usize];
let element_layout = other_fields[index as usize];
let other_fields = tag_layouts[tag_id as usize];
let element_layout = other_fields[index as usize];
let ptr_reg = self
.storage_manager
.load_to_general_reg(&mut self.buf, structure);
let ptr_reg = self
.storage_manager
.load_to_general_reg(&mut self.buf, structure);
// mask out the tag id bits
if !union_layout.stores_tag_id_as_data(self.storage_manager.target_info) {
let mask_symbol = self.debug_symbol("tag_id_mask");
let mask_reg = self
.storage_manager
.claim_general_reg(&mut self.buf, &mask_symbol);
ASM::mov_reg64_imm64(&mut self.buf, mask_reg, (!0b111) as _);
// mask out the tag id bits
ASM::and_reg64_reg64_reg64(&mut self.buf, ptr_reg, ptr_reg, mask_reg);
let mut offset = 0;
for field in &other_fields[..index as usize] {
offset += self.layout_interner.stack_size(*field);
}
Self::ptr_read(
&mut self.buf,
&mut self.storage_manager,
self.layout_interner,
ptr_reg,
offset as i32,
element_layout,
*sym,
);
}
let mut offset = 0;
for field in &other_fields[..index as usize] {
offset += self.layout_interner.stack_size(*field);
}
Self::ptr_read(
&mut self.buf,
&mut self.storage_manager,
self.layout_interner,
ptr_reg,
offset as i32,
element_layout,
*sym,
);
}
}
}
@ -3002,11 +3015,30 @@ impl<
}
UnionLayout::Recursive(_) => {
if union_layout.stores_tag_id_as_data(self.storage_manager.target_info) {
todo!("big recursive tags")
} else {
let dst_reg = self.storage_manager.claim_general_reg(&mut self.buf, sym);
let dst_reg = self.storage_manager.claim_general_reg(&mut self.buf, sym);
let target_info = self.storage_manager.target_info;
if union_layout.stores_tag_id_as_data(target_info) {
let offset = union_layout
.tag_id_offset(self.interner(), target_info)
.unwrap() as i32;
let ptr_reg = self
.storage_manager
.load_to_general_reg(&mut self.buf, structure);
match union_layout.tag_id_layout() {
Layout::U8 => {
ASM::mov_reg8_mem8_offset32(&mut self.buf, dst_reg, ptr_reg, offset);
ASM::movzx_reg_reg(&mut self.buf, RegisterWidth::W8, dst_reg, dst_reg)
}
Layout::U16 => {
ASM::mov_reg16_mem16_offset32(&mut self.buf, dst_reg, ptr_reg, offset);
ASM::movzx_reg_reg(&mut self.buf, RegisterWidth::W16, dst_reg, dst_reg)
}
_ => unreachable!(),
}
} else {
// mask the 3 lowest bits
let tmp = Symbol::DEV_TMP5;
let reg = self.storage_manager.claim_general_reg(&mut self.buf, &tmp);
@ -3189,33 +3221,73 @@ impl<
}
}
UnionLayout::Recursive(tags) => {
if union_layout.stores_tag_id_as_data(self.storage_manager.target_info) {
todo!("big recursive tags")
self.load_literal_symbols(fields);
let whole_struct_symbol = self.debug_symbol("whole_struct_symbol");
let tag_id_symbol = self.debug_symbol("tag_id_symbol");
let other_fields = tags[tag_id as usize];
let stores_tag_id_as_data =
union_layout.stores_tag_id_as_data(self.storage_manager.target_info);
// construct the payload as a struct on the stack
let data_struct_layout = self
.layout_interner
.insert_no_semantic(LayoutRepr::Struct(other_fields));
let tag_id_layout = union_layout.tag_id_layout();
if stores_tag_id_as_data {
let inner_struct_symbol = self.debug_symbol("inner_struct_symbol");
self.storage_manager.create_struct(
self.layout_interner,
&mut self.buf,
&inner_struct_symbol,
&data_struct_layout,
fields,
);
self.load_literal_i64(&tag_id_symbol, tag_id as _);
let arena = self.env.arena;
let whole_struct_layout = self.layout_interner.insert_no_semantic(
LayoutRepr::Struct(arena.alloc([data_struct_layout, tag_id_layout])),
);
self.storage_manager.create_struct(
self.layout_interner,
&mut self.buf,
&whole_struct_symbol,
&whole_struct_layout,
arena.alloc([inner_struct_symbol, tag_id_symbol]),
);
self.expr_box(*sym, whole_struct_symbol, whole_struct_layout, reuse);
self.free_symbol(&tag_id_symbol);
self.free_symbol(&whole_struct_symbol);
self.free_symbol(&inner_struct_symbol);
} else {
let other_fields = tags[tag_id as usize];
// construct the payload as a struct on the stack
let temp_sym = Symbol::DEV_TMP5;
let layout = self
.layout_interner
.insert_no_semantic(LayoutRepr::Struct(other_fields));
self.load_literal_symbols(fields);
self.storage_manager.create_struct(
self.layout_interner,
&mut self.buf,
&temp_sym,
&layout,
&whole_struct_symbol,
&data_struct_layout,
fields,
);
// now effectively box this struct
let untagged_pointer_symbol = self.debug_symbol("untagged_pointer");
self.expr_box(untagged_pointer_symbol, temp_sym, layout, reuse);
self.expr_box(
untagged_pointer_symbol,
whole_struct_symbol,
data_struct_layout,
reuse,
);
self.free_symbol(&temp_sym);
let tag_id_symbol = self.debug_symbol("tag_id");
self.free_symbol(&whole_struct_symbol);
// finally, we need to tag the pointer
debug_assert!(tag_id < 8);