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(badly) implement OpTypeForwardPointer deduplication

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This commit is contained in:
khyperia 2020-09-22 18:25:48 +02:00
parent 206af9d2a1
commit d4c4834fd6
1 changed files with 20 additions and 0 deletions
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20
rspirv-linker/src/lib.rs
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@ -185,8 +185,21 @@ fn remove_duplicate_types(module: &mut rspirv::dr::Module) {
// This means that any instruction that declares the same type, but with different result_id, will result in the
// same key.
let mut key_to_result_id = HashMap::new();
// TODO: This is implementing forward pointers incorrectly.
let mut unresolved_forward_pointers = HashSet::new();
for inst in &mut module.types_global_values {
if inst.class.opcode == spirv::Op::TypeForwardPointer {
if let rspirv::dr::Operand::IdRef(id) = inst.operands[0] {
unresolved_forward_pointers.insert(id);
continue;
}
}
if inst.class.opcode == spirv::Op::TypeForwardPointer
&& unresolved_forward_pointers.contains(&inst.result_id.unwrap())
{
unresolved_forward_pointers.remove(&inst.result_id.unwrap());
}
// This is an important spot: Say that we come upon a duplicated aggregate type (one that references
// other types). Its arguments may be duplicated themselves, and so building the key directly will fail
// to match up with the first type. However, **because forward references are not allowed**, we're
@ -208,6 +221,13 @@ fn remove_duplicate_types(module: &mut rspirv::dr::Module) {
data.push(id);
}
for op in &mut inst.operands {
if let rspirv::dr::Operand::IdRef(ref mut id) = op {
if unresolved_forward_pointers.contains(id) {
// TODO: This is implementing forward pointers incorrectly. All unresolved forward pointers will
// compare equal.
*id = 0;
}
}
op.assemble_into(&mut data);
}