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Improve const hash

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This commit is contained in:
gingerBill
2020-11-29 16:03:21 +00:00
parent 1dfe0cdd1d
commit 7fbc081119
3 changed files with 68 additions and 17 deletions
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src/ir.cpp
+31 -6
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@@ -3615,6 +3615,29 @@ irValue *ir_gen_map_header(irProcedure *proc, irValue *map_val_ptr, Type *map_ty
return ir_emit_load(proc, h);
}
irValue *ir_const_hash(irModule *m, irValue *key, Type *key_type) {
irValue *hashed_key = nullptr;
if (key->kind == irValue_Constant) {
u64 hash = 0xcbf29ce484222325;
if (is_type_string(key_type)) {
GB_ASSERT(key->Constant.value.kind == ExactValue_String);
String s = key->Constant.value.value_string;
hash = fnv64a(s.text, s.len);
} else {
return nullptr;
}
// TODO(bill): other const hash types
if (build_context.word_size == 4) {
hash &= 0xffffffffull;
}
hashed_key = ir_const_uintptr(hash);
}
return hashed_key;
}
irValue *ir_gen_map_hash(irProcedure *proc, irValue *key, Type *key_type) {
Type *hash_type = t_u64;
irValue *v = ir_add_local_generated(proc, t_map_hash, true);
@@ -3624,12 +3647,14 @@ irValue *ir_gen_map_hash(irProcedure *proc, irValue *key, Type *key_type) {
irValue *key_ptr = ir_address_from_load_or_generate_local(proc, key);
key_ptr = ir_emit_conv(proc, key_ptr, t_rawptr);
irValue *hasher = ir_get_hasher_proc_for_type(proc->module, key_type);
auto args = array_make<irValue *>(permanent_allocator(), 2);
args[0] = key_ptr;
args[1] = ir_value_constant(t_uintptr, exact_value_i64(0));
irValue *hashed_key = ir_emit_call(proc, hasher, args);
irValue *hashed_key = ir_const_hash(proc->module, key, key_type);
if (hashed_key == nullptr) {
irValue *hasher = ir_get_hasher_proc_for_type(proc->module, key_type);
auto args = array_make<irValue *>(permanent_allocator(), 2);
args[0] = key_ptr;
args[1] = ir_value_constant(t_uintptr, exact_value_i64(0));
hashed_key = ir_emit_call(proc, hasher, args);
}
ir_emit_store(proc, ir_emit_struct_ep(proc, v, 0), hashed_key);
ir_emit_store(proc, ir_emit_struct_ep(proc, v, 1), key_ptr);