mbs-octoml commented on a change in pull request #8423:
URL: https://github.com/apache/tvm/pull/8423#discussion_r688563079
##########
File path: src/target/target_kind.cc
##########
@@ -431,6 +431,9 @@ TVM_REGISTER_TARGET_KIND("hybrid", kDLCPU) // line break
TVM_REGISTER_TARGET_KIND("composite",
kDLCPU).add_attr_option<Array<Target>>("devices");
+TVM_REGISTER_TARGET_KIND("test", kDLCPU)
+ .set_attr<String>("relay_to_tir", "target.test.tir_lowering");
+
Review comment:
I think we're stuck with it this way so long as the units tests are
driven from the python side with a standard tvm lib.
##########
File path: src/relay/backend/te_compiler.cc
##########
@@ -185,16 +192,25 @@ class TECompilerImpl : public TECompilerNode {
}
cur_ccache_key_ = key;
- // No need to lower external functions for now. We will invoke the external
- // codegen tool once and lower all functions together.
if (key->source_func->GetAttr<String>(attr::kCompiler).defined()) {
auto ir_module = IRModule();
const auto name_node =
key->source_func->GetAttr<String>(tvm::attr::kGlobalSymbol);
ICHECK(name_node.defined()) << "External function has not been attached
a name yet.";
+
auto func_name = GetUniqueName(name_node.value(), &name_map_);
auto target = Target("ext_dev");
auto global_var = GlobalVar(func_name);
global_var->checked_type_ = key->source_func->checked_type();
+
+ auto code_gen_name =
key->source_func->GetAttr<String>(attr::kCompiler).value();
+ auto target_kind = tvm::TargetKind::Get(code_gen_name);
+ auto custom_lowering_to_tir =
+ target_kind ? target_kind.value().GetRegisteredHook("relay_to_tir")
: nullptr;
+ if (custom_lowering_to_tir != nullptr) {
+ target = key->target;
+ ir_module->Update((*custom_lowering_to_tir)(key->source_func,
key->target));
+ }
+
Review comment:
Between Andrew, Jared and myself we've been thinking the ideal world
would be something like:
- we can recover a Target from any prim call node. They get there using a
combination of registered target tags and targets, some way of annotating
targets for a lexical scope, and a transform to push the consequences of those
annotations down to every node.
- the relay_to_tir packed func would be an attribute on the TargetKind just
as you've done, but can be retrieved directly from the Target thanks to the
TargetKind-to-Target attribute copying (if I read that correctly).
- the BYOC compiler attribute is retired in favor of these Target
attributes.
So that's all well and good but is a refactor I'm loath to foist on you now.
So for right now:
- Can we make the relay_to_tir a TypedPackedFunc so the contract is clear?
And a comment in one place explaining what it is supposed to be.
- Try to bring the compiler-name-to-relay-to-tir lookup code into one
place, but continue with the TargetKind lookup as you've written it.
##########
File path: src/relay/backend/te_compiler.cc
##########
@@ -185,16 +192,25 @@ class TECompilerImpl : public TECompilerNode {
}
cur_ccache_key_ = key;
- // No need to lower external functions for now. We will invoke the external
- // codegen tool once and lower all functions together.
if (key->source_func->GetAttr<String>(attr::kCompiler).defined()) {
auto ir_module = IRModule();
const auto name_node =
key->source_func->GetAttr<String>(tvm::attr::kGlobalSymbol);
ICHECK(name_node.defined()) << "External function has not been attached
a name yet.";
+
auto func_name = GetUniqueName(name_node.value(), &name_map_);
auto target = Target("ext_dev");
auto global_var = GlobalVar(func_name);
global_var->checked_type_ = key->source_func->checked_type();
+
+ auto code_gen_name =
key->source_func->GetAttr<String>(attr::kCompiler).value();
+ auto target_kind = tvm::TargetKind::Get(code_gen_name);
+ auto custom_lowering_to_tir =
+ target_kind ? target_kind.value().GetRegisteredHook("relay_to_tir")
: nullptr;
+ if (custom_lowering_to_tir != nullptr) {
+ target = key->target;
+ ir_module->Update((*custom_lowering_to_tir)(key->source_func,
key->target));
+ }
+
Review comment:
lgtm, only nit is to make "relay_to_tir" a constexpr with a comment
explaining the intended signature. Unless I'm missing it currently that's
implied only by the call? thanks.
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