AndrewZhaoLuo commented on a change in pull request #9223:
URL: https://github.com/apache/tvm/pull/9223#discussion_r731310152
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File path: src/target/llvm/llvm_common.cc
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@@ -139,8 +152,22 @@ std::unique_ptr<llvm::TargetMachine>
GetLLVMTargetMachine(const Target& target,
ICHECK(allow_null) << err << " target_triple=" << target_triple;
return nullptr;
}
- llvm::TargetMachine* tm =
- llvm_target->createTargetMachine(target_triple, mcpu, mattr, opt,
llvm::Reloc::PIC_);
+
+ Integer llvm_opt_level = target->GetAttr<Integer>("O").value_or(Integer(2));
Review comment:
Hmm so the link listed is for the PassManager. Higher opt level = more
passes much like we have relay opt level. It appears to be associated with -O3
in clang. However, CodeGenOpts appears to be a separate thing that is set in
clang too
https://github.com/llvm/llvm-project/blob/main/clang/lib/CodeGen/BackendUtil.cpp#L935.
Looks like this emits the assembly. This is also associated with clang's -O3.
So the flag should control everything.
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