masahi commented on a change in pull request #9223:
URL: https://github.com/apache/tvm/pull/9223#discussion_r731347240
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File path: src/target/llvm/codegen_llvm.cc
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@@ -343,7 +345,26 @@ void CodeGenLLVM::Optimize() {
// place optimization pass
llvm::PassManagerBuilder builder;
- builder.OptLevel = 3;
+
+ // Use the same opt-level as specified in TargetMachine for running passes
+ llvm::CodeGenOpt::Level opt_level = target_machine_->getOptLevel();
+
+ switch (opt_level) {
+ case llvm::CodeGenOpt::Level::None:
+ builder.OptLevel = 0;
+ break;
+ case llvm::CodeGenOpt::Level::Less:
+ builder.OptLevel = 1;
+ break;
+
+ case llvm::CodeGenOpt::Level::Default:
+ builder.OptLevel = 2;
+ break;
+
+ default:
+ // CodeGenOpt::Level::Aggressive
+ builder.OptLevel = 3;
Review comment:
I think we just inherited opt level being 3 by default from Halide:
https://github.com/halide/Halide/blob/ed87acb466f13144be235a33a30f242e30a6a74f/src/CodeGen_LLVM.cpp#L1145
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