[clang] [Clang] Disable verifier passes by default in NewPM CodeGen (PR #208178)

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llvmorg-github-actions[bot] wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang-codegen

Author: Alexis Engelke (aengelke)

<details>
<summary>Changes</summary>

By default, we shouldn't add expensive verifier passes to the pipeline.
This causes a substantial perf regression compared to the legacy PM.


---
Full diff: https://github.com/llvm/llvm-project/pull/208178.diff


1 Files Affected:

- (modified) clang/lib/CodeGen/BackendUtil.cpp (+1) 


``````````diff
diff --git a/clang/lib/CodeGen/BackendUtil.cpp b/clang/lib/CodeGen/BackendUtil.cpp
index e33480f6c6416..f33026426e815 100644
--- a/clang/lib/CodeGen/BackendUtil.cpp
+++ b/clang/lib/CodeGen/BackendUtil.cpp
@@ -1301,6 +1301,7 @@ void EmitAssemblyHelper::RunCodegenPipelineNewPM(
   CGSCCAnalysisManager CGAM;
   ModuleAnalysisManager MAM;
   CGPassBuilderOption Opt = getCGPassBuilderOption();
+  Opt.DisableVerify = !CodeGenOpts.VerifyModule;
   MachineModuleInfo MMI(TM.get());
   PassInstrumentationCallbacks PIC;
   PipelineTuningOptions PTOptions;

``````````

</details>


https://github.com/llvm/llvm-project/pull/208178