Added an option to configure MaxDevirtIterations (#3)

* Added an option to configure MaxDevirtIterations

* fixup! Added an option to configure MaxDevirtIterations

(cherry picked from commit 74a4177)

Author: homuroll

llvm/include/llvm-c/Transforms/PassBuilder.h

@@ -102,6 +102,9 @@ void LLVMPassBuilderOptionsSetMergeFunctions(LLVMPassBuilderOptionsRef Options,
 void LLVMPassBuilderOptionsSetInlinerThreshold(
     LLVMPassBuilderOptionsRef Options, int Threshold);
 
+void LLVMPassBuilderOptionsSetMaxDevirtIterations(
+    LLVMPassBuilderOptionsRef Options, int Iterations);
+
 /**
  * Dispose of a heap-allocated PassBuilderOptions instance
  */

llvm/include/llvm/Passes/PassBuilder.h

@@ -85,6 +85,9 @@ class PipelineTuningOptions {
   // analyses after various module->function or cgscc->function adaptors in the
   // default pipelines.
   bool EagerlyInvalidateAnalyses;
+
+  /// Tuning option to override default devirtualization iterations.
+  int MaxDevirtIterations;
 };
 
 /// This class provides access to building LLVM's passes.

llvm/lib/Passes/PassBuilderBindings.cpp

@@ -144,6 +144,11 @@ void LLVMPassBuilderOptionsSetInlinerThreshold(
   unwrap(Options)->PTO.InlinerThreshold = Threshold;
 }
 
+void LLVMPassBuilderOptionsSetMaxDevirtIterations(
+    LLVMPassBuilderOptionsRef Options, int Iterations) {
+  unwrap(Options)->PTO.MaxDevirtIterations = Iterations;
+}
+
 void LLVMDisposePassBuilderOptions(LLVMPassBuilderOptionsRef Options) {
   delete unwrap(Options);
 }

llvm/lib/Passes/PassBuilderPipelines.cpp

@@ -290,6 +290,7 @@ PipelineTuningOptions::PipelineTuningOptions() {
   CallGraphProfile = true;
   MergeFunctions = EnableMergeFunctions;
   InlinerThreshold = -1;
+  MaxDevirtIterations = -1;
   EagerlyInvalidateAnalyses = EnableEagerlyInvalidateAnalyses;
 }
 
@@ -810,9 +811,10 @@ PassBuilder::buildInlinerPipeline(OptimizationLevel Level,
   if (PGOOpt)
     IP.EnableDeferral = EnablePGOInlineDeferral;
 
+  int MDI = PTO.MaxDevirtIterations == -1 ? MaxDevirtIterations : PTO.MaxDevirtIterations;
   ModuleInlinerWrapperPass MIWP(IP, PerformMandatoryInliningsFirst,
                                 InlineContext{Phase, InlinePass::CGSCCInliner},
-                                UseInlineAdvisor, MaxDevirtIterations);
+                                UseInlineAdvisor, MDI);
 
   // Require the GlobalsAA analysis for the module so we can query it within
   // the CGSCC pipeline.