[PATCH] D92897: Set legacy pass manager OptBisect to same as NPM OptBisect

[Samuel Eubanks via Phabricator via cfe-commits]

swamulism created this revision.
swamulism added a reviewer: aeubanks.
swamulism requested review of this revision.
Herald added projects: clang, LLVM.
Herald added subscribers: llvm-commits, cfe-commits.

Currently there is an issue where the legacy pass manager uses a different OptBisect counter than the new pass manager.
This means that when using OptBisect under the NPM it runs twice when it should only run once.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D92897

Files:
  clang/lib/CodeGen/BackendUtil.cpp
  clang/test/CodeGen/new-pass-manager-O1-opt-bisect.c
  llvm/include/llvm/Passes/StandardInstrumentations.h


Index: llvm/include/llvm/Passes/StandardInstrumentations.h
===================================================================
--- llvm/include/llvm/Passes/StandardInstrumentations.h
+++ llvm/include/llvm/Passes/StandardInstrumentations.h
@@ -281,6 +281,7 @@
   void registerCallbacks(PassInstrumentationCallbacks &PIC);
 
   TimePassesHandler &getTimePasses() { return TimePasses; }
+  OptBisectInstrumentation &getOptBisect() { return OptBisect; }
 };
 
 extern template class ChangeReporter<std::string>;
Index: clang/test/CodeGen/new-pass-manager-O1-opt-bisect.c
===================================================================
--- /dev/null
+++ clang/test/CodeGen/new-pass-manager-O1-opt-bisect.c
@@ -0,0 +1,8 @@
+// Test NPM with -O1/opt-bisect
+//
+// RUN: %clang_cc1 -triple x86_64-linux-gnu -O1 -fexperimental-new-pass-manager %s -fdebug-pass-manager -mllvm -opt-bisect-limit=-1 -emit-llvm -o /dev/null 2>&1 | FileCheck %s
+
+// CHECK: BISECT: running pass (1)
+// CHECK-NOT: BISECT: running pass (1)
+
+int func(int a) { return a; }
Index: clang/lib/CodeGen/BackendUtil.cpp
===================================================================
--- clang/lib/CodeGen/BackendUtil.cpp
+++ clang/lib/CodeGen/BackendUtil.cpp
@@ -1149,6 +1149,9 @@
   SI.registerCallbacks(PIC);
   PassBuilder PB(CodeGenOpts.DebugPassManager, TM.get(), PTO, PGOOpt, &PIC);
 
+  // Sets legacy pass manager OptBisect to the same one as npm so passes are properly skipped
+  TheModule->getContext().setOptPassGate(SI.getOptBisect());
+
   // Attempt to load pass plugins and register their callbacks with PB.
   for (auto &PluginFN : CodeGenOpts.PassPlugins) {
     auto PassPlugin = PassPlugin::Load(PluginFN);


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