[PATCH] D18617: Call TargetMachine::addEarlyAsPossiblePasses from BackendUtil.

[Justin Lebar via cfe-commits]

jlebar created this revision.
jlebar added a reviewer: chandlerc.
jlebar added subscribers: tra, cfe-commits, rnk.

As of D18614, TargetMachine exposes a hook to add a set of passes that should
be run as early as possible.  Invoke this hook from clang when setting up the
pass manager.

http://reviews.llvm.org/D18617

Files:
  lib/CodeGen/BackendUtil.cpp

Index: lib/CodeGen/BackendUtil.cpp
===================================================================
--- lib/CodeGen/BackendUtil.cpp
+++ lib/CodeGen/BackendUtil.cpp
@@ -340,6 +340,14 @@
     return;
   }
 
+  // Add target-specific passes that need to run as early as possible.
+  if (TM)
+    PMBuilder.addExtension(
+        PassManagerBuilder::EP_EarlyAsPossible,
+        [this](const PassManagerBuilder &, legacy::PassManagerBase &PM) {
+          TM->addEarlyAsPossiblePasses(PM);
+        });
+
   PMBuilder.addExtension(PassManagerBuilder::EP_EarlyAsPossible,
                          addAddDiscriminatorsPass);
 


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