[GISel][NFC]: Add methods to speed up insertion into GISelWorklist

https://reviews.llvm.org/D58073

Speed up insertion during the initial populating phase into the
GISelWorkList by deferring repeatedly resizing the DenseMap.
This results in ~10% improvement in the combiner passes, and
~3% speedup in the Legalizer.

reviewed by: aemerson.

llvm-svn: 354093

1 files changed, 4 insertions, 2 deletions

diff --git a/llvm/lib/CodeGen/GlobalISel/Legalizer.cpp b/llvm/lib/CodeGen/GlobalISel/Legalizer.cpp
index 02fa4d12038..bd486d7dd1f 100644
--- a/llvm/lib/CodeGen/GlobalISel/Legalizer.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/Legalizer.cpp
@@ -155,11 +155,13 @@ bool Legalizer::runOnMachineFunction(MachineFunction &MF) {
       if (!isPreISelGenericOpcode(MI.getOpcode()))
         continue;
       if (isArtifact(MI))
-        ArtifactList.insert(&MI);
+        ArtifactList.deferred_insert(&MI);
       else
-        InstList.insert(&MI);
+        InstList.deferred_insert(&MI);
     }
   }
+  ArtifactList.finalize();
+  InstList.finalize();
   std::unique_ptr<MachineIRBuilder> MIRBuilder;
   GISelCSEInfo *CSEInfo = nullptr;
   bool EnableCSE = EnableCSEInLegalizer.getNumOccurrences()