[PATCH] D13088: [InlineCost] Adjust inlining cost for implicit null checks

[Chen Li via llvm-commits]

chenli created this revision.
chenli added reviewers: reames, chandlerc.
chenli added a subscriber: llvm-commits.

Implicit null checks act like unconditional branches, and their inlining cost should be free.

http://reviews.llvm.org/D13088

Files:
  lib/Analysis/InlineCost.cpp

Index: lib/Analysis/InlineCost.cpp
===================================================================
--- lib/Analysis/InlineCost.cpp
+++ lib/Analysis/InlineCost.cpp
@@ -602,6 +602,11 @@
     disableSROA(CostIt);
   }
 
+  // Implicit null checks act as unconditional branches, and
+  // they should be free. See the comments in visitBranchInst.
+  if (I.getMetadata(LLVMContext::MD_make_implicit))
+    return true;
+
   return false;
 }
 


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