From: Jakob Stoklund Olesen <stoklund@2pi.dk>
Date: Mon, 11 Apr 2011 20:01:44 +0000 (+0000)
Subject: Skip a binary search when possible.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=3d32202748f3ce3de31e48a183130d94e767e97c;p=oota-llvm.git

Skip a binary search when possible.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129293 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/include/llvm/CodeGen/SlotIndexes.h b/include/llvm/CodeGen/SlotIndexes.h
index dc247132c8f..7bbb7521e54 100644
--- a/include/llvm/CodeGen/SlotIndexes.h
+++ b/include/llvm/CodeGen/SlotIndexes.h
@@ -545,6 +545,8 @@ namespace llvm {
 
     /// Returns the basic block which the given index falls in.
     MachineBasicBlock* getMBBFromIndex(SlotIndex index) const {
+      if (MachineInstr *MI = getInstructionFromIndex(index))
+        return MI->getParent();
       SmallVectorImpl<IdxMBBPair>::const_iterator I =
         std::lower_bound(idx2MBBMap.begin(), idx2MBBMap.end(), index);
       // Take the pair containing the index