<p dir="ltr">Won't this still force a rehash since the table will be more that 3/4 full?  Assuming the initialization list contains unique keys.</p>
<div class="gmail_quote">On Mar 25, 2016 10:11 AM, "David Blaikie via llvm-commits" <<a href="mailto:llvm-commits@lists.llvm.org">llvm-commits@lists.llvm.org</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><p dir="ltr">Worth a test?</p>
<div class="gmail_quote">On Mar 24, 2016 11:02 PM, "Mehdi Amini via llvm-commits" <<a href="mailto:llvm-commits@lists.llvm.org" target="_blank">llvm-commits@lists.llvm.org</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Author: mehdi_amini<br>
Date: Fri Mar 25 00:57:47 2016<br>
New Revision: 264383<br>
<br>
URL: <a href="http://llvm.org/viewvc/llvm-project?rev=264383&view=rev" rel="noreferrer" target="_blank">http://llvm.org/viewvc/llvm-project?rev=264383&view=rev</a><br>
Log:<br>
StringMap: reserve appropriate size when initializing from an initializer list<br>
<br>
From: Mehdi Amini <<a href="mailto:mehdi.amini@apple.com" target="_blank">mehdi.amini@apple.com</a>><br>
<br>
Modified:<br>
    llvm/trunk/include/llvm/ADT/StringMap.h<br>
<br>
Modified: llvm/trunk/include/llvm/ADT/StringMap.h<br>
URL: <a href="http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/ADT/StringMap.h?rev=264383&r1=264382&r2=264383&view=diff" rel="noreferrer" target="_blank">http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/ADT/StringMap.h?rev=264383&r1=264382&r2=264383&view=diff</a><br>
==============================================================================<br>
--- llvm/trunk/include/llvm/ADT/StringMap.h (original)<br>
+++ llvm/trunk/include/llvm/ADT/StringMap.h Fri Mar 25 00:57:47 2016<br>
@@ -233,7 +233,7 @@ public:<br>
       Allocator(A) {}<br>
<br>
   StringMap(std::initializer_list<std::pair<StringRef, ValueTy>> List)<br>
-      : StringMapImpl(static_cast<unsigned>(sizeof(MapEntryTy))) {<br>
+      : StringMapImpl(List.size(), static_cast<unsigned>(sizeof(MapEntryTy))) {<br>
     for (const auto &P : List) {<br>
       insert(P);<br>
     }<br>
<br>
<br>
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</blockquote></div>
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<br></blockquote></div>