diff --git a/include/llvm/MC/MCAsmInfo.h b/include/llvm/MC/MCAsmInfo.h
index 6c141a1..f57f642 100644
--- a/include/llvm/MC/MCAsmInfo.h
+++ b/include/llvm/MC/MCAsmInfo.h
@@ -97,7 +97,11 @@
     /// AllowNameToStartWithDigit - This is true if the assembler allows symbol
     /// names to start with a digit (e.g., "0x0021").  This defaults to false.
     bool AllowNameToStartWithDigit;
-    
+
+    /// AllowPeriodsInName - This is true if the assembler allows periods in
+    /// symbol names.  This defaults to true.
+    bool AllowPeriodsInName;
+
     //===--- Data Emission Directives -------------------------------------===//
 
     /// ZeroDirective - this should be set to the directive used to get some
@@ -341,6 +345,9 @@
     bool doesAllowNameToStartWithDigit() const {
       return AllowNameToStartWithDigit;
     }
+    bool doesAllowPeriodsInName() const {
+      return AllowPeriodsInName;
+    }
     const char *getZeroDirective() const {
       return ZeroDirective;
     }
diff --git a/lib/MC/MCAsmInfo.cpp b/lib/MC/MCAsmInfo.cpp
index f0da694..2b23994 100644
--- a/lib/MC/MCAsmInfo.cpp
+++ b/lib/MC/MCAsmInfo.cpp
@@ -35,6 +35,7 @@
   AssemblerDialect = 0;
   AllowQuotesInName = false;
   AllowNameToStartWithDigit = false;
+  AllowPeriodsInName = true;
   ZeroDirective = "\t.zero\t";
   AsciiDirective = "\t.ascii\t";
   AscizDirective = "\t.asciz\t";
diff --git a/lib/Target/Mangler.cpp b/lib/Target/Mangler.cpp
index 1d5c511..4ef017a 100644
--- a/lib/Target/Mangler.cpp
+++ b/lib/Target/Mangler.cpp
@@ -22,11 +22,12 @@
 #include "llvm/ADT/Twine.h"
 using namespace llvm;
 
-static bool isAcceptableChar(char C) {
+static bool isAcceptableChar(char C, bool AllowPeriod) {
   if ((C < 'a' || C > 'z') &&
       (C < 'A' || C > 'Z') &&
       (C < '0' || C > '9') &&
-      C != '_' && C != '$' && C != '.' && C != '@')
+      C != '_' && C != '$' && C != '@' &&
+      !(AllowPeriod && C == '.'))
     return false;
   return true;
 }
@@ -54,8 +55,9 @@
   
   // If any of the characters in the string is an unacceptable character, force
   // quotes.
+  bool AllowPeriod = MAI.doesAllowPeriodsInName();
   for (unsigned i = 0, e = Str.size(); i != e; ++i)
-    if (!isAcceptableChar(Str[i]))
+    if (!isAcceptableChar(Str[i], AllowPeriod))
       return true;
   return false;
 }
@@ -70,9 +72,10 @@
     MangleLetter(OutName, Str[0]);
     Str = Str.substr(1);
   }
-  
+
+  bool AllowPeriod = MAI.doesAllowPeriodsInName();
   for (unsigned i = 0, e = Str.size(); i != e; ++i) {
-    if (!isAcceptableChar(Str[i]))
+    if (!isAcceptableChar(Str[i], AllowPeriod))
       MangleLetter(OutName, Str[i]);
     else
       OutName.push_back(Str[i]);