[PATCH] Remove log2 dependency when building against Android API-9 SDK

[Vince Harron]

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D9884

Files:
  llvm/trunk/include/llvm/Support/MathExtras.h

Index: llvm/trunk/include/llvm/Support/MathExtras.h
===================================================================
--- llvm/trunk/include/llvm/Support/MathExtras.h
+++ llvm/trunk/include/llvm/Support/MathExtras.h
@@ -456,7 +456,7 @@
 /// Log2 - This function returns the log base 2 of the specified value
 inline double Log2(double Value) {
 #if defined(__ANDROID_API__) && __ANDROID_API__ < 18
-  return (double)__builtin_log2l(Value);
+  return __builtin_log(Value) / __builtin_log(2.0);
 #else
   return log2(Value);
 #endif

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