diff --git a/include/Support/MathExtras.h b/include/Support/MathExtras.h
index d5209854877..c1384d3eff5 100644
--- a/include/Support/MathExtras.h
+++ b/include/Support/MathExtras.h
@@ -29,6 +29,13 @@ inline unsigned log2(uint64_t C) {
   return getPow;
 }
 
+inline unsigned log2(unsigned C) {
+  unsigned getPow;
+  for (getPow = 0; C > 1; ++getPow)
+    C >>= 1;
+  return getPow;
+}
+
 inline bool isPowerOf2(int64_t C, unsigned &getPow) {
   if (C < 0) C = -C;
   if (C > 0 && C == (C & ~(C - 1))) {
diff --git a/include/llvm/Support/MathExtras.h b/include/llvm/Support/MathExtras.h
index d5209854877..c1384d3eff5 100644
--- a/include/llvm/Support/MathExtras.h
+++ b/include/llvm/Support/MathExtras.h
@@ -29,6 +29,13 @@ inline unsigned log2(uint64_t C) {
   return getPow;
 }
 
+inline unsigned log2(unsigned C) {
+  unsigned getPow;
+  for (getPow = 0; C > 1; ++getPow)
+    C >>= 1;
+  return getPow;
+}
+
 inline bool isPowerOf2(int64_t C, unsigned &getPow) {
   if (C < 0) C = -C;
   if (C > 0 && C == (C & ~(C - 1))) {