diff --git a/lib/CodeGen/LiveIntervalAnalysis.cpp b/lib/CodeGen/LiveIntervalAnalysis.cpp
index aa0597f..99d94c3 100644
--- a/lib/CodeGen/LiveIntervalAnalysis.cpp
+++ b/lib/CodeGen/LiveIntervalAnalysis.cpp
@@ -1634,7 +1634,7 @@
   // overflow a float. This expression behaves like 10^d for small d, but is
   // more tempered for large d. At d=200 we get 6.7e33 which leaves a bit of
   // headroom before overflow.
-  float lc = powf(1 + (100.0f / (loopDepth+10)), (float)loopDepth);
+  float lc = std::pow(1 + (100.0f / (loopDepth+10)), (float)loopDepth);
 
   return (isDef + isUse) * lc;
 }
diff --git a/lib/CodeGen/RegAllocLinearScan.cpp b/lib/CodeGen/RegAllocLinearScan.cpp
index 6c8fc0c..bc331f0 100644
--- a/lib/CodeGen/RegAllocLinearScan.cpp
+++ b/lib/CodeGen/RegAllocLinearScan.cpp
@@ -809,7 +809,7 @@
     MachineInstr *MI = &*I;
     if (cur->liveAt(li_->getInstructionIndex(MI))) {
       unsigned loopDepth = loopInfo->getLoopDepth(MI->getParent());
-      Conflicts += powf(10.0f, (float)loopDepth);
+      Conflicts += std::pow(10.0f, (float)loopDepth);
     }
   }
   return Conflicts;
diff --git a/lib/CodeGen/RegAllocPBQP.cpp b/lib/CodeGen/RegAllocPBQP.cpp
index 81cfd8f..4fafd28 100644
--- a/lib/CodeGen/RegAllocPBQP.cpp
+++ b/lib/CodeGen/RegAllocPBQP.cpp
@@ -489,7 +489,7 @@
       // did, but none of their definitions would prevent us from coalescing.
       // We're good to go with the coalesce.
 
-      float cBenefit = powf(10.0f, loopInfo->getLoopDepth(mbb)) / 5.0;
+      float cBenefit = std::pow(10.0f, (float)loopInfo->getLoopDepth(mbb)) / 5.0;
 
       coalescesFound[RegPair(srcReg, dstReg)] = cBenefit;
       coalescesFound[RegPair(dstReg, srcReg)] = cBenefit;