ios fixes

src/core/SkPoint.cpp

Index: src/core/SkPoint.cpp
diff --git a/src/core/SkPoint.cpp b/src/core/SkPoint.cpp
index 719ee54b225ae72e57ee6752ab22a107178adc66..8a6d0564af59b96d3e9842c02af373866b11bf02 100644
--- a/src/core/SkPoint.cpp
+++ b/src/core/SkPoint.cpp
@@ -7,6 +7,7 @@
  */
 
 
+#include "SkMathPriv.h"
 #include "SkPoint.h"
 
 void SkIPoint::rotateCW(SkIPoint* dst) const {
@@ -168,7 +169,17 @@ bool SkPoint::setLength(float x, float y, float length) {
         // divide by inf. and return (0,0) vector.
         double xx = x;
         double yy = y;
+    #ifdef SK_DISCARD_DENORMALIZED_FOR_SPEED
+        // The iOS ARM processor discards small denormalized numbers to go faster.
+        // Casting this to a float would cause the scale to go to zero. Keeping it
+        // as a double for the multiply keeps the scale non-zero.
+        double dscale = length / sqrt(xx * xx + yy * yy);
+        fX = x * dscale;
+        fY = y * dscale;
+        return true;
+    #else
         scale = (float)(length / sqrt(xx * xx + yy * yy));
+    #endif
     }
     fX = x * scale;
     fY = y * scale;