ios fixes

src/core/SkFloatBits.cpp

Index: src/core/SkFloatBits.cpp
diff --git a/src/core/SkFloatBits.cpp b/src/core/SkFloatBits.cpp
index 39b51abf1dc8a9939c41e69463ee50a37b9b1956..b0690e520970d85ac273ec202c0c54470a10dfab 100644
--- a/src/core/SkFloatBits.cpp
+++ b/src/core/SkFloatBits.cpp
@@ -85,7 +85,14 @@ int32_t SkFloatBits_toIntFloor(int32_t packed) {
         value = SkApplySign(value, SkExtractSign(packed));
         exp = -exp;
         if (exp > 25) {   // underflow
+#ifdef SK_FAST_UNDERFLOW_BEHAVIOR
+        // The iOS ARM processor discards small denormalized numbers to go faster.
+        // The comparision below empirically causes the result to agree with the
+        // tests in MathTest test_float_floor
+            if (exp > 149) return 0;

[reed1, 2014/07/10 21:40:05]

nit: {} and indentation

if (exp > 149) {
    return 0;
}

[caryclark, 2014/07/11 12:57:19]

Done.

+#else
             exp = 25;
+#endif
         }
         // int add = 0;
         return value >> exp;
@@ -145,7 +152,15 @@ int32_t SkFloatBits_toIntCeil(int32_t packed) {
         value = SkApplySign(value, SkExtractSign(packed));
         exp = -exp;
         if (exp > 25) {   // underflow
+#ifdef SK_FAST_UNDERFLOW_BEHAVIOR
+        // The iOS ARM processor discards small denormalized numbers to go faster.
+        // The comparision below empirically causes the result to agree with the
+        // tests in MathTest test_float_ceil
+            if (exp > 149) return 0;
+            return 0 < value;
+#else
             exp = 25;
+#endif
         }
         int add = (1 << exp) - 1;
         return (value + add) >> exp;