troubleshoot 32bit failures

Author: jbrockmendel

pandas/core/arrays/datetimes.py

@@ -1753,7 +1753,7 @@ def _generate_range_overflow_safe(endpoint, periods, stride,
     # GH#14187 raise instead of incorrectly wrapping around
     assert side in ['start', 'end']
 
-    i64max = np.iinfo(np.int64).max
+    i64max = np.uint64(np.iinfo(np.int64).max)
     msg = ('Cannot generate range with {side}={endpoint} and '
            'periods={periods}'
            .format(side=side, endpoint=Timestamp(endpoint), periods=periods))
@@ -1793,7 +1793,7 @@ def _generate_range_overflow_safe_signed(endpoint, periods, stride, side):
         addend = np.int64(periods) * np.int64(stride)
         try:
             # easy case with no overflows
-            return np.int64(endpoint) + addend
+            return np.int64(endpoint) + np.int64(addend)
         except (FloatingPointError, OverflowError):
             # with endpoint negative and addend positive we risk
             #  FloatingPointError; with reversed signed we risk OverflowError
@@ -1810,10 +1810,10 @@ def _generate_range_overflow_safe_signed(endpoint, periods, stride, side):
                     return result
             else:
                 return _generate_range_recurse(endpoint, periods,
-                                               np.abs(stride), side)
+                                               np.int64(np.abs(stride)), side)
         elif stride < 0 and endpoint > 0:
             return _generate_range_recurse(np.uint64(endpoint), periods,
-                                           np.abs(stride), side)
+                                           np.int64(np.abs(stride)), side)
 
     try:
         other_end = checked_add_with_arr(np.int64(endpoint),