Push version 2.5.7 to trunk....

test/cctest/test-strtod.cc

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 
 #include <stdlib.h>
 
 #include "v8.h"
 
 #include "bignum.h"
 #include "cctest.h"
 #include "diy-fp.h"
 #include "double.h"
@@ skipping 241 matching lines @@
            StrtodChar("1234567890123456789052345", 111));
   CHECK_EQ(1234567890123456789052345e112,
            StrtodChar("1234567890123456789052345", 112));
   CHECK_EQ(1234567890123456789052345e113,
            StrtodChar("1234567890123456789052345", 113));
   CHECK_EQ(1234567890123456789052345e114,
            StrtodChar("1234567890123456789052345", 114));
   CHECK_EQ(1234567890123456789052345e115,
            StrtodChar("1234567890123456789052345", 115));
 
+  CHECK_EQ(5.445618932859895e-255,
+           StrtodChar("5445618932859895362967233318697132813618813095743952975"
+                      "4392982234069699615600475529427176366709107287468930197"
+                      "8628345413991790019316974825934906752493984055268219809"
+                      "5012176093045431437495773903922425632551857520884625114"
+                      "6241265881735209066709685420744388526014389929047617597"
+                      "0302268848374508109029268898695825171158085457567481507"
+                      "4162979705098246243690189880319928315307816832576838178"
+                      "2563074014542859888710209237525873301724479666744537857"
+                      "9026553346649664045621387124193095870305991178772256504"
+                      "4368663670643970181259143319016472430928902201239474588"
+                      "1392338901353291306607057623202353588698746085415097902"
+                      "6640064319118728664842287477491068264828851624402189317"
+                      "2769161449825765517353755844373640588822904791244190695"
+                      "2998382932630754670573838138825217065450843010498555058"
+                      "88186560731", -1035));
+
   // Boundary cases. Boundaries themselves should round to even.
   //
   // 0x1FFFFFFFFFFFF * 2^3 = 72057594037927928
   //                   next: 72057594037927936
   //               boundary: 72057594037927932  should round up.
   CHECK_EQ(72057594037927928.0, StrtodChar("72057594037927928", 0));
   CHECK_EQ(72057594037927936.0, StrtodChar("72057594037927936", 0));
   CHECK_EQ(72057594037927936.0, StrtodChar("72057594037927932", 0));
   CHECK_EQ(72057594037927928.0, StrtodChar("7205759403792793199999", -5));
   CHECK_EQ(72057594037927936.0, StrtodChar("7205759403792793200001", -5));
@@ skipping 136 matching lines @@
         buffer[pos++] = random() % 10 + '0';
       }
       int exponent = DeterministicRandom() % (308*2 + 1) - 308 - length;
       buffer[pos] = '\0';
       Vector<const char> vector(buffer, pos);
       double strtod_result = Strtod(vector, exponent);
       CHECK(CheckDouble(vector, exponent, strtod_result));
     }
   }
 }