Strtod fast-case that uses DiyFps and cached powers of ten.

test/cctest/test-strtod.cc

Index: test/cctest/test-strtod.cc
===================================================================
--- test/cctest/test-strtod.cc	(revision 5685)
+++ test/cctest/test-strtod.cc	(working copy)
@@ -198,10 +198,58 @@
   CHECK_EQ(1234e304, StrtodChar("0000000123400000", 299));
   CHECK_EQ(V8_INFINITY, StrtodChar("00000000180000000", 300));
   CHECK_EQ(17e307, StrtodChar("00000000170000000", 300));
+  CHECK_EQ(1.7976931348623157E+308, StrtodChar("17976931348623157", 292));
+  CHECK_EQ(1.7976931348623158E+308, StrtodChar("17976931348623158", 292));
+  CHECK_EQ(V8_INFINITY, StrtodChar("17976931348623159", 292));
 
   // The following number is the result of 89255.0/1e-22. Both floating-point
   // numbers can be accurately represented with doubles. However on Linux,x86
   // the floating-point stack is set to 80bits and the double-rounding
   // introduces an error.
   CHECK_EQ(89255e-22, StrtodChar("89255", -22));
+  CHECK_EQ(104110013277974872254e-225,
+           StrtodChar("104110013277974872254", -225));
+
+  CHECK_EQ(123456789e108, StrtodChar("123456789", 108));
+  CHECK_EQ(123456789e109, StrtodChar("123456789", 109));
+  CHECK_EQ(123456789e110, StrtodChar("123456789", 110));
+  CHECK_EQ(123456789e111, StrtodChar("123456789", 111));
+  CHECK_EQ(123456789e112, StrtodChar("123456789", 112));
+  CHECK_EQ(123456789e113, StrtodChar("123456789", 113));
+  CHECK_EQ(123456789e114, StrtodChar("123456789", 114));
+  CHECK_EQ(123456789e115, StrtodChar("123456789", 115));
+
+  CHECK_EQ(1234567890123456789012345e108,
+           StrtodChar("1234567890123456789012345", 108));
+  CHECK_EQ(1234567890123456789012345e109,
+           StrtodChar("1234567890123456789012345", 109));
+  CHECK_EQ(1234567890123456789012345e110,
+           StrtodChar("1234567890123456789012345", 110));
+  CHECK_EQ(1234567890123456789012345e111,
+           StrtodChar("1234567890123456789012345", 111));
+  CHECK_EQ(1234567890123456789012345e112,
+           StrtodChar("1234567890123456789012345", 112));
+  CHECK_EQ(1234567890123456789012345e113,
+           StrtodChar("1234567890123456789012345", 113));
+  CHECK_EQ(1234567890123456789012345e114,
+           StrtodChar("1234567890123456789012345", 114));
+  CHECK_EQ(1234567890123456789012345e115,
+           StrtodChar("1234567890123456789012345", 115));
+
+  CHECK_EQ(1234567890123456789052345e108,
+           StrtodChar("1234567890123456789052345", 108));
+  CHECK_EQ(1234567890123456789052345e109,
+           StrtodChar("1234567890123456789052345", 109));
+  CHECK_EQ(1234567890123456789052345e110,
+           StrtodChar("1234567890123456789052345", 110));
+  CHECK_EQ(1234567890123456789052345e111,
+           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));
 }