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

test/cctest/test-strtod.cc

Index: test/cctest/test-strtod.cc
diff --git a/test/cctest/test-strtod.cc b/test/cctest/test-strtod.cc
index ae1c00d36e13910f39766417de961bf50d09e7fa..d8da168f2c628ac074e0dcbaaae14cbdcba8bb93 100644
--- a/test/cctest/test-strtod.cc
+++ b/test/cctest/test-strtod.cc
@@ -204,4 +204,49 @@ TEST(Strtod) {
   // 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));
 }