Revert grisu commits.

test/cctest/test-diy_fp.cc

-// Copyright 2006-2008 the V8 project authors. All rights reserved.
-
-#include <stdlib.h>
-
-#include "v8.h"
-
-#include "platform.h"
-#include "cctest.h"
-#include "diy_fp.h"
-
-using namespace v8::internal;
-
-
-TEST(Subtract) {
-  DiyFp diy_fp1 = DiyFp(3, 0);
-  DiyFp diy_fp2 = DiyFp(1, 0);
-  DiyFp diff = DiyFp::Minus(diy_fp1, diy_fp2);
-
-  CHECK(2 == diff.f());
-  CHECK_EQ(0, diff.e());
-  diy_fp1.Subtract(diy_fp2);
-  CHECK(2 == diy_fp1.f());
-  CHECK_EQ(0, diy_fp1.e());
-}
-
-
-TEST(Multiply) {
-  DiyFp diy_fp1 = DiyFp(3, 0);
-  DiyFp diy_fp2 = DiyFp(2, 0);
-  DiyFp product = DiyFp::Times(diy_fp1, diy_fp2);
-
-  CHECK(0 == product.f());
-  CHECK_EQ(64, product.e());
-  diy_fp1.Multiply(diy_fp2);
-  CHECK(0 == diy_fp1.f());
-  CHECK_EQ(64, diy_fp1.e());
-
-  diy_fp1 = DiyFp(V8_2PART_UINT64_C(0x80000000, 00000000), 11);
-  diy_fp2 = DiyFp(2, 13);
-  product = DiyFp::Times(diy_fp1, diy_fp2);
-  CHECK(1 == product.f());
-  CHECK_EQ(11 + 13 + 64, product.e());
-
-  // Test rounding.
-  diy_fp1 = DiyFp(V8_2PART_UINT64_C(0x80000000, 00000001), 11);
-  diy_fp2 = DiyFp(1, 13);
-  product = DiyFp::Times(diy_fp1, diy_fp2);
-  CHECK(1 == product.f());
-  CHECK_EQ(11 + 13 + 64, product.e());
-
-  diy_fp1 = DiyFp(V8_2PART_UINT64_C(0x7fffffff, ffffffff), 11);
-  diy_fp2 = DiyFp(1, 13);
-  product = DiyFp::Times(diy_fp1, diy_fp2);
-  CHECK(0 == product.f());
-  CHECK_EQ(11 + 13 + 64, product.e());
-
-  // Halfway cases are allowed to round either way. So don't check for it.
-
-  // Big numbers.
-  diy_fp1 = DiyFp(V8_2PART_UINT64_C(0xFFFFFFFF, FFFFFFFF), 11);
-  diy_fp2 = DiyFp(V8_2PART_UINT64_C(0xFFFFFFFF, FFFFFFFF), 13);
-  // 128bit result: 0xfffffffffffffffe0000000000000001
-  product = DiyFp::Times(diy_fp1, diy_fp2);
-  CHECK(V8_2PART_UINT64_C(0xFFFFFFFF, FFFFFFFe) == product.f());
-  CHECK_EQ(11 + 13 + 64, product.e());
-}