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Issue 804005: Revert grisu commits. (Closed) Base URL: http://v8.googlecode.com/svn/branches/bleeding_edge/
Patch Set: Created 10 years, 9 months ago
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1 // Copyright 2006-2008 the V8 project authors. All rights reserved.
2
3 #include <stdlib.h>
4
5 #include "v8.h"
6
7 #include "platform.h"
8 #include "cctest.h"
9 #include "diy_fp.h"
10
11 using namespace v8::internal;
12
13
14 TEST(Subtract) {
15 DiyFp diy_fp1 = DiyFp(3, 0);
16 DiyFp diy_fp2 = DiyFp(1, 0);
17 DiyFp diff = DiyFp::Minus(diy_fp1, diy_fp2);
18
19 CHECK(2 == diff.f());
20 CHECK_EQ(0, diff.e());
21 diy_fp1.Subtract(diy_fp2);
22 CHECK(2 == diy_fp1.f());
23 CHECK_EQ(0, diy_fp1.e());
24 }
25
26
27 TEST(Multiply) {
28 DiyFp diy_fp1 = DiyFp(3, 0);
29 DiyFp diy_fp2 = DiyFp(2, 0);
30 DiyFp product = DiyFp::Times(diy_fp1, diy_fp2);
31
32 CHECK(0 == product.f());
33 CHECK_EQ(64, product.e());
34 diy_fp1.Multiply(diy_fp2);
35 CHECK(0 == diy_fp1.f());
36 CHECK_EQ(64, diy_fp1.e());
37
38 diy_fp1 = DiyFp(V8_2PART_UINT64_C(0x80000000, 00000000), 11);
39 diy_fp2 = DiyFp(2, 13);
40 product = DiyFp::Times(diy_fp1, diy_fp2);
41 CHECK(1 == product.f());
42 CHECK_EQ(11 + 13 + 64, product.e());
43
44 // Test rounding.
45 diy_fp1 = DiyFp(V8_2PART_UINT64_C(0x80000000, 00000001), 11);
46 diy_fp2 = DiyFp(1, 13);
47 product = DiyFp::Times(diy_fp1, diy_fp2);
48 CHECK(1 == product.f());
49 CHECK_EQ(11 + 13 + 64, product.e());
50
51 diy_fp1 = DiyFp(V8_2PART_UINT64_C(0x7fffffff, ffffffff), 11);
52 diy_fp2 = DiyFp(1, 13);
53 product = DiyFp::Times(diy_fp1, diy_fp2);
54 CHECK(0 == product.f());
55 CHECK_EQ(11 + 13 + 64, product.e());
56
57 // Halfway cases are allowed to round either way. So don't check for it.
58
59 // Big numbers.
60 diy_fp1 = DiyFp(V8_2PART_UINT64_C(0xFFFFFFFF, FFFFFFFF), 11);
61 diy_fp2 = DiyFp(V8_2PART_UINT64_C(0xFFFFFFFF, FFFFFFFF), 13);
62 // 128bit result: 0xfffffffffffffffe0000000000000001
63 product = DiyFp::Times(diy_fp1, diy_fp2);
64 CHECK(V8_2PART_UINT64_C(0xFFFFFFFF, FFFFFFFe) == product.f());
65 CHECK_EQ(11 + 13 + 64, product.e());
66 }
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