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Implement normalization and simplify power table

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This commit is contained in:
Victor Zverovich
2018-05-27 08:04:30 -07:00
parent 6a5bb6e268
commit 2f257b7291
4 changed files with 90 additions and 52 deletions
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45
test/util-test.cc
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@@ -881,17 +881,40 @@ TEST(UtilTest, ParseNonnegativeInt) {
fmt::format_error, "number is too big");
}
TEST(UtilTest, FPSubtract) {
auto r = fp(123, 1) - fp(102, 1);
EXPECT_EQ(r.f, 21u);
EXPECT_EQ(r.e, 1);
template <bool is_iec559>
void test_construct_from_double() {
fmt::print("warning: double is not IEC559, skipping FP tests\n");
}
TEST(UtilTest, FPMultiply) {
auto r = fp(123ULL << 32, 4) * fp(56ULL << 32, 7);
EXPECT_EQ(r.f, 123u * 56u);
EXPECT_EQ(r.e, 4 + 7 + 64);
r = fp(123ULL << 32, 4) * fp(567ULL << 31, 8);
EXPECT_EQ(r.f, (123 * 567 + 1u) / 2);
EXPECT_EQ(r.e, 4 + 8 + 64);
template <>
void test_construct_from_double<true>() {
auto v = fp(1.23);
EXPECT_EQ(v.f, 0x13ae147ae147aeu);
EXPECT_EQ(v.e, -52);
}
TEST(FPTest, ConstructFromDouble) {
test_construct_from_double<std::numeric_limits<double>::is_iec559>();
}
TEST(FPTest, Normalize) {
auto v = fp(0xbeef, 42);
v.normalize();
EXPECT_EQ(0xbeef000000000000, v.f);
EXPECT_EQ(-6, v.e);
}
TEST(FPTest, Subtract) {
auto v = fp(123, 1) - fp(102, 1);
EXPECT_EQ(v.f, 21u);
EXPECT_EQ(v.e, 1);
}
TEST(FPTest, Multiply) {
auto v = fp(123ULL << 32, 4) * fp(56ULL << 32, 7);
EXPECT_EQ(v.f, 123u * 56u);
EXPECT_EQ(v.e, 4 + 7 + 64);
v = fp(123ULL << 32, 4) * fp(567ULL << 31, 8);
EXPECT_EQ(v.f, (123 * 567 + 1u) / 2);
EXPECT_EQ(v.e, 4 + 8 + 64);
}