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Implement handmade FP

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This commit is contained in:
Victor Zverovich
2018-04-21 17:26:24 -07:00
parent 822eccc3b8
commit cd90097ca4
3 changed files with 58 additions and 5 deletions
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16
test/util-test.cc
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@@ -37,6 +37,7 @@ using fmt::basic_format_arg;
using fmt::internal::basic_buffer;
using fmt::basic_memory_buffer;
using fmt::string_view;
using fmt::internal::fp;
using fmt::internal::value;
using testing::_;
@@ -869,3 +870,18 @@ TEST(UtilTest, ParseNonnegativeInt) {
parse_nonnegative_int(s, fmt::internal::error_handler()),
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);
}
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);
}