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Support single precision floats in grisu formatting

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Fixes #1336
This commit is contained in:
Orivej Desh
2019-10-12 12:17:27 +00:00
committed by Victor Zverovich
parent 91f7619cc9
commit 599e0aef45
4 changed files with 55 additions and 3 deletions
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30
test/format-impl-test.cc
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@@ -221,6 +221,36 @@ TEST(FPTest, ComputeBoundaries) {
EXPECT_EQ(31, upper.e);
}
TEST(FPTest, ComputeFloatBoundaries) {
struct {
double x, lower, upper;
} tests[] = {
// regular
{1.5f, 1.4999999403953552, 1.5000000596046448},
// boundary
{1.0f, 0.9999999701976776, 1.0000000596046448},
// min normal
{1.1754944e-38f, 1.1754942807573643e-38, 1.1754944208872107e-38},
// max subnormal
{1.1754942e-38f, 1.1754941406275179e-38, 1.1754942807573643e-38},
// min subnormal
{1e-45f, 7.006492321624085e-46, 2.1019476964872256e-45},
};
for (auto test : tests) {
auto v = fp(test.x);
fp vlower = normalize(fp(test.lower));
fp vupper = normalize(fp(test.upper));
vlower.f >>= vupper.e - vlower.e;
vlower.e = vupper.e;
fp lower, upper;
v.compute_float_boundaries(lower, upper);
EXPECT_EQ(vlower.f, lower.f);
EXPECT_EQ(vlower.e, lower.e);
EXPECT_EQ(vupper.f, upper.f);
EXPECT_EQ(vupper.e, upper.e);
}
}
TEST(FPTest, Subtract) {
auto v = fp(123, 1) - fp(102, 1);
EXPECT_EQ(v.f, 21u);

2
test/grisu-test.cc
View File

@@ -52,6 +52,8 @@ TEST(GrisuTest, Prettify) {
EXPECT_EQ("12340000000.0", fmt::format("{}", 1234e7));
EXPECT_EQ("12.34", fmt::format("{}", 1234e-2));
EXPECT_EQ("0.001234", fmt::format("{}", 1234e-6));
EXPECT_EQ("0.1", fmt::format("{}", 0.1f));
EXPECT_EQ("0.10000000149011612", fmt::format("{}", double(0.1f)));
}
TEST(GrisuTest, ZeroPrecision) { EXPECT_EQ("1", fmt::format("{:.0}", 1.0)); }