Fix a problem with APFloat::roundToIntegral where it would return incorrect results for negative inputs to trunc. Add unit tests to verify this behavior.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161929 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/unittests/ADT/APFloatTest.cpp b/unittests/ADT/APFloatTest.cpp
index cc207f7..caa288a 100644
--- a/unittests/ADT/APFloatTest.cpp
+++ b/unittests/ADT/APFloatTest.cpp
@@ -648,6 +648,36 @@
EXPECT_FALSE(APFloat(1.40129846e-45f).getExactInverse(0));
}
+TEST(APFloatTest, roundToIntegral) {
+ APFloat T(-0.5), S(3.14), P(0.0);
+
+ P = T;
+ P.roundToIntegral(APFloat::rmTowardZero);
+ EXPECT_EQ(-0.0, P.convertToDouble());
+ P = T;
+ P.roundToIntegral(APFloat::rmTowardNegative);
+ EXPECT_EQ(-1.0, P.convertToDouble());
+ P = T;
+ P.roundToIntegral(APFloat::rmTowardPositive);
+ EXPECT_EQ(-0.0, P.convertToDouble());
+ P = T;
+ P.roundToIntegral(APFloat::rmNearestTiesToEven);
+ EXPECT_EQ(-0.0, P.convertToDouble());
+
+ P = S;
+ P.roundToIntegral(APFloat::rmTowardZero);
+ EXPECT_EQ(3.0, P.convertToDouble());
+ P = S;
+ P.roundToIntegral(APFloat::rmTowardNegative);
+ EXPECT_EQ(3.0, P.convertToDouble());
+ P = S;
+ P.roundToIntegral(APFloat::rmTowardPositive);
+ EXPECT_EQ(4.0, P.convertToDouble());
+ P = S;
+ P.roundToIntegral(APFloat::rmNearestTiesToEven);
+ EXPECT_EQ(3.0, P.convertToDouble());
+}
+
TEST(APFloatTest, getLargest) {
EXPECT_EQ(3.402823466e+38f, APFloat::getLargest(APFloat::IEEEsingle).convertToFloat());
EXPECT_EQ(1.7976931348623158e+308, APFloat::getLargest(APFloat::IEEEdouble).convertToDouble());