APFloat: Make sure that we get a well-formed x87 NaN when converting from a smaller type.
Fixes PR15054.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@173459 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/unittests/ADT/APFloatTest.cpp b/unittests/ADT/APFloatTest.cpp
index 7345e12..2789835 100644
--- a/unittests/ADT/APFloatTest.cpp
+++ b/unittests/ADT/APFloatTest.cpp
@@ -794,6 +794,32 @@
test.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven, &losesInfo);
EXPECT_EQ(4294967295.0, test.convertToDouble());
EXPECT_FALSE(losesInfo);
+
+ test = APFloat::getSNaN(APFloat::IEEEsingle);
+ APFloat X87SNaN = APFloat::getSNaN(APFloat::x87DoubleExtended);
+ test.convert(APFloat::x87DoubleExtended, APFloat::rmNearestTiesToEven,
+ &losesInfo);
+ EXPECT_TRUE(test.bitwiseIsEqual(X87SNaN));
+ EXPECT_FALSE(losesInfo);
+
+ test = APFloat::getQNaN(APFloat::IEEEsingle);
+ APFloat X87QNaN = APFloat::getQNaN(APFloat::x87DoubleExtended);
+ test.convert(APFloat::x87DoubleExtended, APFloat::rmNearestTiesToEven,
+ &losesInfo);
+ EXPECT_TRUE(test.bitwiseIsEqual(X87QNaN));
+ EXPECT_FALSE(losesInfo);
+
+ test = APFloat::getSNaN(APFloat::x87DoubleExtended);
+ test.convert(APFloat::x87DoubleExtended, APFloat::rmNearestTiesToEven,
+ &losesInfo);
+ EXPECT_TRUE(test.bitwiseIsEqual(X87SNaN));
+ EXPECT_FALSE(losesInfo);
+
+ test = APFloat::getQNaN(APFloat::x87DoubleExtended);
+ test.convert(APFloat::x87DoubleExtended, APFloat::rmNearestTiesToEven,
+ &losesInfo);
+ EXPECT_TRUE(test.bitwiseIsEqual(X87QNaN));
+ EXPECT_FALSE(losesInfo);
}
TEST(APFloatTest, PPCDoubleDouble) {