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[APFloat] add tests for convert of NAN; NFC 

More coverage for the bug fix proposed in D87835.
This commit is contained in:
Sanjay Patel 2020-09-24 07:29:18 -04:00
parent 3ed04f93e3
commit b2c46633d1
1 changed files with 16 additions and 2 deletions
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18
llvm/unittests/ADT/APFloatTest.cpp
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@ -1817,10 +1817,10 @@ TEST(APFloatTest, convert) {
test = APFloat::getSNaN(APFloat::IEEEsingle());
APFloat X87SNaN = APFloat::getSNaN(APFloat::x87DoubleExtended());
test.convert(APFloat::x87DoubleExtended(), APFloat::rmNearestTiesToEven,
&losesInfo);
APFloat::opStatus status = test.convert(APFloat::x87DoubleExtended(), APFloat::rmNearestTiesToEven, &losesInfo);
EXPECT_TRUE(test.bitwiseIsEqual(X87SNaN));
EXPECT_FALSE(losesInfo);
EXPECT_EQ(status, APFloat::opOK);
test = APFloat::getQNaN(APFloat::IEEEsingle());
APFloat X87QNaN = APFloat::getQNaN(APFloat::x87DoubleExtended());
@ -1840,6 +1840,20 @@ TEST(APFloatTest, convert) {
&losesInfo);
EXPECT_TRUE(test.bitwiseIsEqual(X87QNaN));
EXPECT_FALSE(losesInfo);
// FIXME: This is wrong - NaN becomes Inf.
APInt payload(52, 1);
test = APFloat::getSNaN(APFloat::IEEEdouble(), false, &payload);
status = test.convert(APFloat::IEEEsingle(), APFloat::rmNearestTiesToEven, &losesInfo);
EXPECT_EQ(0x7f800000, test.bitcastToAPInt());
EXPECT_TRUE(losesInfo);
EXPECT_EQ(status, APFloat::opOK);
test = APFloat::getQNaN(APFloat::IEEEdouble(), false, &payload);
status = test.convert(APFloat::IEEEsingle(), APFloat::rmNearestTiesToEven, &losesInfo);
EXPECT_EQ(0x7fc00000, test.bitcastToAPInt());
EXPECT_TRUE(losesInfo);
EXPECT_EQ(status, APFloat::opOK);
}
TEST(APFloatTest, PPCDoubleDouble) {