Implement arithmetic on APFloat with PPCDoubleDouble semantics by
treating it as if it were an IEEE floating-point type with 106-bit
mantissa.
This makes compile-time arithmetic on "long double" for PowerPC
in clang (in particular parsing of floating point constants)
work, and fixes all "long double" related failures in the test
suite.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166951 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/unittests/ADT/APFloatTest.cpp b/unittests/ADT/APFloatTest.cpp
index c8d7177..48d5d83 100644
--- a/unittests/ADT/APFloatTest.cpp
+++ b/unittests/ADT/APFloatTest.cpp
@@ -737,4 +737,40 @@
EXPECT_EQ(4294967295.0, test.convertToDouble());
EXPECT_FALSE(losesInfo);
}
+
+TEST(APFloatTest, PPCDoubleDouble) {
+ APFloat test(APFloat::PPCDoubleDouble, "1.0");
+ EXPECT_EQ(0x3ff0000000000000ull, test.bitcastToAPInt().getRawData()[0]);
+ EXPECT_EQ(0x0000000000000000ull, test.bitcastToAPInt().getRawData()[1]);
+
+ test.divide(APFloat(APFloat::PPCDoubleDouble, "3.0"), APFloat::rmNearestTiesToEven);
+ EXPECT_EQ(0x3fd5555555555555ull, test.bitcastToAPInt().getRawData()[0]);
+ EXPECT_EQ(0x3c75555555555556ull, test.bitcastToAPInt().getRawData()[1]);
+
+ // LDBL_MAX
+ test = APFloat(APFloat::PPCDoubleDouble, "1.79769313486231580793728971405301e+308");
+ EXPECT_EQ(0x7fefffffffffffffull, test.bitcastToAPInt().getRawData()[0]);
+ EXPECT_EQ(0x7c8ffffffffffffeull, test.bitcastToAPInt().getRawData()[1]);
+
+ // LDBL_MIN
+ test = APFloat(APFloat::PPCDoubleDouble, "2.00416836000897277799610805135016e-292");
+ EXPECT_EQ(0x0360000000000000ull, test.bitcastToAPInt().getRawData()[0]);
+ EXPECT_EQ(0x0000000000000000ull, test.bitcastToAPInt().getRawData()[1]);
+
+ test = APFloat(APFloat::PPCDoubleDouble, "1.0");
+ test.add(APFloat(APFloat::PPCDoubleDouble, "0x1p-105"), APFloat::rmNearestTiesToEven);
+ EXPECT_EQ(0x3ff0000000000000ull, test.bitcastToAPInt().getRawData()[0]);
+ EXPECT_EQ(0x3960000000000000ull, test.bitcastToAPInt().getRawData()[1]);
+
+ test = APFloat(APFloat::PPCDoubleDouble, "1.0");
+ test.add(APFloat(APFloat::PPCDoubleDouble, "0x1p-106"), APFloat::rmNearestTiesToEven);
+ EXPECT_EQ(0x3ff0000000000000ull, test.bitcastToAPInt().getRawData()[0]);
+#if 0 // XFAIL
+ // This is what we would expect with a true double-double implementation
+ EXPECT_EQ(0x3950000000000000ull, test.bitcastToAPInt().getRawData()[1]);
+#else
+ // This is what we get with our 106-bit mantissa approximation
+ EXPECT_EQ(0x0000000000000000ull, test.bitcastToAPInt().getRawData()[1]);
+#endif
+}
}