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Implement arithmetic on APFloat with PPCDoubleDouble semantics by

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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
This commit is contained in:
Ulrich Weigand
2012-10-29 18:09:01 +00:00
parent 2fbc239e4f
commit 69c9c8c4cf
2 changed files with 100 additions and 75 deletions
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36
unittests/ADT/APFloatTest.cpp
View File

@@ -737,4 +737,40 @@ TEST(APFloatTest, convert) {
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
}
}