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[ADT] Add basic operator overloads for arithmetic to APFloat to make

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code using it more readable.

Also add a copySign static function that works more like the standard
function by accepting the value and sign-carying value as arguments.

No interesting logic here, but tests added to cover the basic API
additions and make sure they do something plausible.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219453 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chandler Carruth 2014-10-09 23:26:15 +00:00
parent a4554c2897
commit 0ffdb31af0
2 changed files with 59 additions and 0 deletions
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39
include/llvm/ADT/APFloat.h
View File

@ -304,6 +304,38 @@ public:
/// IEEE-754R 5.3.1: nextUp/nextDown.
opStatus next(bool nextDown);
/// \brief Operator+ overload which provides the default
/// \c nmNearestTiesToEven rounding mode and *no* error checking.
APFloat operator+(const APFloat &RHS) const {
APFloat Result = *this;
Result.add(RHS, rmNearestTiesToEven);
return Result;
}
/// \brief Operator- overload which provides the default
/// \c nmNearestTiesToEven rounding mode and *no* error checking.
APFloat operator-(const APFloat &RHS) const {
APFloat Result = *this;
Result.subtract(RHS, rmNearestTiesToEven);
return Result;
}
/// \brief Operator* overload which provides the default
/// \c nmNearestTiesToEven rounding mode and *no* error checking.
APFloat operator*(const APFloat &RHS) const {
APFloat Result = *this;
Result.multiply(RHS, rmNearestTiesToEven);
return Result;
}
/// \brief Operator/ overload which provides the default
/// \c nmNearestTiesToEven rounding mode and *no* error checking.
APFloat operator/(const APFloat &RHS) const {
APFloat Result = *this;
Result.divide(RHS, rmNearestTiesToEven);
return Result;
}
/// @}
/// \name Sign operations.
@ -313,6 +345,13 @@ public:
void clearSign();
void copySign(const APFloat &);
/// \brief A static helper to produce a copy of an APFloat value with its sign
/// copied from some other APFloat.
static APFloat copySign(APFloat Value, const APFloat &Sign) {
Value.copySign(Sign);
return std::move(Value);
}
/// @}
/// \name Conversions

20
unittests/ADT/APFloatTest.cpp
View File

@ -1342,6 +1342,17 @@ TEST(APFloatTest, getZero) {
}
}
TEST(APFloatTest, copySign) {
EXPECT_TRUE(APFloat(-42.0).bitwiseIsEqual(
APFloat::copySign(APFloat(42.0), APFloat(-1.0))));
EXPECT_TRUE(APFloat(42.0).bitwiseIsEqual(
APFloat::copySign(APFloat(-42.0), APFloat(1.0))));
EXPECT_TRUE(APFloat(-42.0).bitwiseIsEqual(
APFloat::copySign(APFloat(-42.0), APFloat(-1.0))));
EXPECT_TRUE(APFloat(42.0).bitwiseIsEqual(
APFloat::copySign(APFloat(42.0), APFloat(1.0))));
}
TEST(APFloatTest, convert) {
bool losesInfo;
APFloat test(APFloat::IEEEdouble, "1.0");
@ -2671,4 +2682,13 @@ TEST(APFloatTest, divide) {
}
}
TEST(APFloatTest, operatorOverloads) {
// This is mostly testing that these operator overloads compile.
APFloat One = APFloat(APFloat::IEEEsingle, "0x1p+0");
APFloat Two = APFloat(APFloat::IEEEsingle, "0x2p+0");
EXPECT_TRUE(Two.bitwiseIsEqual(One + One));
EXPECT_TRUE(One.bitwiseIsEqual(Two - One));
EXPECT_TRUE(Two.bitwiseIsEqual(One * Two));
EXPECT_TRUE(One.bitwiseIsEqual(Two / Two));
}
}