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[APFloat] Overload unary operator-

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Summary:
We already have overloaded binary arithemetic operators so you can write
A+B etc. This patch lets you write -A instead of neg(A).

Subscribers: hiraditya, dexonsmith, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D75236
This commit is contained in:
Jay Foad 2020-02-27 09:50:29 +00:00
parent 39d6261f16
commit 7fd61457ea
2 changed files with 18 additions and 0 deletions
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7
include/llvm/ADT/APFloat.h
View File

@ -1036,6 +1036,13 @@ public:
APFLOAT_DISPATCH_ON_SEMANTICS(next(nextDown));
}
/// Negate an APFloat.
APFloat operator-() const {
APFloat Result(*this);
Result.changeSign();
return Result;
}
/// Add two APFloats, rounding ties to the nearest even.
/// No error checking.
APFloat operator+(const APFloat &RHS) const {

11
unittests/ADT/APFloatTest.cpp
View File

@ -2990,6 +2990,17 @@ TEST(APFloatTest, neg) {
EXPECT_TRUE(Inf.bitwiseIsEqual(neg(NegInf)));
EXPECT_TRUE(NegQNaN.bitwiseIsEqual(neg(QNaN)));
EXPECT_TRUE(QNaN.bitwiseIsEqual(neg(NegQNaN)));
EXPECT_TRUE(NegOne.bitwiseIsEqual(-One));
EXPECT_TRUE(One.bitwiseIsEqual(-NegOne));
EXPECT_TRUE(NegZero.bitwiseIsEqual(-Zero));
EXPECT_TRUE(Zero.bitwiseIsEqual(-NegZero));
EXPECT_TRUE(NegInf.bitwiseIsEqual(-Inf));
EXPECT_TRUE(Inf.bitwiseIsEqual(-NegInf));
EXPECT_TRUE(NegInf.bitwiseIsEqual(-Inf));
EXPECT_TRUE(Inf.bitwiseIsEqual(-NegInf));
EXPECT_TRUE(NegQNaN.bitwiseIsEqual(-QNaN));
EXPECT_TRUE(QNaN.bitwiseIsEqual(-NegQNaN));
}
TEST(APFloatTest, ilogb) {