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[ADT] Add the scalbn function for APFloat.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219473 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chandler Carruth
2014-10-10 04:54:30 +00:00
parent 9ea4dd2eed
commit cb84b21243
3 changed files with 66 additions and 2 deletions
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17
lib/Support/APFloat.cpp
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@ -3906,3 +3906,20 @@ APFloat::makeZero(bool Negative) {
exponent = semantics->minExponent-1;
APInt::tcSet(significandParts(), 0, partCount());
}
APFloat llvm::scalbn(APFloat X, int Exp) {
if (X.isInfinity() || X.isZero() || X.isNaN())
return std::move(X);
auto MaxExp = X.getSemantics().maxExponent;
auto MinExp = X.getSemantics().minExponent;
if (Exp > (MaxExp - X.exponent))
// Overflow saturates to infinity.
return APFloat::getInf(X.getSemantics(), X.isNegative());
if (Exp < (MinExp - X.exponent))
// Underflow saturates to zero.
return APFloat::getZero(X.getSemantics(), X.isNegative());
X.exponent += Exp;
return std::move(X);
}