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Add minnum / maxnum intrinsics

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These are named following the IEEE-754 names for these
functions, rather than the libm fmin / fmax to avoid
possible ambiguities. Some languages may implement something
resembling fmin / fmax which return NaN if either operand is
to propagate errors. These implement the IEEE-754 semantics
of returning the other operand if either is a NaN representing
missing data.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220341 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matt Arsenault
2014-10-21 23:00:20 +00:00
parent cb3866e72e
commit 252134602f
14 changed files with 773 additions and 2 deletions
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15
lib/Analysis/ConstantFolding.cpp
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@ -1229,6 +1229,8 @@ Constant *llvm::ConstantFoldLoadThroughGEPIndices(Constant *C,
bool llvm::canConstantFoldCallTo(const Function *F) {
switch (F->getIntrinsicID()) {
case Intrinsic::fabs:
case Intrinsic::minnum:
case Intrinsic::maxnum:
case Intrinsic::log:
case Intrinsic::log2:
case Intrinsic::log10:
@ -1625,6 +1627,19 @@ static Constant *ConstantFoldScalarCall(StringRef Name, unsigned IntrinsicID,
V1.copySign(V2);
return ConstantFP::get(Ty->getContext(), V1);
}
if (IntrinsicID == Intrinsic::minnum) {
const APFloat &C1 = Op1->getValueAPF();
const APFloat &C2 = Op2->getValueAPF();
return ConstantFP::get(Ty->getContext(), minnum(C1, C2));
}
if (IntrinsicID == Intrinsic::maxnum) {
const APFloat &C1 = Op1->getValueAPF();
const APFloat &C2 = Op2->getValueAPF();
return ConstantFP::get(Ty->getContext(), maxnum(C1, C2));
}
if (!TLI)
return nullptr;
if (Name == "pow" && TLI->has(LibFunc::pow))