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Constant fold the isnan intrinsic

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14150 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-06-11 06:16:23 +00:00
parent 7ba02f1115
commit cf11035a6f
1 changed files with 10 additions and 1 deletions
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11
lib/Transforms/Utils/Local.cpp
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@ -15,6 +15,7 @@
#include "llvm/Transforms/Utils/Local.h"
#include "llvm/Constants.h"
#include "llvm/Instructions.h"
#include "llvm/Intrinsics.h"
#include <cerrno>
#include <cmath>
using namespace llvm;
@ -234,6 +235,12 @@ bool llvm::ConstantFoldTerminator(BasicBlock *BB) {
/// the specified function.
bool llvm::canConstantFoldCallTo(Function *F) {
const std::string &Name = F->getName();
switch (F->getIntrinsicID()) {
case Intrinsic::isnan: return true;
default: break;
}
return Name == "sin" || Name == "cos" || Name == "tan" || Name == "sqrt" ||
Name == "log" || Name == "log10" || Name == "exp" || Name == "pow" ||
Name == "acos" || Name == "asin" || Name == "atan" || Name == "fmod";
@ -258,7 +265,9 @@ Constant *llvm::ConstantFoldCall(Function *F,
if (Operands.size() == 1) {
if (ConstantFP *Op = dyn_cast<ConstantFP>(Operands[0])) {
double V = Op->getValue();
if (Name == "sin")
if (Name == "llvm.isnan")
return ConstantBool::get(isnan(V));
else if (Name == "sin")
return ConstantFP::get(Ty, sin(V));
else if (Name == "cos")
return ConstantFP::get(Ty, cos(V));