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Implement constant folding of fmod, which is used a lot in povray

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13823 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-05-27 07:25:00 +00:00
parent b04cb7daf5
commit 8dfe5705b1
1 changed files with 9 additions and 2 deletions
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11
lib/Transforms/Utils/Local.cpp
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@ -236,7 +236,7 @@ bool llvm::canConstantFoldCallTo(Function *F) {
const std::string &Name = F->getName();
return Name == "sin" || Name == "cos" || Name == "tan" || Name == "sqrt" ||
Name == "log" || Name == "log10" || Name == "exp" || Name == "pow" ||
Name == "acos" || Name == "asin";
Name == "acos" || Name == "asin" || Name == "atan" || Name == "fmod";
}
static Constant *ConstantFoldFP(double (*NativeFP)(double), double V,
@ -282,9 +282,16 @@ Constant *llvm::ConstantFoldCall(Function *F,
} else if (Operands.size() == 2) {
if (ConstantFP *Op1 = dyn_cast<ConstantFP>(Operands[0]))
if (ConstantFP *Op2 = dyn_cast<ConstantFP>(Operands[1])) {
double Op1V = Op1->getValue(), Op2V = Op2->getValue();
if (Name == "pow") {
errno = 0;
double V = pow(Op1->getValue(), Op2->getValue());
double V = pow(Op1V, Op2V);
if (errno == 0)
return ConstantFP::get(Ty, V);
} else if (Name == "fmod") {
errno = 0;
double V = fmod(Op1V, Op2V);
if (errno == 0)
return ConstantFP::get(Ty, V);
}