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Add support for evaluation of exp/log/log10/pow

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13011 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-04-16 22:35:33 +00:00
parent 657253119e
commit f5b9eb37a9
1 changed files with 25 additions and 1 deletions
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26
lib/Transforms/Utils/Local.cpp
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@ -233,7 +233,8 @@ bool llvm::ConstantFoldTerminator(BasicBlock *BB) {
/// the specified function.
bool llvm::canConstantFoldCallTo(Function *F) {
const std::string &Name = F->getName();
return Name == "sin" || Name == "cos" || Name == "tan" || Name == "sqrt";
return Name == "sin" || Name == "cos" || Name == "tan" || Name == "sqrt" ||
Name == "log" || Name == "log10" || Name == "exp" || Name == "pow";
}
/// ConstantFoldCall - Attempt to constant fold a call to the specified function
@ -263,6 +264,29 @@ Constant *llvm::ConstantFoldCall(Function *F,
if (ConstantFP *CFP = dyn_cast<ConstantFP>(Operands[0]))
if (CFP->getValue() >= 0)
return ConstantFP::get(Ty, sqrt(CFP->getValue()));
} else if (Name == "exp") {
if (Operands.size() == 1)
if (ConstantFP *CFP = dyn_cast<ConstantFP>(Operands[0]))
return ConstantFP::get(Ty, exp(CFP->getValue()));
} else if (Name == "log") {
if (Operands.size() == 1)
if (ConstantFP *CFP = dyn_cast<ConstantFP>(Operands[0]))
if (CFP->getValue() > 0)
return ConstantFP::get(Ty, log(CFP->getValue()));
} else if (Name == "log10") {
if (Operands.size() == 1)
if (ConstantFP *CFP = dyn_cast<ConstantFP>(Operands[0]))
if (CFP->getValue() > 0)
return ConstantFP::get(Ty, log10(CFP->getValue()));
} else if (Name == "pow") {
if (Operands.size() == 2)
if (ConstantFP *Op1 = dyn_cast<ConstantFP>(Operands[0]))
if (ConstantFP *Op2 = dyn_cast<ConstantFP>(Operands[1])) {
errno = 0;
double V = pow(Op1->getValue(), Op2->getValue());
if (errno == 0)
return ConstantFP::get(Ty, V);
}
}
return 0;
}