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Move handling of __builtin_nan("") out of CGBuiltin.cpp into ExprConstant.cpp 

llvm-svn: 57157
This commit is contained in:
Chris Lattner 2008-10-06 06:31:58 +00:00
parent a1518b1dfe
commit 0b7282eafc
2 changed files with 19 additions and 18 deletions
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14
clang/lib/AST/ExprConstant.cpp
View File

@ -556,6 +556,20 @@ bool FloatExprEvaluator::VisitCallExpr(const CallExpr *E) {
case Builtin::BI__builtin_infl:
Result = llvm::APFloat::getInf(Sem);
return true;
case Builtin::BI__builtin_nan:
case Builtin::BI__builtin_nanf:
case Builtin::BI__builtin_nanl:
// If this is __builtin_nan("") turn this into a simple nan, otherwise we
// can't constant fold it.
if (const StringLiteral *S =
dyn_cast<StringLiteral>(E->getArg(0)->IgnoreParenCasts())) {
if (!S->isWide() && S->getByteLength() == 0) { // empty string.
Result = llvm::APFloat::getNaN(Sem);
return true;
}
}
return false;
}
}

23
clang/lib/CodeGen/CGBuiltin.cpp
View File

@ -46,11 +46,14 @@ RValue CodeGenFunction::EmitBuiltinExpr(unsigned BuiltinID, const CallExpr *E) {
case Builtin::BI__builtin_inf:
case Builtin::BI__builtin_inff:
case Builtin::BI__builtin_infl:
case Builtin::BI__builtin_nan:
case Builtin::BI__builtin_nanf:
case Builtin::BI__builtin_nanl:
case Builtin::BI__builtin_classify_type:
case Builtin::BI__builtin_constant_p: {
APValue Result;
bool IsCst = E->tryEvaluate(Result, CGM.getContext());
assert(IsCst && "These must all be constants!");
if (!E->tryEvaluate(Result, CGM.getContext()))
break; // Not a constant, expand below.
if (Result.isInt())
return RValue::get(llvm::ConstantInt::get(Result.getInt()));
@ -231,22 +234,6 @@ RValue CodeGenFunction::EmitBuiltinExpr(unsigned BuiltinID, const CallExpr *E) {
return RValue::get(Builder.CreateCall(F));
}
case Builtin::BI__builtin_nan:
case Builtin::BI__builtin_nanf:
case Builtin::BI__builtin_nanl: {
// If this is __builtin_nan("") turn this into a simple nan, otherwise just
// call libm nan.
if (const StringLiteral *S =
dyn_cast<StringLiteral>(E->getArg(0)->IgnoreParenCasts())) {
if (!S->isWide() && S->getByteLength() == 0) { // empty string.
const llvm::fltSemantics &Sem =
CGM.getContext().getFloatTypeSemantics(E->getType());
return RValue::get(ConstantFP::get(APFloat::getNaN(Sem)));
}
}
// Otherwise, call libm 'nan'.
break;
}
case Builtin::BI__builtin_powi:
case Builtin::BI__builtin_powif:
case Builtin::BI__builtin_powil: {