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| author | rdivacky <rdivacky@FreeBSD.org> | 2010-03-03 17:28:16 +0000 |
|---|---|---|
| committer | rdivacky <rdivacky@FreeBSD.org> | 2010-03-03 17:28:16 +0000 |
| commit | df90325d4c0a65ee64d2dae3ed9b5b34f7418533 (patch) | |
| tree | e1a885aadfd80632f5bd70d4bd2d37e715e35a79 /lib/AST/ExprConstant.cpp | |
| parent | fd035e6496665b1f1197868e21cb0a4594e8db6e (diff) | |
| download | FreeBSD-src-df90325d4c0a65ee64d2dae3ed9b5b34f7418533.zip FreeBSD-src-df90325d4c0a65ee64d2dae3ed9b5b34f7418533.tar.gz | |
Update clang to 97654.
Diffstat (limited to 'lib/AST/ExprConstant.cpp')
| -rw-r--r-- | lib/AST/ExprConstant.cpp | 46 |
1 files changed, 33 insertions, 13 deletions
diff --git a/lib/AST/ExprConstant.cpp b/lib/AST/ExprConstant.cpp index 1a44cd0..e036692 100644 --- a/lib/AST/ExprConstant.cpp +++ b/lib/AST/ExprConstant.cpp @@ -1560,6 +1560,31 @@ static bool EvaluateFloat(const Expr* E, APFloat& Result, EvalInfo &Info) { return FloatExprEvaluator(Info, Result).Visit(const_cast<Expr*>(E)); } +static bool TryEvaluateBuiltinNaN(ASTContext &Context, + QualType ResultTy, + const Expr *Arg, + bool SNaN, + llvm::APFloat &Result) { + const StringLiteral *S = dyn_cast<StringLiteral>(Arg->IgnoreParenCasts()); + if (!S) return false; + + const llvm::fltSemantics &Sem = Context.getFloatTypeSemantics(ResultTy); + + llvm::APInt fill; + + // Treat empty strings as if they were zero. + if (S->getString().empty()) + fill = llvm::APInt(32, 0); + else if (S->getString().getAsInteger(0, fill)) + return false; + + if (SNaN) + Result = llvm::APFloat::getSNaN(Sem, false, &fill); + else + Result = llvm::APFloat::getQNaN(Sem, false, &fill); + return true; +} + bool FloatExprEvaluator::VisitCallExpr(const CallExpr *E) { switch (E->isBuiltinCall(Info.Ctx)) { default: return false; @@ -1575,24 +1600,19 @@ bool FloatExprEvaluator::VisitCallExpr(const CallExpr *E) { return true; } + case Builtin::BI__builtin_nans: + case Builtin::BI__builtin_nansf: + case Builtin::BI__builtin_nansl: + return TryEvaluateBuiltinNaN(Info.Ctx, E->getType(), E->getArg(0), + true, Result); + case Builtin::BI__builtin_nan: case Builtin::BI__builtin_nanf: case Builtin::BI__builtin_nanl: // If this is __builtin_nan() turn this into a nan, otherwise we // can't constant fold it. - if (const StringLiteral *S = - dyn_cast<StringLiteral>(E->getArg(0)->IgnoreParenCasts())) { - if (!S->isWide()) { - const llvm::fltSemantics &Sem = - Info.Ctx.getFloatTypeSemantics(E->getType()); - unsigned Type = 0; - if (!S->getString().empty() && S->getString().getAsInteger(0, Type)) - return false; - Result = llvm::APFloat::getNaN(Sem, false, Type); - return true; - } - } - return false; + return TryEvaluateBuiltinNaN(Info.Ctx, E->getType(), E->getArg(0), + false, Result); case Builtin::BI__builtin_fabs: case Builtin::BI__builtin_fabsf: |
