diff options
| author | Eli Friedman <eli.friedman@gmail.com> | 2010-03-06 02:17:52 +0000 |
|---|---|---|
| committer | Eli Friedman <eli.friedman@gmail.com> | 2010-03-06 02:17:52 +0000 |
| commit | ba68b08a05587490ed4c2e3d26f3a742c995c660 (patch) | |
| tree | edea301b7819a592fa591bd88e405ab4049dd79e /lib/CodeGen/CGBuiltin.cpp | |
| parent | dbf217af72acefe7702c65dad2d5e534b3de9674 (diff) | |
PR6515: Implement __builtin_signbit and friends.
I'm reasonably sure my implementation is correct, but it would be nice if
someone could double-check.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@97864 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/CGBuiltin.cpp')
| -rw-r--r-- | lib/CodeGen/CGBuiltin.cpp | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/lib/CodeGen/CGBuiltin.cpp b/lib/CodeGen/CGBuiltin.cpp index 8703c381b2..706e4411fc 100644 --- a/lib/CodeGen/CGBuiltin.cpp +++ b/lib/CodeGen/CGBuiltin.cpp @@ -682,6 +682,23 @@ RValue CodeGenFunction::EmitBuiltinExpr(const FunctionDecl *FD, Value *F = CGM.getIntrinsic(Intrinsic::pow, &ArgType, 1); return RValue::get(Builder.CreateCall2(F, Base, Exponent, "tmp")); } + + case Builtin::BI__builtin_signbit: + case Builtin::BI__builtin_signbitf: + case Builtin::BI__builtin_signbitl: { + LLVMContext &C = CGM.getLLVMContext(); + + Value *Arg = EmitScalarExpr(E->getArg(0)); + const llvm::Type *ArgTy = Arg->getType(); + if (ArgTy->isPPC_FP128Ty()) + break; // FIXME: I'm not sure what the right implementation is here. + int ArgWidth = ArgTy->getPrimitiveSizeInBits(); + const llvm::Type *ArgIntTy = llvm::IntegerType::get(C, ArgWidth); + Value *BCArg = Builder.CreateBitCast(Arg, ArgIntTy); + Value *ZeroCmp = llvm::Constant::getNullValue(ArgIntTy); + Value *Result = Builder.CreateICmpSLT(BCArg, ZeroCmp); + return RValue::get(Builder.CreateZExt(Result, ConvertType(E->getType()))); + } } // If this is an alias for a libm function (e.g. __builtin_sin) turn it into |