PR6515: Implement __builtin_signbit and friends.
I'm reasonably sure my implementation is correct, but it would be nice if someone could double-check. llvm-svn: 97864
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@ -240,6 +240,11 @@ BUILTIN(__builtin_isinf_sign, "i.", "nc")
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BUILTIN(__builtin_isnan, "i.", "nc")
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BUILTIN(__builtin_isnormal, "i.", "nc")
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// FP signbit builtins
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BUILTIN(__builtin_signbit, "id", "nc")
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BUILTIN(__builtin_signbitf, "if", "nc")
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BUILTIN(__builtin_signbitl, "iLd", "nc")
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// Builtins for arithmetic.
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BUILTIN(__builtin_clz , "iUi" , "nc")
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BUILTIN(__builtin_clzl , "iULi" , "nc")
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@ -682,6 +682,23 @@ RValue CodeGenFunction::EmitBuiltinExpr(const FunctionDecl *FD,
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Value *F = CGM.getIntrinsic(Intrinsic::pow, &ArgType, 1);
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return RValue::get(Builder.CreateCall2(F, Base, Exponent, "tmp"));
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}
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case Builtin::BI__builtin_signbit:
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case Builtin::BI__builtin_signbitf:
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case Builtin::BI__builtin_signbitl: {
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LLVMContext &C = CGM.getLLVMContext();
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Value *Arg = EmitScalarExpr(E->getArg(0));
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const llvm::Type *ArgTy = Arg->getType();
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if (ArgTy->isPPC_FP128Ty())
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break; // FIXME: I'm not sure what the right implementation is here.
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int ArgWidth = ArgTy->getPrimitiveSizeInBits();
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const llvm::Type *ArgIntTy = llvm::IntegerType::get(C, ArgWidth);
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Value *BCArg = Builder.CreateBitCast(Arg, ArgIntTy);
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Value *ZeroCmp = llvm::Constant::getNullValue(ArgIntTy);
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Value *Result = Builder.CreateICmpSLT(BCArg, ZeroCmp);
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return RValue::get(Builder.CreateZExt(Result, ConvertType(E->getType())));
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}
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}
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// If this is an alias for a libm function (e.g. __builtin_sin) turn it into
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@ -118,6 +118,7 @@ int main() {
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// V(clear_cache, (&N, &N+1));
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V(trap, ());
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R(extract_return_addr, (&N));
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P(signbit, (1.0));
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return 0;
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}
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