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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
This commit is contained in:
Eli Friedman 2010-03-06 02:17:52 +00:00
parent af9553a23a
commit 99d20f83ba
3 changed files with 23 additions and 0 deletions
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5
clang/include/clang/Basic/Builtins.def
View File

@ -240,6 +240,11 @@ BUILTIN(__builtin_isinf_sign, "i.", "nc")
BUILTIN(__builtin_isnan, "i.", "nc")
BUILTIN(__builtin_isnormal, "i.", "nc")
// FP signbit builtins
BUILTIN(__builtin_signbit, "id", "nc")
BUILTIN(__builtin_signbitf, "if", "nc")
BUILTIN(__builtin_signbitl, "iLd", "nc")
// Builtins for arithmetic.
BUILTIN(__builtin_clz , "iUi" , "nc")
BUILTIN(__builtin_clzl , "iULi" , "nc")

17
clang/lib/CodeGen/CGBuiltin.cpp
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@ -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

1
clang/test/CodeGen/builtins.c
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@ -118,6 +118,7 @@ int main() {
// V(clear_cache, (&N, &N+1));
V(trap, ());
R(extract_return_addr, (&N));
P(signbit, (1.0));
return 0;
}