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| 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 | |
| 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
| -rw-r--r-- | include/clang/Basic/Builtins.def | 5 | ||||
| -rw-r--r-- | lib/CodeGen/CGBuiltin.cpp | 17 | ||||
| -rw-r--r-- | test/CodeGen/builtins.c | 1 |
3 files changed, 23 insertions, 0 deletions
diff --git a/include/clang/Basic/Builtins.def b/include/clang/Basic/Builtins.def index 9442ac3287..af233b81e0 100644 --- a/include/clang/Basic/Builtins.def +++ b/include/clang/Basic/Builtins.def @@ -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") 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 diff --git a/test/CodeGen/builtins.c b/test/CodeGen/builtins.c index 417ca7def5..a4424d7742 100644 --- a/test/CodeGen/builtins.c +++ b/test/CodeGen/builtins.c @@ -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; } |