Implement codegen for __builtin_isnormal.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@104118 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGBuiltin.cpp b/lib/CodeGen/CGBuiltin.cpp
index 4bd1b5d..dd505c2 100644
--- a/lib/CodeGen/CGBuiltin.cpp
+++ b/lib/CodeGen/CGBuiltin.cpp
@@ -364,11 +364,25 @@
// TODO: BI__builtin_isinf_sign
// isinf_sign(x) -> isinf(x) ? (signbit(x) ? -1 : 1) : 0
- // TODO: BI__builtin_isnormal
- // isnormal(x) -> x != x && fabs(x) < infinity && fabsf(x) >= float_min
- // where floatmin is the minimum value for the fp type. Not sure if this is
- // APFloat::getSmallest or getSmallestNormalized.
-
+
+ case Builtin::BI__builtin_isnormal: {
+ // isnormal(x) --> x == x && fabsf(x) < infinity && fabsf(x) >= float_min
+ Value *V = EmitScalarExpr(E->getArg(0));
+ Value *Eq = Builder.CreateFCmpOEQ(V, V, "iseq");
+
+ Value *Abs = EmitFAbs(*this, V, E->getArg(0)->getType());
+ Value *IsLessThanInf =
+ Builder.CreateFCmpULT(Abs, ConstantFP::getInfinity(V->getType()),"isinf");
+ APFloat Smallest = APFloat::getSmallestNormalized(
+ getContext().getFloatTypeSemantics(E->getArg(0)->getType()));
+ Value *IsNormal =
+ Builder.CreateFCmpUGE(Abs, ConstantFP::get(V->getContext(), Smallest),
+ "isnormal");
+ V = Builder.CreateAnd(Eq, IsLessThanInf, "and");
+ V = Builder.CreateAnd(V, IsNormal, "and");
+ return RValue::get(Builder.CreateZExt(V, ConvertType(E->getType())));
+ }
+
case Builtin::BI__builtin_isfinite: {
// isfinite(x) --> x == x && fabs(x) != infinity; }
Value *V = EmitScalarExpr(E->getArg(0));