PR4836, part 2: CodeGen for __builtin_isnan.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@80655 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/CGBuiltin.cpp b/lib/CodeGen/CGBuiltin.cpp
index 9ba5f71f3c6aa4eb6c56f7dfb4a7b3dd613cd839..bfb6be8b79179fbb811627fac44fd064cbb429b4 100644 (file)
--- a/lib/CodeGen/CGBuiltin.cpp
+++ b/lib/CodeGen/CGBuiltin.cpp
@@ -271,6 +271,11 @@ RValue CodeGenFunction::EmitBuiltinExpr(const FunctionDecl *FD,
     return RValue::get(Builder.CreateZExt(LHS, ConvertType(E->getType()),
                                           "tmp"));
   }
+  case Builtin::BI__builtin_isnan: {
+    Value *V = EmitScalarExpr(E->getArg(0));
+    V = Builder.CreateFCmpUNO(V, V, "cmp");
+    return RValue::get(Builder.CreateZExt(V, ConvertType(E->getType()), "tmp"));
+  }
   case Builtin::BIalloca:
   case Builtin::BI__builtin_alloca: {
     // FIXME: LLVM IR Should allow alloca with an i64 size!

diff --git a/test/CodeGen/builtins.c b/test/CodeGen/builtins.c
index ce5cd74bd4c4d0331baad97d402baa330a6c5fd1..165db9c267539bd7bd26d1e61d68d2a97d96c98c 100644 (file)
--- a/test/CodeGen/builtins.c
+++ b/test/CodeGen/builtins.c
@@ -54,6 +54,8 @@ int main() {
   P(islessgreater, (1., 2.));
   P(isunordered, (1., 2.));
 
+  P(isnan, (1.));
+
   // Bitwise & Numeric Functions
 
   P(abs, (N));