From 1c277d0fe896a120766e6df990acdeb9f143e21f Mon Sep 17 00:00:00 2001
From: Eli Friedman <eli.friedman@gmail.com>
Date: Tue, 1 Sep 2009 04:19:44 +0000
Subject: PR4836, part 2: CodeGen for __builtin_isnan.

llvm-svn: 80655
---
 clang/lib/CodeGen/CGBuiltin.cpp | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'clang/lib/CodeGen/CGBuiltin.cpp')

diff --git a/clang/lib/CodeGen/CGBuiltin.cpp b/clang/lib/CodeGen/CGBuiltin.cpp
index 9ba5f71f3c6..bfb6be8b791 100644
--- a/clang/lib/CodeGen/CGBuiltin.cpp
+++ b/clang/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!
-- 
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