simple implementation of __builtin_alloca

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@46783 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 4 insertions, 0 deletions

diff --git a/CodeGen/CGBuiltin.cpp b/CodeGen/CGBuiltin.cpp
index f3eef1f4ae..996978e138 100644
--- a/CodeGen/CGBuiltin.cpp
+++ b/CodeGen/CGBuiltin.cpp
@@ -205,6 +205,10 @@ RValue CodeGenFunction::EmitBuiltinExpr(unsigned BuiltinID, const CallExpr *E) {
     return RValue::get(Builder.CreateZExt(LHS, ConvertType(E->getType()),
                                           "tmp"));
   }
+  case Builtin::BI__builtin_alloca:
+    return RValue::get(Builder.CreateAlloca(llvm::Type::Int8Ty,
+                                            EmitScalarExpr(E->getArg(0)),
+                                            "tmp"));
   }
   return RValue::get(0);
 }