commit 70d38f3179251bb3e7253a52bf54f8fa2314590a
author Richard Smith <richard-llvm@metafoo.co.uk> Fri Sep 28 20:20:52 2012 +0000
committer Richard Smith <richard-llvm@metafoo.co.uk> Fri Sep 28 20:20:52 2012 +0000
tree 46ee9625372573bfc1f27b811616cc40db4d2f44
parent 65eaecf09ea407626fa5b88178b579f2ce5f4177

Allow __builtin_bswap32/64 in constant expressions, like gcc does. Patch by Tijl Coosemans!


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@164841 91177308-0d34-0410-b5e6-96231b3b80d8

lib/AST/ExprConstant.cpp

diff --git a/lib/AST/ExprConstant.cpp b/lib/AST/ExprConstant.cpp
index 8f3f84d..c4fd70a 100644
--- a/lib/AST/ExprConstant.cpp
+++ b/lib/AST/ExprConstant.cpp
@@ -4296,6 +4296,15 @@
     return Error(E);
   }
 
+  case Builtin::BI__builtin_bswap32:
+  case Builtin::BI__builtin_bswap64: {
+    APSInt Val;
+    if (!EvaluateInteger(E->getArg(0), Val, Info))
+      return false;
+
+    return Success(Val.byteSwap(), E);
+  }
+
   case Builtin::BI__builtin_classify_type:
     return Success(EvaluateBuiltinClassifyType(E), E);