commit 80ac9efec467cdad333d47e587921bbfd412ca35
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 79ae9c7a26df2b8ae9f01da2f7d28ebb73c5bb16
parent 334dad6aeaa59a21fbfd6a54498e79fa699a7734

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

llvm-svn: 164841

clang/lib/AST/ExprConstant.cpp

diff --git a/clang/lib/AST/ExprConstant.cpp b/clang/lib/AST/ExprConstant.cpp
index 8f3f84d..c4fd70a 100644
--- a/clang/lib/AST/ExprConstant.cpp
+++ b/clang/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);