Hi,
The attached patch makes __builtin_bswap32 and __builtin_bswap64
usable in constant expressions like gcc.
This is my first look at clang code so perhaps review it more
thoroughly than usual.
Index: lib/AST/ExprConstant.cpp
===================================================================
--- lib/AST/ExprConstant.cpp (revision 164714)
+++ lib/AST/ExprConstant.cpp (working copy)
@@ -4296,6 +4296,15 @@ bool IntExprEvaluator::VisitCallExpr(const CallExp
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);
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