http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47197
--- Comment #2 from joseph at codesourcery dot com <joseph at codesourcery dot
com> 2012-04-23 21:46:23 UTC ---
On Wed, 18 Apr 2012, wschmidt at gcc dot gnu.org wrote:
> Joseph, could you please take a look? Or let me know if you think it's not a
> front end problem.
In rs6000-c.c, when you put an argument inside a CALL_EXPR or SAVE_EXPR as
part of resolving an AltiVec built-in function, you need to use
c_fully_fold because subsequent calls to c_fully_fold won't look inside
that expression. In such a case, you can do
bool maybe_const = true;
if (!c_dialect_cxx ())
expr = c_fully_fold (expr, false, &maybe_const);
before using the new value of expr (and ignore whatever value maybe_const
may have been set to).
