https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78089
Bug ID: 78089
Summary: __builtin_shuffle parsing bug
Product: gcc
Version: 7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: jakub at gcc dot gnu.org
Target Milestone: ---
typedef int V __attribute__((vector_size (16)));
V a, b, c;
int
foo ()
{
return __builtin_shuffle (a, b, c)[3];
}
int
main ()
{
a = (V) { 1, 2, 3, 4 };
b = (V) { 5, 6, 7, 8 };
c = (V) { 7, 2, 5, 6 };
if (foo () != 7)
__builtin_abort ();
return 0;
}
is accepted in C, but rejected in C++, already starting with its introduction
in 4.7. In C++ __builtin_shuffle (a, b, c) is parsed as postfix-expression
rather than primary-expression, so [3] above is ignored.
