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c++: Use fold_non_dependent_expr rather than maybe_constant_value in __builtin_shufflevector handling [PR106001]

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In this case the STATIC_CAST_EXPR expressions in the call aren't
type nor value dependent, but maybe_constant_value still ICEs on those
when processing_template_decl.  Calling fold_non_dependent_expr on it
instead fixes the ICE and folds them to INTEGER_CSTs.

2022-06-17  Jakub Jelinek  <jakub@redhat.com>

	PR c++/106001
	* typeck.cc (build_x_shufflevector): Use fold_non_dependent_expr
	instead of maybe_constant_value.

	* g++.dg/ext/builtin-shufflevector-4.C: New test.

(cherry picked from commit a284fadcce)
This commit is contained in:
Jakub Jelinek 2022-06-17 17:40:49 +02:00
parent 86e10e471f
commit 566e599c81
2 changed files with 19 additions and 1 deletions
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2
gcc/cp/typeck.cc
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@ -6334,7 +6334,7 @@ build_x_shufflevector (location_t loc, vec<tree, va_gc> *args,
auto_vec<tree, 16> mask; auto_vec<tree, 16> mask;
for (unsigned i = 2; i < args->length (); ++i) for (unsigned i = 2; i < args->length (); ++i)
{ {
tree idx = maybe_constant_value ((*args)[i]); tree idx = fold_non_dependent_expr ((*args)[i], complain);
mask.safe_push (idx); mask.safe_push (idx);
} }
tree exp = c_build_shufflevector (loc, arg0, arg1, mask, complain & tf_error); tree exp = c_build_shufflevector (loc, arg0, arg1, mask, complain & tf_error);

18
gcc/testsuite/g++.dg/ext/builtin-shufflevector-4.C Normal file
View File

@ -0,0 +1,18 @@
// PR c++/106001
// { dg-do compile }
typedef int V __attribute__((vector_size (2 * sizeof (int))));
template <int>
void
foo ()
{
V v = {};
v = __builtin_shufflevector (v, v, static_cast<char>(1), static_cast<char>(0));
}
void
bar ()
{
foo <0> ();
}