c++: Use fold_non_dependent_expr rather than maybe_constant_value in __builtin_shufflevector handling [PR106001]
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
)
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@ -6334,7 +6334,7 @@ build_x_shufflevector (location_t loc, vec<tree, va_gc> *args,
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auto_vec<tree, 16> mask;
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for (unsigned i = 2; i < args->length (); ++i)
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{
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tree idx = maybe_constant_value ((*args)[i]);
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tree idx = fold_non_dependent_expr ((*args)[i], complain);
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mask.safe_push (idx);
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}
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tree exp = c_build_shufflevector (loc, arg0, arg1, mask, complain & tf_error);
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@ -0,0 +1,18 @@
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// PR c++/106001
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// { dg-do compile }
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typedef int V __attribute__((vector_size (2 * sizeof (int))));
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template <int>
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void
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foo ()
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{
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V v = {};
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v = __builtin_shufflevector (v, v, static_cast<char>(1), static_cast<char>(0));
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}
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void
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bar ()
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{
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foo <0> ();
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}
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