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* [gcc r12-8495] c++: Use fold_non_dependent_expr rather than maybe_constant_value in __builtin_shufflevector handlin
@ 2022-06-19 10:09 Jakub Jelinek
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From: Jakub Jelinek @ 2022-06-19 10:09 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:566e599c8194f789b077eb94a5e45ced2de5b31e
commit r12-8495-g566e599c8194f789b077eb94a5e45ced2de5b31e
Author: Jakub Jelinek <jakub@redhat.com>
Date: Fri Jun 17 17:40:49 2022 +0200
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 a284fadcce8ef443cc3cc047a8017745efb51758)
Diff:
---
gcc/cp/typeck.cc | 2 +-
gcc/testsuite/g++.dg/ext/builtin-shufflevector-4.C | 18 ++++++++++++++++++
2 files changed, 19 insertions(+), 1 deletion(-)
diff --git a/gcc/cp/typeck.cc b/gcc/cp/typeck.cc
index a6c393647b2..ceb80d9744f 100644
--- a/gcc/cp/typeck.cc
+++ b/gcc/cp/typeck.cc
@@ -6334,7 +6334,7 @@ build_x_shufflevector (location_t loc, vec<tree, va_gc> *args,
auto_vec<tree, 16> mask;
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);
}
tree exp = c_build_shufflevector (loc, arg0, arg1, mask, complain & tf_error);
diff --git a/gcc/testsuite/g++.dg/ext/builtin-shufflevector-4.C b/gcc/testsuite/g++.dg/ext/builtin-shufflevector-4.C
new file mode 100644
index 00000000000..dae129b11d6
--- /dev/null
+++ b/gcc/testsuite/g++.dg/ext/builtin-shufflevector-4.C
@@ -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> ();
+}
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