Here we issue an error from c_build_shufflevector while parsing a template
because it got a TEMPLATE_PARM_INDEX, but this function expects INTEGER_CSTs
(except the first two arguments). It checks if any of the arguments are
type-dependent, if so, we leave the processing for later, but it should
also check value-dependency for the 3rd+ arguments, so as to avoid the
problem above.
This is not a regression -- __builtin_shufflevector was introduced in
GCC 12, but it looks safe enough.
Bootstrapped/regtested on x86_64-pc-linux-gnu, ok for trunk?
PR c++/105353
gcc/cp/ChangeLog:
* typeck.cc (build_x_shufflevector): Use
instantiation_dependent_expression_p except for the first two
arguments.
gcc/testsuite/ChangeLog:
* g++.dg/ext/builtin-shufflevector-3.C: New test.
---
gcc/cp/typeck.cc | 4 +++-
.../g++.dg/ext/builtin-shufflevector-3.C | 23 +++++++++++++++++++
2 files changed, 26 insertions(+), 1 deletion(-)
create mode 100644 gcc/testsuite/g++.dg/ext/builtin-shufflevector-3.C
diff --git a/gcc/cp/typeck.cc b/gcc/cp/typeck.cc
index 26a7cb4b50d..0da6f2485d0 100644
--- a/gcc/cp/typeck.cc
+++ b/gcc/cp/typeck.cc
@@ -6315,7 +6315,9 @@ build_x_shufflevector (location_t loc, vec<tree, va_gc>
*args,
if (processing_template_decl)
{
for (unsigned i = 0; i < args->length (); ++i)
- if (type_dependent_expression_p ((*args)[i]))
+ if (i <= 1
+ ? type_dependent_expression_p ((*args)[i])
+ : instantiation_dependent_expression_p ((*args)[i]))
{
tree exp = build_min_nt_call_vec (NULL, args);
CALL_EXPR_IFN (exp) = IFN_SHUFFLEVECTOR;
diff --git a/gcc/testsuite/g++.dg/ext/builtin-shufflevector-3.C
b/gcc/testsuite/g++.dg/ext/builtin-shufflevector-3.C
new file mode 100644
index 00000000000..0f3cbbee563
--- /dev/null
+++ b/gcc/testsuite/g++.dg/ext/builtin-shufflevector-3.C
@@ -0,0 +1,23 @@
+// PR c++/105353
+// { dg-do compile { target c++17 } }
+// { dg-additional-options "-Wno-psabi" }
+
+typedef unsigned char Simd128U8VectT __attribute__((__vector_size__(16)));
+
+template<int ShuffleIndex>
+static inline Simd128U8VectT ShufFunc(Simd128U8VectT vect) noexcept {
+ if constexpr(unsigned(ShuffleIndex) >= 16)
+ return Simd128U8VectT { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
+ else if constexpr(ShuffleIndex == 0)
+ return vect;
+ else
+ return __builtin_shufflevector(vect, vect, ShuffleIndex, ShuffleIndex
+ 1,
+ ShuffleIndex + 2, ShuffleIndex + 3, ShuffleIndex + 4, ShuffleIndex
+ 5,
+ ShuffleIndex + 6, ShuffleIndex + 7, ShuffleIndex + 8, ShuffleIndex
+ 9,
+ ShuffleIndex + 10, ShuffleIndex + 11, ShuffleIndex + 12,
ShuffleIndex + 13,
+ ShuffleIndex + 14, ShuffleIndex + 15);
+}
+
+auto func1(Simd128U8VectT vect) noexcept {
+ return ShufFunc<5>(vect);
+}
base-commit: 7c21556daf385fe9ece37319f574776dd7d8ab1c
--
2.35.1
