@@ -497,6 +497,17 @@ const svalue *
region_model_manager::get_or_create_cast (tree type, const svalue *arg)
{
gcc_assert (type);
+
+ /* No-op if the types are the same. */
+ if (type == arg->get_type ())
+ return arg;
+
+ /* Don't attempt to handle casts involving vector types for now. */
+ if (TREE_CODE (type) == VECTOR_TYPE
+ || (arg->get_type ()
+ && TREE_CODE (arg->get_type ()) == VECTOR_TYPE))
+ return get_or_create_unknown_svalue (type);
+
enum tree_code op = get_code_for_cast (type, arg->get_type ());
return get_or_create_unaryop (type, op, arg);
}
new file mode 100644
@@ -0,0 +1,18 @@
+/* { dg-additional-options "-Wno-analyzer-use-of-uninitialized-value" } */
+
+typedef int __attribute__((__vector_size__(4))) T;
+typedef unsigned __attribute__((__vector_size__(4))) U;
+typedef unsigned __attribute__((__vector_size__(16))) V;
+typedef unsigned long __attribute__((__vector_size__(16))) W;
+
+U u;
+T t;
+
+void
+foo(W w) {
+ U u = __builtin_shufflevector((V)w, u, 0);
+ t = (T){} + u + u;
+ foo((W){});
+ for (;;)
+ ;
+}
PR analyzer/104159 describes an ICE attempting to convert a vector_cst, which occurs when symbolically executing within a recursive call on: _4 = BIT_FIELD_REF <w_3(D), 32, 0>; _1 = VIEW_CONVERT_EXPR<T>(_4); where the BIT_FIELD_REF leads to a get_or_create_cast from VEC<long, 8> to VEC<unsigned 4> which get_code_for_cast erroneously picks NOP_EXPR for the cast, leading to a bogus input to the VIEW_CONVERT_EXPR. This patch fixes the issue by giving up on attempts to cast symbolic values of vector types, treating the result of such casts as unknowable. Successfully bootstrapped & regrtested on x86_64-pc-linux-gnu. Pushed to trunk as r12-6817-g45b999f642a531c083c982dda79fa6ad65730a7c. gcc/analyzer/ChangeLog: PR analyzer/104159 * region-model-manager.cc (region_model_manager::get_or_create_cast): Bail out if the types are the same. Don't attempt to handle casts involving vector types. gcc/testsuite/ChangeLog: PR analyzer/104159 * gcc.dg/analyzer/torture/pr104159.c: New test. Signed-off-by: David Malcolm <dmalcolm@redhat.com> --- gcc/analyzer/region-model-manager.cc | 11 +++++++++++ .../gcc.dg/analyzer/torture/pr104159.c | 18 ++++++++++++++++++ 2 files changed, 29 insertions(+) create mode 100644 gcc/testsuite/gcc.dg/analyzer/torture/pr104159.c