================
@@ -0,0 +1,92 @@
+// RUN: %clang_cc1 -fsyntax-only -verify -std=c++14 -triple
x86_64-unknown-unknown %s
+// RUN: %clang_cc1 -fsyntax-only -verify -std=c++14 -triple
x86_64-unknown-unknown %s -fexperimental-new-constant-interpreter
+
+constexpr bool test_constexpr_valid() {
+ constexpr int arr[10] = {};
+ __builtin_assume_dereferenceable(arr, 40);
+ return true;
+}
+static_assert(test_constexpr_valid(), "");
+
+constexpr bool test_constexpr_partial() {
+ constexpr int arr[10] = {};
+ __builtin_assume_dereferenceable(&arr[5], 20);
+ return true;
+}
+static_assert(test_constexpr_partial(), "");
+
+constexpr bool test_constexpr_nullptr() { // expected-error {{constexpr
function never produces a constant expression}}
+ __builtin_assume_dereferenceable(nullptr, 4); // expected-note 2{{read of
dereferenced null pointer is not allowed in a constant expression}}
+ return true;
+}
----------------
chaitanyav wrote:
"Note that this does not necessarily imply that P is non-null as nullptr can be
dereferenced in some cases. "
https://clang.llvm.org/docs/LanguageExtensions.html#builtin-assume-dereferenceable.
https://github.com/llvm/llvm-project/pull/169869
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