================
@@ -0,0 +1,309 @@
+// RUN: %clang_cc1 -fexperimental-new-constant-interpreter -verify -std=c++20
%s
+// RUN: %clang_cc1 -verify -std=c++20 %s
+
+
+
+static_assert(__builtin_nearbyint(1.1) == 1.0);
+static_assert(__builtin_nearbyint(1.9) == 2.0);
+static_assert(__builtin_nearbyint(-1.1) == -1.0);
+static_assert(__builtin_nearbyint(-1.9) == -2.0);
+
+static_assert(__builtin_nearbyintf(1.1f) == 1.0f);
+static_assert(__builtin_nearbyintl(1.1l) == 1.0l);
+static_assert(__builtin_nearbyintf16(1.1f16) == 1.0f16);
+static_assert(__builtin_nearbyintf128(1.1) == 1.0);
+static_assert(__builtin_isnan(__builtin_nearbyint(__builtin_nan(""))));
+static_assert(__builtin_isinf(__builtin_nearbyint(__builtin_inf())));
+
+// Test ties to even (default rounding mode)
+static_assert(__builtin_nearbyint(1.5) == 2.0);
+static_assert(__builtin_nearbyint(2.5) == 2.0);
+
+// rint tests
+static_assert(__builtin_rint(1.1) == 1.0);
+static_assert(__builtin_rint(1.9) == 2.0);
+static_assert(__builtin_rintf(1.1f) == 1.0f);
+static_assert(__builtin_rintl(1.1l) == 1.0l);
+static_assert(__builtin_rintf16(1.1f16) == 1.0f16);
+static_assert(__builtin_rintf128(1.1) == 1.0);
+static_assert(__builtin_isnan(__builtin_rint(__builtin_nan(""))));
+static_assert(__builtin_isinf(__builtin_rint(__builtin_inf())));
+
+// lrint tests
+static_assert(__builtin_lrint(1.1) == 1);
+static_assert(__builtin_lrint(1.9) == 2);
+static_assert(__builtin_lrintf(1.1f) == 1);
+static_assert(__builtin_lrintl(1.1l) == 1);
+static_assert(__builtin_lrintf128(1.1) == 1);
+
+// llrint tests
+static_assert(__builtin_llrint(1.1) == 1LL);
+static_assert(__builtin_llrint(1.9) == 2LL);
+static_assert(__builtin_llrintf(1.1f) == 1LL);
+static_assert(__builtin_llrintl(1.1l) == 1LL);
+static_assert(__builtin_llrintf128(1.1) == 1LL);
----------------
hubert-reinterpretcast wrote:
These functions have what https://wg21.link/p0533 calls "strong rounding mode
dependence" and are not `constexpr` in C++26. To my knowledge, these builtins
are also not considered `constexpr` by GCC.
I recommend removing the changes for these functions from this PR.
https://github.com/llvm/llvm-project/pull/194327
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