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[clang] Add regression tests for narrowing with is_constant_evaluated. #142885

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Merged
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Jun 5, 2025
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[clang] Add regression tests for narrowing with is_constant_evaluated. #142885

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11 changes: 11 additions & 0 deletions clang/test/SemaCXX/builtin-is-constant-evaluated.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -143,3 +143,14 @@ namespace fold_initializer {
const float A::f = __builtin_is_constant_evaluated();
static_assert(fold(A::f == 1.0f));
}

namespace narrowing {
struct X { unsigned u; };
constexpr int f(X x) {return x.u;}
void g() {
static_assert(f({0xFFFFFFFFLL + __builtin_is_constant_evaluated()}) == 0);
f({0x100000000LL - __builtin_is_constant_evaluated()}); // expected-error {{constant expression evaluates to 4294967296}} \
// expected-warning {{implicit conversion}} \
// expected-note {{insert an explicit cast to silence this issue}}
}
}
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