[cfe-dev] constexpr with builtin

[fil]

CLANG 3.2, just wondering if anyone can explain:

inline constexpr uint8_t test(uint64_t value)
{
	return value == 0 ? 0: __builtin_clzll(value);
}

Result: /Constexpr function never produces a constant expression/

While this compiles fine:

inline constexpr uint8_t test(uint64_t value)
{
	return value == value ? __builtin_clzll(value) : 0;
}

Any ideas?



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