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In LoongArch psABI, large _BitInt(N) (N > 64) objects are only extended to fill the highest 8-byte chunk that contains any used bit, but the size of such a large _BitInt type is a multiple of their 16-byte alignment. So there may be an entire unused 8-byte chunk that is not filled by extension, and this chunk shouldn't be checked when testing if the object is properly extended. The original bitintext.h assumed that all bits within sizeof(_BitInt(N)) beyond used bits are filled by extension. This patch changes that for LoongArch and possibly any future ports with a similar behavior. P.S. For encoding this test as well as type-generic programming, it would be nice to have a builtin function to obtain "N" at compile time from _BitInt(N)-typed expressions. But here we stick to existing ones (__builtin_clrsbg / __builtin_clzg). * gcc.dg/bitintext.h (S, CEIL, PROMOTED_SIZE): Define. (BEXTC): Generalize to only check extension within PROMOTED_SIZE bits.
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