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For targets that set the "extended" flag in TARGET_C_BITINT_TYPE_INFO, we assume small _BitInts to be internally extended after arithmetic operations. In this case, an extra extension during RTL expansion can be avoided. * expr.cc (expand_expr_real_1): Do not call reduce_to_bit_field_precision if the target assumes the _BitInt results to be already extended. (EXTEND_BITINT): Same. * expr.h (bitint_extended): Declare the cache variable. * function.cc (prepare_function_start): Initialize it.
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