Commit 39fca95053926d63f2ffed3dd64dc41a7d35b767
2016-08-30T12:29:21
intprops: tune INT_NEGATE_OVERFLOW for GCC 5 and 6 * lib/intprops.h (INT_NEGATE_OVERFLOW): Tune for platforms like GCC 5 and 6 that have __builtin_sub_overflow but not __builtin_sub_overflow_p. With the recent changes, these platforms are a tiny bit faster with the INT_NEGATE_RANGE_OVERFLOW implementation than with INT_SUBTRACT_OVERFLOW implementation, since the former needs just one runtime comparison whereas the latter needs two.