56cf8b01fe
The bit twiddling in union/intersect for the value/mask pair must be normalized to have the unknown bits with a value of 0 in order to make the math simpler. Normalizing at construction slowed VRP by 1.5% so I opted to normalize before updating the bitmask in range-ops, since it was the only user. However, with upcoming changes there will be multiple setters of the mask (IPA and CCP), so we need something more general. I played with various alternatives, and settled on normalizing before union/intersect which were the ones needing the bits cleared. With this patch, there's no noticeable difference in performance either in VRP or in overall compilation. gcc/ChangeLog: * value-range.cc (irange_bitmask::verify_mask): Mask need not be normalized. * value-range.h (irange_bitmask::union_): Normalize beforehand. (irange_bitmask::intersect): Same. |
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