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Because we may be able to use the other side's storage and apply the operation in-place. We reuse the storage of the one that can be detached: even if we have to grow the buffer, QBitArrays are usually small so there's a good chance it's just to the extra space QArrayData usually overallocates or a simple, non-moving realloc(). Disassembly with GCC 13 and Clang 17 show the vectorisers did kick in for all four functions (inverted_inplace included). I think a hand-rolled version could squeeze a few more cycles, especially in the tail section, but I don't consider its maintenance cost to be worth it. Pick-to: 6.7 Change-Id: I85b3fc2dd45c4693be13fffd1795bfb1b296caa6 Reviewed-by: Marc Mutz <marc.mutz@qt.io> |
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| .gitignore | ||
| CMakeLists.txt | ||
| tst_qbitarray.cpp | ||