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d3139f2f0a
These instructions shift left or right depending on the sign of the input, and 7 bits are significant to the shift. This requires several masks and selects in addition to the actual shifts to form the complete answer. That said, the operation is still a small improvement even for two 64-bit elements -- 13 vector operations instead of 2 * 7 integer operations. Backports commit 87b74e8b6edd287ea2160caa0ebea725fa8f1ca1 from qemu |
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