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In each 128-lane, if there is at least one index is demanded and not all indices are demanded and this 128-lane is not the first 128-lane of the legalized-vector, then this 128-lane needs a extracti128; If in each 128-lane, there is at least one index is demanded, this 128-lane needs a inserti128. The following cases will help you build a better understanding: Assume we insert several elements into a v8i32 vector in avx2, Case#1: inserting into 1th index needs vpinsrd + inserti128 Case#2: inserting into 5th index needs extracti128 + vpinsrd + inserti128 Case#3: inserting into 4,5,6,7 index needs 4*vpinsrd + inserti128. Reviewed By: pengfei, RKSimon Differential Revision: https://reviews.llvm.org/D89767 |
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