| commit | f40001372b54ce68507f36b600f798e832478e16 | [log] [tgz] |
|---|---|---|
| author | Philip Reames <preames@rivosinc.com> | Thu Apr 10 19:45:04 2025 -0700 |
| committer | GitHub <noreply@github.com> | Thu Apr 10 19:45:04 2025 -0700 |
| tree | 5e559c174eaafda9134d5dfb3cf9850872819de5 | |
| parent | b03aa291b8ddc962ff82859b5317d8ea8a7a3e87 [diff] |
[RISCV] Lower a shuffle which is nearly identity except one replicated element (#135292) This can be done with a vrgather.vi/vx, and (possibly) a register move. The alternative is to do a vrgather.vv with a full width index vector. We'd already caught the two operands forms of this shuffle; this patch specifically handles the single operand form. Unfortunately only in abstract, it would be nice if we canonicalized shuffles in some way wouldn't it?
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