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[RISCV] Use masked pseudo peephole for reduction pseudos #71508

Merged
merged 1 commit into from
Nov 8, 2023
Merged

[RISCV] Use masked pseudo peephole for reduction pseudos #71508

merged 1 commit into from
Nov 8, 2023

Commits on Nov 7, 2023

  1. [RISCV] Use masked pseudo peephole for reduction pseudos 

    After llvm#71483 we now have a way of marking masked pseudos as having an unmasked
equivalent, but their mask shouldn't be folded unless it's all ones since it
would affect the result.

This patch uses it to mark the pseudos for vredsum and friends, which in turn
allows us to remove the unmasked patterns and remove vmerges entirely if it's
known to have an all ones mask.
    @lukel97
    lukel97 committed Nov 7, 2023
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