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release/19.x: [CodeGen] Clear InitUndef pass new register cache between pass runs (#90967) #110603

Merged
merged 1 commit into from
Oct 1, 2024
Merged

release/19.x: [CodeGen] Clear InitUndef pass new register cache between pass runs (#90967) #110603

merged 1 commit into from
Oct 1, 2024

Commits on Oct 1, 2024

  1. [CodeGen] Clear InitUndef pass new register cache between pass runs (l… 

    …lvm#90967)

Multiple invocations of the pass could interfere with eachother,
preventing some undefs being initialised.

I found it very difficult to create a unit test for this due to it being
dependent on particular allocations of a previous function. However, the
bug can be observed here: https://godbolt.org/z/7xnMo41Gv with the
creation of the illegal instruction `vnsrl.wi v9, v8, 0`
    @joe-img @tru
    joe-img authored and tru committed Oct 1, 2024
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