[llvm] [VN] be more consistent about forwarding null inputs and ignoring SVE outputs (PR #139574)
Jameson Nash via llvm-commits
llvm-commits at lists.llvm.org
Mon May 12 09:12:53 PDT 2025
https://github.com/vtjnash created https://github.com/llvm/llvm-project/pull/139574
Many callers of canCoerceMustAliasedValueToLoad were duplicating checks that should have already been handled by isFirstClassAggregate, and were therefore inconsistent about whether they would handle the zeroinitializer case. Instead, try to ensure all users handle the zeroinitializer specifically and consistently, so that non-integral pointers aren't the only case that gets optimized. And also avoids relying on the constant folder to legalize the insertion of `(ptrtoint (ptr addrspace(NI) zeroinitializer) to isize)` (or similar such vectors or also now arrays of the same).
Several callers were also noticed to be relying on canCoerceMustAliasedValueToLoad to reject all ScalableVectors (since they immediately tried to call getFixedValue on the type afterwards), but they needed to bail first. This shouldn't be a functional change in a release build (since it checked for SVE immediately afterward), but may avoid an assert in debugging. It also might be a future opportunity for improvement (since in some cases, it may not actually need the size explicitly, but just to check that the sizes are compatible).
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