[llvm] [X86] combineConstantPoolLoads - correctly merge constant pool loads by pointer and chain (PR #139575)

Mon May 12 09:20:49 PDT 2025

https://github.com/RKSimon created https://github.com/llvm/llvm-project/pull/139575

We were merging with a larger constant pool load if it didn't have any chain dependencies (and implicitly assuming all uses were on the vector value), instead we should flip this, explicitly check for uses of the vector value and merge the memory chain dependencies with makeEquivalentMemoryOrdering.

As these are constant pool loads we shouldn't expect any changes here, but we should be consistent with how we merge/reuse loads - an upcoming patch for other loads will do the same as we will see changes there.

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