[all-commits] [llvm/llvm-project] f64d1c: [RISCV] Add test cases for folding disjoint Or int...

[Craig Topper via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: f64d1c810a2b8d89c3760cefb957da499c087404
      https://github.com/llvm/llvm-project/commit/f64d1c810a2b8d89c3760cefb957da499c087404
  Author: Craig Topper <craig.topper at sifive.com>
  Date:   2024-01-03 (Wed, 03 Jan 2024)

  Changed paths:
    M llvm/test/CodeGen/RISCV/mem.ll

  Log Message:
  -----------
  [RISCV] Add test cases for folding disjoint Or into a scalar load address. NFC

After 47a1704ac94c8aeb1aa7e0fc438ff99d36b632c6 we are able to
reassociate a disjoint Or used as a GEP index to get the constant
closer to a load to fold it. This is show by the first test.

We are not able to do this if the GEP created a shift left to scale
the index as the second test shows.

To make this work, we need to preserve the disjoint flag when pulling
the Or through the shift.