[all-commits] [llvm/llvm-project] bcf047: [ARM][PowerPC] Add regression tests for narrowing ...

[Björn Pettersson via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: bcf047a4ed9afc49f851156698a6d277ab2c00ea
      https://github.com/llvm/llvm-project/commit/bcf047a4ed9afc49f851156698a6d277ab2c00ea
  Author: Bjorn Pettersson <bjorn.a.pettersson at ericsson.com>
  Date:   2024-04-12 (Fri, 12 Apr 2024)

  Changed paths:
    A llvm/test/CodeGen/ARM/simplifysetcc_narrow_load.ll
    A llvm/test/CodeGen/PowerPC/simplifysetcc_narrow_load.ll

  Log Message:
  -----------
  [ARM][PowerPC] Add regression tests for narrowing load in TargetLowering::SimplifySetCC

These test cases show some miscomplies for big-endian when dealing
with non byte-sized loads. One part of the problem is that LLVM IR
isn't really telling where the padding goes for non byte-sized
loads/stores. So currently TargetLowering::SimplifySetCC can't assume
anything about it. But the implementation also do not consider that
the TypeStoreSize could be larger than the TypeSize, resulting in
the offset calculation being wrong for big-endian.

Pre-commit for https://github.com/llvm/llvm-project/pull/87646



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