[llvm] [AMDGPU] Change SGPR layout to striped caller/callee saved (PR #127353)

[via llvm-commits]

github-actions[bot] wrote:

<!--LLVM CODE FORMAT COMMENT: {undef deprecator}-->


:warning: undef deprecator found issues in your code. :warning:

<details>
<summary>
You can test this locally with the following command:
</summary>

``````````bash
git diff -U0 --pickaxe-regex -S '([^a-zA-Z0-9#_-]undef[^a-zA-Z0-9_-]|UndefValue::get)' d08cf7900d2aaff9e7483ea74a58871edbdc45f2 1bde981f60a8014728012b4b19dd73072a41bd48 llvm/test/CodeGen/AMDGPU/amdgpu-simplify-libcall-pow-codegen.ll llvm/test/CodeGen/AMDGPU/bf16.ll llvm/test/CodeGen/AMDGPU/blender-no-live-segment-at-def-implicit-def.ll llvm/test/CodeGen/AMDGPU/branch-folding-implicit-def-subreg.ll llvm/test/CodeGen/AMDGPU/branch-relax-spill.ll llvm/test/CodeGen/AMDGPU/call-args-inreg-no-sgpr-for-csrspill-xfail.ll llvm/test/CodeGen/AMDGPU/call-args-inreg.ll llvm/test/CodeGen/AMDGPU/call-argument-types.ll llvm/test/CodeGen/AMDGPU/call-preserved-registers.ll llvm/test/CodeGen/AMDGPU/callee-frame-setup.ll llvm/test/CodeGen/AMDGPU/ds_read2.ll llvm/test/CodeGen/AMDGPU/dwarf-multi-register-use-crash.ll llvm/test/CodeGen/AMDGPU/function-args-inreg.ll llvm/test/CodeGen/AMDGPU/function-resource-usage.ll llvm/test/CodeGen/AMDGPU/gfx-call-non-gfx-func.ll llvm/test/CodeGen/AMDGPU/gfx-callable-argument-types.ll llvm/test/CodeGen/AMDGPU/global_atomics_scan_fadd.ll llvm/test/CodeGen/AMDGPU/global_atomics_scan_fmax.ll llvm/test/CodeGen/AMDGPU/global_atomics_scan_fmin.ll llvm/test/CodeGen/AMDGPU/global_atomics_scan_fsub.ll llvm/test/CodeGen/AMDGPU/identical-subrange-spill-infloop.ll llvm/test/CodeGen/AMDGPU/indirect-call.ll llvm/test/CodeGen/AMDGPU/llvm.amdgcn.readfirstlane.ll llvm/test/CodeGen/AMDGPU/llvm.maximum.f32.ll llvm/test/CodeGen/AMDGPU/llvm.maximum.f64.ll llvm/test/CodeGen/AMDGPU/llvm.minimum.f32.ll llvm/test/CodeGen/AMDGPU/llvm.minimum.f64.ll llvm/test/CodeGen/AMDGPU/machine-sink-temporal-divergence-swdev407790.ll llvm/test/CodeGen/AMDGPU/materialize-frame-index-sgpr.gfx10.ll llvm/test/CodeGen/AMDGPU/materialize-frame-index-sgpr.ll llvm/test/CodeGen/AMDGPU/mcexpr-knownbits-assign-crash-gh-issue-110930.ll llvm/test/CodeGen/AMDGPU/promote-constOffset-to-imm.ll llvm/test/CodeGen/AMDGPU/schedule-amdgpu-tracker-physreg.ll llvm/test/CodeGen/AMDGPU/select.f16.ll llvm/test/CodeGen/AMDGPU/shufflevector.v2i64.v8i64.ll llvm/test/CodeGen/AMDGPU/sibling-call.ll llvm/test/CodeGen/AMDGPU/spill_more_than_wavesize_csr_sgprs.ll llvm/test/CodeGen/AMDGPU/stack-realign.ll llvm/test/CodeGen/AMDGPU/tuple-allocation-failure.ll llvm/test/CodeGen/AMDGPU/unstructured-cfg-def-use-issue.ll llvm/test/CodeGen/AMDGPU/vgpr-large-tuple-alloc-error.ll
``````````

</details>


The following files introduce new uses of undef:
 - llvm/test/CodeGen/AMDGPU/tuple-allocation-failure.ll

[Undef](https://llvm.org/docs/LangRef.html#undefined-values) is now deprecated and should only be used in the rare cases where no replacement is possible. For example, a load of uninitialized memory yields `undef`. You should use `poison` values for placeholders instead.

In tests, avoid using `undef` and having tests that trigger undefined behavior. If you need an operand with some unimportant value, you can add a new argument to the function and use that instead.

For example, this is considered a bad practice:
```llvm
define void @fn() {
  ...
  br i1 undef, ...
}
```

Please use the following instead:
```llvm
define void @fn(i1 %cond) {
  ...
  br i1 %cond, ...
}
```

Please refer to the [Undefined Behavior Manual](https://llvm.org/docs/UndefinedBehavior.html) for more information.



https://github.com/llvm/llvm-project/pull/127353