[llvm] [AMDGPU][CodeGen] SILowerWWMCopies: Declare used analyses (PR #123710)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-amdgpu

Author: Akshat Oke (optimisan)

<details>
<summary>Changes</summary>

This prevents legacy PM from mistakenly removing these analyses if `SILowerWWMCopies` is the last user of them. (it removes dead analyses after its last use)

---
Full diff: https://github.com/llvm/llvm-project/pull/123710.diff


1 Files Affected:

- (modified) llvm/lib/Target/AMDGPU/SILowerWWMCopies.cpp (+3) 


``````````diff
diff --git a/llvm/lib/Target/AMDGPU/SILowerWWMCopies.cpp b/llvm/lib/Target/AMDGPU/SILowerWWMCopies.cpp
index c663820311b8ce..d80a5f958273a9 100644
--- a/llvm/lib/Target/AMDGPU/SILowerWWMCopies.cpp
+++ b/llvm/lib/Target/AMDGPU/SILowerWWMCopies.cpp
@@ -43,6 +43,9 @@ class SILowerWWMCopies : public MachineFunctionPass {
   StringRef getPassName() const override { return "SI Lower WWM Copies"; }
 
   void getAnalysisUsage(AnalysisUsage &AU) const override {
+    AU.addUsedIfAvailable<LiveIntervalsWrapperPass>();
+    AU.addUsedIfAvailable<SlotIndexesWrapperPass>();
+    AU.addUsedIfAvailable<VirtRegMapWrapperLegacy>();
     AU.setPreservesAll();
     MachineFunctionPass::getAnalysisUsage(AU);
   }

``````````

</details>


https://github.com/llvm/llvm-project/pull/123710