[llvm] AMDGPU: Add debug print to load/store opt for agpr case (PR #155767)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-amdgpu

Author: Matt Arsenault (arsenm)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/155767.diff


1 Files Affected:

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


``````````diff
diff --git a/llvm/lib/Target/AMDGPU/SILoadStoreOptimizer.cpp b/llvm/lib/Target/AMDGPU/SILoadStoreOptimizer.cpp
index 6f2ea8ad1ff01..263f7127fbf10 100644
--- a/llvm/lib/Target/AMDGPU/SILoadStoreOptimizer.cpp
+++ b/llvm/lib/Target/AMDGPU/SILoadStoreOptimizer.cpp
@@ -2466,6 +2466,9 @@ SILoadStoreOptimizer::collectMergeableInsts(
       continue;
 
     if (CI.InstClass == DS_WRITE && CI.IsAGPR) {
+      LLVM_DEBUG(
+          dbgs() << "cannot merge ds writes with mixed AGPR and VGPR data\n");
+
       // FIXME: nothing is illegal in a ds_write2 opcode with two AGPR data
       //        operands. However we are reporting that ds_write2 shall have
       //        only VGPR data so that machine copy propagation does not

``````````

</details>


https://github.com/llvm/llvm-project/pull/155767