[llvm] [AMDGPU] Skip debug instructions in SIShrinkInstructions::matchSwap (PR #160123)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-amdgpu

Author: Jay Foad (jayfoad)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/160123.diff


2 Files Affected:

- (modified) llvm/lib/Target/AMDGPU/SIShrinkInstructions.cpp (+2) 
- (modified) llvm/test/CodeGen/AMDGPU/v_swap_b32.mir (+1) 


``````````diff
diff --git a/llvm/lib/Target/AMDGPU/SIShrinkInstructions.cpp b/llvm/lib/Target/AMDGPU/SIShrinkInstructions.cpp
index 7a519117f2482..4f0e6d07208e6 100644
--- a/llvm/lib/Target/AMDGPU/SIShrinkInstructions.cpp
+++ b/llvm/lib/Target/AMDGPU/SIShrinkInstructions.cpp
@@ -733,6 +733,8 @@ MachineInstr *SIShrinkInstructions::matchSwap(MachineInstr &MovT) const {
     MachineInstr *MovX = nullptr;
     for (auto IY = MovY->getIterator(), I = std::next(MovT.getIterator());
          I != IY; ++I) {
+      if (I->isMetaInstruction())
+        continue;
       if (instReadsReg(&*I, X, Xsub) || instModifiesReg(&*I, Y, Ysub) ||
           instModifiesReg(&*I, T, Tsub) ||
           (MovX && instModifiesReg(&*I, X, Xsub))) {
diff --git a/llvm/test/CodeGen/AMDGPU/v_swap_b32.mir b/llvm/test/CodeGen/AMDGPU/v_swap_b32.mir
index 95aaea6ea8091..27229cd518028 100644
--- a/llvm/test/CodeGen/AMDGPU/v_swap_b32.mir
+++ b/llvm/test/CodeGen/AMDGPU/v_swap_b32.mir
@@ -1,4 +1,5 @@
 # RUN: llc -simplify-mir -mtriple=amdgcn -mcpu=gfx900 -run-pass=si-shrink-instructions -verify-machineinstrs %s -o - | FileCheck -check-prefix=GCN %s
+# RUN: llc -simplify-mir -mtriple=amdgcn -mcpu=gfx900 -run-pass=si-shrink-instructions -verify-machineinstrs %s -o - -debugify-and-strip-all-safe | FileCheck -check-prefix=GCN %s
 # RUN: llc -simplify-mir -mtriple=amdgcn -mcpu=gfx900 -passes=si-shrink-instructions -verify-machineinstrs %s -o - | FileCheck -check-prefix=GCN %s
 
 # GCN-LABEL: name: swap_phys_condensed

``````````

</details>


https://github.com/llvm/llvm-project/pull/160123