[AMDGPU] Skip debug instructions when eliminating S_SET_GPR_IDX_ON/OFF

Author: jayfoad

llvm/lib/Target/AMDGPU/SIPreEmitPeephole.cpp

@@ -299,7 +299,7 @@ bool SIPreEmitPeephole::optimizeSetGPR(MachineInstr &First,
   for (MachineBasicBlock::instr_iterator I = std::next(First.getIterator()),
                                          E = MI.getIterator();
        I != E; ++I) {
-    if (I->isBundle())
+    if (I->isBundle() || I->isDebugInstr())
       continue;
     switch (I->getOpcode()) {
     case AMDGPU::S_SET_GPR_IDX_MODE:

llvm/test/CodeGen/AMDGPU/set-gpr-idx-peephole.mir

@@ -1,5 +1,6 @@
 # NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
 # RUN: llc -mtriple=amdgcn -mcpu=gfx900 -run-pass si-pre-emit-peephole -verify-machineinstrs -o - %s | FileCheck -check-prefix=GCN %s -implicit-check-not=S_SET_GPR_IDX
+# RUN: llc -mtriple=amdgcn -mcpu=gfx900 -run-pass si-pre-emit-peephole -verify-machineinstrs -o - %s -debugify-and-strip-all-safe | FileCheck -check-prefix=GCN %s -implicit-check-not=S_SET_GPR_IDX
 # RUN: llc -mtriple=amdgcn -mcpu=gfx900 -passes si-pre-emit-peephole -o - %s | FileCheck -check-prefix=GCN %s -implicit-check-not=S_SET_GPR_IDX
 
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