[llvm] [AMDGPU][SIInsertWaitCnts] Gfx12.5 - Refactor xcnt optimization (PR #164357)

[Ryan Mitchell via llvm-commits]

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@@ -1069,6 +1069,51 @@ body: |
     $sgpr0 = S_MOV_B32 $sgpr0
 ...
 
+---
+name: mixed_pending_events
+tracksRegLiveness: true
+machineFunctionInfo:
+  isEntryFunction: true
+body: |
+  ; GCN-LABEL: name: mixed_pending_events
+  ; GCN: bb.0:
+  ; GCN-NEXT:   successors: %bb.2(0x40000000), %bb.1(0x40000000)
+  ; GCN-NEXT:   liveins: $vgpr0_vgpr1, $sgpr0_sgpr1, $scc
+  ; GCN-NEXT: {{  $}}
+  ; GCN-NEXT:   $sgpr2 = S_LOAD_DWORD_IMM $sgpr0_sgpr1, 0, 0
+  ; GCN-NEXT:   S_CBRANCH_SCC1 %bb.2, implicit $scc
+  ; GCN-NEXT: {{  $}}
+  ; GCN-NEXT: bb.1:
+  ; GCN-NEXT:   successors: %bb.2(0x80000000)
+  ; GCN-NEXT:   liveins: $vgpr0_vgpr1, $sgpr2
+  ; GCN-NEXT: {{  $}}
+  ; GCN-NEXT:   $vgpr2 = GLOBAL_LOAD_DWORD $vgpr0_vgpr1, 0, 0, implicit $exec
+  ; GCN-NEXT:   $vgpr3 = GLOBAL_LOAD_DWORD $vgpr0_vgpr1, 0, 0, implicit $exec
+  ; GCN-NEXT: {{  $}}
+  ; GCN-NEXT: bb.2:
+  ; GCN-NEXT:   liveins: $sgpr2, $vgpr2
+  ; GCN-NEXT: {{  $}}
+  ; GCN-NEXT:   S_WAIT_LOADCNT 1
+  ; GCN-NEXT:   $vgpr2 = V_MOV_B32_e32 $vgpr2, implicit $exec
+  ; GCN-NEXT:   S_WAIT_KMCNT 0
+  ; GCN-NEXT:   $sgpr2 = S_MOV_B32 $sgpr2
+  ; GCN-NEXT:   S_WAIT_XCNT 0
----------------
RyanRio wrote:

Ah are you saying that waiting for the first global load would also handle any hazard on modifying the address source for the second load?

https://github.com/llvm/llvm-project/pull/164357