[llvm] [AMDGPU] Track LDS DMA VGPR source reads in expert scheduling (PR #203292)

[Austin Kerbow via llvm-commits]

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@@ -27,3 +27,79 @@ body: |
     $vgpr64 = GLOBAL_LOAD_DWORD $vgpr16_vgpr17, 0, 0, implicit $exec
     $vgpr64 = GLOBAL_LOAD_DWORD $vgpr40_vgpr41, 0, 0, implicit $exec
 ...
+
+---
+name: async_global_to_lds_vaddr_vsrc_war
+tracksRegLiveness: true
+machineFunctionInfo:
+  isEntryFunction: true
+body: |
+  bb.0:
+    liveins: $vgpr0, $vgpr1, $vgpr2
+    ; CHECK-LABEL: name: async_global_to_lds_vaddr_vsrc_war
+    ; CHECK: liveins: $vgpr0, $vgpr1, $vgpr2
+    ; CHECK-NEXT: {{  $}}
+    ; CHECK-NEXT: S_SETREG_IMM32_B32 2, 2074, implicit-def $mode, implicit $mode
+    ; CHECK-NEXT: GLOBAL_LOAD_ASYNC_TO_LDS_B32 $vgpr2, $vgpr0_vgpr1, 0, 0, implicit-def $asynccnt, implicit $exec, implicit $asynccnt :: (load (s32), addrspace 1), (store (s32), addrspace 3)
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kerbowa wrote:

Do we need a wait here?

https://github.com/llvm/llvm-project/pull/203292