File: missing-store.ll

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llvm-toolchain-16 1%3A16.0.6-15~deb12u1
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; RUN: llc -march=amdgcn -mcpu=tahiti -verify-machineinstrs < %s | FileCheck -check-prefix=FUNC -check-prefix=SI %s

@ptr_load = addrspace(3) global ptr addrspace(4) undef, align 8

; Make sure when the load from %ptr2 is folded the chain isn't lost,
; resulting in losing the store to gptr

; FUNC-LABEL: {{^}}missing_store_reduced:
; SI:     s_load_dwordx4
; SI-DAG: ds_read_b64
; SI-DAG: v_readfirstlane_b32 s[[PTR_LO:[0-9]+]], v{{[0-9]+}}
; SI-DAG: v_readfirstlane_b32 s[[PTR_HI:[0-9]+]], v{{[0-9]+}}
; SI-DAG: s_load_dword s{{[0-9]+}}, s[[[PTR_LO]]:[[PTR_HI]]]
; SI-DAG: buffer_store_dword
; SI-DAG: buffer_store_dword
; SI:     s_endpgm
define amdgpu_kernel void @missing_store_reduced(ptr addrspace(1) %out, ptr addrspace(1) %gptr) #0 {
  %ptr0 = load ptr addrspace(4), ptr addrspace(3) @ptr_load, align 8
  %ptr2 = getelementptr inbounds i32, ptr addrspace(4) %ptr0, i64 2

  store i32 99, ptr addrspace(1) %gptr, align 4
  %tmp2 = load i32, ptr addrspace(4) %ptr2, align 4

  store i32 %tmp2, ptr addrspace(1) %out, align 4
  ret void
}

attributes #0 = { nounwind }