<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/56807>56807</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Invalid llvm.dbg.declare intrinsic call after instruction combine pass
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          tvivies-amd
      </td>
    </tr>
</table>

<pre>
    For the following IR after running instruction combine pass the operand of the dbg.declare intrinsic call is undef which make the call invalid.
https://godbolt.org/z/qxn97vWrd
```
%struct.Pixel = type { i8, i8, i8 }

declare void @foo(i8* %pixels)

declare void @llvm.dbg.declare(metadata, metadata, metadata)

define dso_local void @toplevel() {
entry:
  %pixels = alloca [500 x %struct.Pixel]
  call void @llvm.dbg.declare(metadata [500 x %struct.Pixel]* %pixels, metadata !11, metadata !DIExpression()), !dbg !12
  %arraydecay = bitcast [500 x %struct.Pixel]* %pixels to i8*
  call void @foo(i8* %arraydecay)
  ret void
}

!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4, !5}
!llvm.ident = !{!6}

!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !1, producer: "clang version 11.1.0", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: None)
!1 = !DIFile(filename: "test.cpp", directory: "")
!2 = !{}
!3 = !{i32 7, !"Dwarf Version", i32 4}
!4 = !{i32 2, !"Debug Info Version", i32 3}
!5 = !{i32 1, !"wchar_size", i32 4}
!6 = !{!"clang version 11.1.0"}
!7 = distinct !DISubprogram(name: "square", linkageName: "_Z6squarei", scope: !1, file: !1, line: 9, type: !8, scopeLine: 9, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
!8 = !DISubroutineType(types: !9)
!9 = !{!10, !10}
!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!11 = !DILocalVariable(name: "num", arg: 1, scope: !7, file: !1, line: 9, type: !10)
!12 = !DILocation(line: 9, column: 16, scope: !7)
!13 = !DILocalVariable(name: "Pixel", scope: !7, file: !1, line: 10, type: !14)
!14 = !DICompositeType(tag: DW_TAG_array_type, baseType: !10, size: 16000, elements: !15)
!15 = !{!16}
!16 = !DISubrange(count: 500)
!17 = !DILocation(line: 10, column: 9, scope: !7)
!18 = !DILocation(line: 12, column: 5, scope: !7)
```
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJyVVt9v4jgQ_mvCi7WRYwiEBx5oWVboql5129uV7gU5sQO-deKs7dB2__ob26FJaBf1JEqxPfPNj29m7Fyxl9VWaWSPHJVKSvUk6gPa_YVoablGuq1rtyFqY3VbWKFqVKgqFzVHDTXG66mGa1ozpEq_ZPkhZryQVHPQsxp0RYEKKiUSBrU14yV6OoriiCr6g3uVcFifqBQsjvAmwuujtY2JpuuIbOFzUCxX0sZKH2D1C_5-PtfLxem7ZkE8muPuE5YkDQ7HD-KZSxRNN8i-NBxFixsksojcvn7D1qZT8t9n109KMBTNcKlURDInvUYA2zg8E5HlNR0pT1U8yAMAVNxSRi11Rt__fYFYuhwzo_ZSQXpeoa1qJD9xCZCg4uIJChwy_eLy5Veod9XHDvkFFBSlNynG6Bld5CdKN2c9T8UH4riKNU5VHyTsJklyubPZfX5uNDcGqiuE5T-37gyMeyUyiItqTV_AI_riY8uFLaixH3YIWeXJX78b8gXdva1XghDS3Hr5jrBx_YC3r2krWu8hbDmeSIJ72U6qUqyVPC4lPZix7LTLwKz7n77RFQxIHyvN3zqDvQQTxoq6sCHft6pqhOR_18JCsJLWh5YeOFQP2nzf363vv-xv941sTfgKLpSg4CQcG27daHC94DrskcKhoBPXjkWUJHESY9j2PWb-bKyoxC_OnHBJpeFuH4YLbPNvQccdYbfNK-FL4Q9Re_ltK-WG5-3BH9ZtZTo3PLhppLD-eFdL4YbVyEZNK_5Ic8nPaPeq5n2vQSznBG52WxchyVygTq0LzHJj46JpumCY0Lywyvca8ntkCEeGfAwImw72xZSgRccqqG-eqC7ROQtdykBkNtSfXeiTgb4LHu3qUr0DMh2CpBcgSQ_yVByp3hvg6HcezMeVdoXygdLineL72uZQOwdNK0j2INHmZ-tHjDcPVP6Akrzvj_f_zIOE6ERMARfPsCIvKxQw_NrPEjf9u8PsVftuKOF70PfAbgs_H7SyymmxUGbb_vjrg1ts3IgW1uf7Fu416KWA76sYZgQFdHavGB8UbF8pWV94kBGtWkgRf3ReksyZPSsth0rLMQnBVPgxyHrX8x77hsLt28EOkg0X8zmNjnPYnJLQX4ViXRPBLFg_foaiONQuCYOeGTTNnbudvlEtXJONbUCrdjao9oDJJW2L_0ObC3bgAxn7EHjIRsqFkm3lBwsMxremB2DTDwUUrpO31Xc1jMDRMI7ZyPSsN-3GsjLCvpYBPfPwuP6y91fR3gMBYE5NEOuT03OZzDEOs1TyCi6Jcy3BJTI0nV5U03xURPNxgUKvO58KBVPbwaV4zMfiKh_Bv56Q5XU-sutgZAyWXgE7vwsnfJXM02WCl5ikE7aasuV0SSdWWMlXu_D0RJfvncv3a3gU_-4xPGm1XF28W4U9tnkMUrBw6N2_TzAB_4V7BJZw2bXQ7GSbzjO8mBxXfFkukqwocZFnGM8IzjLO0mLOZkVKcJlOJM3hGbOC945rMv6EPISry3QzESuCCcELskzS6QLPYpbMFpSWabGcLeAdg-GNwysqZOyDhQf1RK-8S3CLGPfmg2Ft-kOIy_U_9-YAn7b2qPTKnsRJcPOJVmziza-8-_8BpG6BfQ">