<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=http://email.email.llvm.org/c/eJzFWllv4zgS_jXOC2FBh3U95CHnTIBkE0yymcG-GJRE2dzQkiBSSdy_fqtIWRaVszvZmYZbtnjU91WxyCqSyepie3hB1vSREUoUk4rkVLKZf0Ke1jxfk5JyIckTV2tyeXl_RTwf67JOkae6fbBqAkKrggiqWOuQP5kRmndS1RvWStJJXq12QkhG8wdWFShM1uSJkYqxAiiU_JmUdbtr55ALAOoEVDVNy3IO0smaiYbwglWKl1sUqtYAVG82XGkKeUtLtStvqEI1LJEFo0JsEZuX0IhLAh9RP81bLh9MD20BRuRag2tVQDrhFUpwHZ90TYFcZn4CMria-bEkq1qj1tC-aVg181Nn5p7O3CPz_HNkRc0NjQu4NdiRSuAogIOcBUfjTrPI7T_mNTgjQuQwAqsG0NS8ZUWXs2Iu-aYRvOSscIQg803edLPgdE3lExPC9IV-IBwon4s6p6IAZWE0z4ttRrP6gWO5eNz0X3PUc1TEM3ie1AX7DRU7v2WC5YrX1enRb5NXJ28awFnEboxwWgDoFBzdnt5T0bFxyViKLlkx9S8AAbN2leSrCpwCtMTRyOsKvHMs7bLOQZkIK_fFZ_d3dkGP-roIxDoXdCVhrJDskZSsRUIELe4nM9-7v3O4vAeadasLUjKLT-BDoALYmpozwTbgjyd1h2RNq-AUPuS6YS04pW6KPO62DTMt3uutBaBqEXz5phVhphmoAe3IhsuN8VQPmoD_aXeC4TeDfXN5dnR7RmSX6WmBDkNa1tSt0g6qVKM9zT-HD9RJB83i1O0K3vUs4lUuuoKZydVSudZzVrU0Zz3ErYICUnSbZvBZ1yH6301br1q6IbRddchZGk_4Nb_1eqF_dFWFE6yhUoJZ4vOu0s5DbrDgilZ0xVo0BBRt6qITOD3j9xGhQa-N_wbKX0lEwD3nMPPgi1yAC7WdwR3ctwctd4TgfbZws-Vy-bgtHrcc3zUI1AQucZ_d3T8vZ0mUBiOnlFtpfty0wFrb-A6NDo6xb9TSp2UNRBjd9DNAzxJ0muTj-Z3xaje94acuz2f-sfvcs0EHHOh6E7pRULDX6ILdbmHCUvE7eI-AFX83D77KCAEtRv7UgFlYEgsbV-XvsgcIt9CDHj0uAzfLfbYIcpcsly3EzrplS5hfPaZeMZ-TaBkt5oJX3fN8VXWmolFrGLrCkTWCIlAIUiyYxRgmK-LESzLSUi7RqWHGcgHB83wFwvI5-8tTV8fDq-8EsCScS20R-OE4-LaVBYM578Os4c-m4FGzAWbwrUU7GCBCDx7enkloMwnjJEwJWFBr-jkmqjDW0L00SIIgo0kRTUFiGDxYIJeG91KyFa4jy0cdQT6JCz4g9OjTYiNXOTXQoYtLfbLHjl_DXlZiiR2XRb2hvPoaZBq78AwWe8zExoySMog-4Tg5ukykXSaIoIvlMqk1LzLXY1H8i8F2GmZ15PypWPtWlP3qjDRqDXrjAmUvqJRFqbf4SO__nD2r6_auhRXbWljf0OADG3xZK0Pa0spad2GliRcpprYMss572nKaCXbD2k2n7Mhw9ckxeUvNFwramd6kEoLjbZcpCPNMjQz0VXsYbS1zWIu-S8tksfBtIneaxWX9xCBwrkyxfjv-98Xl6fL-7OTu-o9PDPZU37TPG7-mkmFsqRTYfrtIWJogCq3qarupO0kqumGy0cE_fcnukq2o4D9Yr2r_dt1MdDRT_Og7vFRTtHRYTHSISxa8O_cG0t-SHRhAi1For4JBGizSNxhdwIsp7Tc2R1VxBumyHvnvoGfQLXrRhB7Emo_pmVLYwB1TyfNj4PMgrVEeUuHvm4M9N4t8PCEflOFbEWZPHtbY6-qK5mtesR1Pe8ma1n0PeyRnsU_sJSSjaRx-NN9gXQFl7up_XiPD11LIDvheXuS0IG-ywF3SiP-rxL93DAyjMWXfjtVhEYRRMqJ8foMsd1u5v5Ws4WKR9SZk04J5nyB7pfeetkP0Rd9DFHlYRP2pVXMvHxEVsObm235Xuad8Afvggfb_kS6ysehagc-N4jJfeKTPsr-CZSRZUJNtVJi6WQC7NUyllxLyFrX8mew-l91uP2V-6kotR-f5AUR4eO7hw4mmReQzYoC_rCvKGnQ9wp0V5O8gNIdtqD6VYaOpNzlF1M_fWcv0uSUe8ZjTkdERcDA9gNSM-kPIY2Jc5OIUz7k-OmbJ8uEARNZdm7NlyQXDxbbv7SuHyybHcyzdqk8oC6qooNu6U7t2bI4eyuaNb3ZU2tw-vnr2K_6KFvox57sfZYKdPD-ZVwn-iHZ9oO7Ww-Gw8VXLGzFw7HdkXfVQ1U_VeGfmWwe2YJwhHB8p1eqzr6ruqideFQT3_RBvmGlcsFzQFiFOFuSZlLBvVHjEO1toczuA6UjJFp4D6X5VPDb6VMVujOnrZ4pSffj0eao7hiXEEPJY84JMzrT6DCnwyCw-Nq2pQH_en2ETqA-53kg7XBsSf-64cTT-mOyu4Ih0FQBjDSSLq4rAUI3kQd3z0nV4L5I946mk2h2PWrLG-PqYDE-PXsjyflmWN5L1-CGnou5gHFHUD9bCbOGK62S43YmztbNkf8Tx87K9ieyWqRFzXuER-JvCh4ExRSO9XzMvivY-K3pMZYrgjRG8CYL_kwjeBGHQCYX7E-HBTwr33xMejIeUikF0xhVMm7eFGhKqHhwSl7SzkbCKPblarV6gXHdlKdijuTmweo2wx1PP1A1sodgfeX5wYoZ2GIGX6OUIfqSPbwGPee7VGRapsellJ5QtFSKl-NJSaalnS7GVeK1J39csea8wfV39KcpUL2ME_7UxhYXXDNNbY2qb1uYxHsOXQ7t4b2iHiTA47Z6WPuR-6U8jqi986pXlfHf4CtFQ6dDSx6P4dByeKEQknnWQkphrEx2H4-OXsZQMHe0u3ssuE4iZ72nnMddFTomHlH289zCo-Z77soc7ajEYylzDnTK8Z7uoyprcs1bqzcnIjoOoD9MxUAR2b5DQYaZkbtlNlta0NeZX7T4_C4_7lMuBtMVZ_ZiFp-D59g3fCgR0mZPXm31qqW95Qdx_wZ_gFYHweiBOw0UapHglYIsdckn9vG75CgedgASYcBu8Qsew9MBaskZNIJN4h4NJ9_ZfstPgvr_ol8iD4jAogAc9oJ1a1-1hYVLj6qBrxeFPazcghMEijA_Wh3EWuzHsqOM4CcKCBTQIAq9Mwoz6aU7D_EDQjAl5COYFgx58HZIf-q7vu5Bmwv_AjZw0TvMEtyVpukjiyIeFjMFmRAw3sQftoRaJ17O4ynGp9te0B7CPwyN7tmOouBLscHwEQ6i-zcY_Wuj_6uBAczrUhP4HBLAG5Q>53457</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            SelectionDAG assert in LLVM 12
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
      </td>
    </tr>

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

    <tr>
      <th>Reporter</th>
      <td>
          dbabokin
      </td>
    </tr>
</table>

<pre>
    I have a test case, which fails with LLVM 12, but works with LLVM 13 and later. We have customers using LLVM 12 backend, so we need a fix for LLVM 12. I would appreciate help identifying the commit and crafting the patch for LLVM 12. Ideally, if this is low-risk patch, we should have it  in 12.0.2 update (if it's going to happen).

With LLVM 12 the fail looks as follows:

```
> llc bugpoint-reduced-simplified.ll -mcpu=haswell
llc: /localdisk2/dybaboki/llvm/llvm-12.0/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp:4707: llvm::SDValue llvm::SelectionDAG::getNode(unsigned int, const llvm::SDLoc &, llvm::EVT, llvm::SDValue, const llvm::SDNodeFlags): Assertion `(!VT.isVector() || VT.getVectorElementCount() == Operand.getValueType().getVectorElementCount()) && "Vector element count mismatch!"' failed.
PLEASE submit a bug report to https://bugs.llvm.org/ and include the crash backtrace.
Stack dump:
0.      Program arguments: llc bugpoint-reduced-simplified.ll -mcpu=haswell
1.      Running pass 'Function Pass Manager' on module 'bugpoint-reduced-simplified.ll'.
2.      Running pass 'X86 DAG->DAG Instruction Selection' on function '@b___vydvyi'
 #0 0x0000000001ce8693 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/localdisk2/dybaboki/llvm/bin-12.0/bin/llc+0x1ce8693)
 #1 0x0000000001ce63de llvm::sys::RunSignalHandlers() (/localdisk2/dybaboki/llvm/bin-12.0/bin/llc+0x1ce63de)
 #2 0x0000000001ce8b5f SignalHandler(int) (/localdisk2/dybaboki/llvm/bin-12.0/bin/llc+0x1ce8b5f)
 #3 0x00007f30bc2e43c0 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x153c0)
 #4 0x00007f30bbd7818b raise /build/glibc-eX1tMB/glibc-2.31/signal/../sysdeps/unix/sysv/linux/raise.c:51:1
 #5 0x00007f30bbd57859 abort /build/glibc-eX1tMB/glibc-2.31/stdlib/abort.c:81:7
 #6 0x00007f30bbd57729 get_sysdep_segment_value /build/glibc-eX1tMB/glibc-2.31/intl/loadmsgcat.c:509:8
 #7 0x00007f30bbd57729 _nl_load_domain /build/glibc-eX1tMB/glibc-2.31/intl/loadmsgcat.c:970:34
 #8 0x00007f30bbd68f36 (/lib/x86_64-linux-gnu/libc.so.6+0x36f36)
 #9 0x0000000001b01e67 llvm::SelectionDAG::getNode(unsigned int, llvm::SDLoc const&, llvm::EVT, llvm::SDValue, llvm::SDNodeFlags) (/localdisk2/dybaboki/llvm/bin-12.0/bin/llc+0x1b01e67)
#10 0x0000000001ae6914 llvm::SelectionDAG::getZExtOrTrunc(llvm::SDValue, llvm::SDLoc const&, llvm::EVT) (/localdisk2/dybaboki/llvm/bin-12.0/bin/llc+0x1ae6914)
#11 0x0000000000bc749d createVariablePermute(llvm::MVT, llvm::SDValue, llvm::SDValue, llvm::SDLoc&, llvm::SelectionDAG&, llvm::X86Subtarget const&) (/localdisk2/dybaboki/llvm/bin-12.0/bin/llc+0xbc749d)
#12 0x0000000000af8442 llvm::X86TargetLowering::LowerBUILD_VECTOR(llvm::SDValue, llvm::SelectionDAG&) const (/localdisk2/dybaboki/llvm/bin-12.0/bin/llc+0xaf8442)
#13 0x0000000001a48e98 (anonymous namespace)::SelectionDAGLegalize::LegalizeOp(llvm::SDNode*) (/localdisk2/dybaboki/llvm/bin-12.0/bin/llc+0x1a48e98)
#14 0x0000000001a47fe3 llvm::SelectionDAG::Legalize() (/localdisk2/dybaboki/llvm/bin-12.0/bin/llc+0x1a47fe3)
#15 0x0000000001b39349 llvm::SelectionDAGISel::CodeGenAndEmitDAG() (/localdisk2/dybaboki/llvm/bin-12.0/bin/llc+0x1b39349)
#16 0x0000000001b37299 llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) (/localdisk2/dybaboki/llvm/bin-12.0/bin/llc+0x1b37299)
#17 0x0000000001b33f57 llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) (/localdisk2/dybaboki/llvm/bin-12.0/bin/llc+0x1b33f57)
#18 0x0000000000aba975 (anonymous namespace)::X86DAGToDAGISel::runOnMachineFunction(llvm::MachineFunction&) (/localdisk2/dybaboki/llvm/bin-12.0/bin/llc+0xaba975)
#19 0x00000000011cdcad llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (/localdisk2/dybaboki/llvm/bin-12.0/bin/llc+0x11cdcad)
#20 0x00000000015d3568 llvm::FPPassManager::runOnFunction(llvm::Function&) (/localdisk2/dybaboki/llvm/bin-12.0/bin/llc+0x15d3568)
#21 0x00000000015d9de1 llvm::FPPassManager::runOnModule(llvm::Module&) (/localdisk2/dybaboki/llvm/bin-12.0/bin/llc+0x15d9de1)
#22 0x00000000015d3c1c llvm::legacy::PassManagerImpl::run(llvm::Module&) (/localdisk2/dybaboki/llvm/bin-12.0/bin/llc+0x15d3c1c)
#23 0x000000000067fc41 main (/localdisk2/dybaboki/llvm/bin-12.0/bin/llc+0x67fc41)
#24 0x00007f30bbd590b3 __libc_start_main /build/glibc-eX1tMB/glibc-2.31/csu/../csu/libc-start.c:342:3
#25 0x000000000067d62e _start (/localdisk2/dybaboki/llvm/bin-12.0/bin/llc+0x67d62e)
Aborted (core dumped)
```

Here's the reduce test case:
```llvm
; ModuleID = 'bugpoint-reduced-simplified.bc'
source_filename = "t.ispc"
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

; Function Attrs: nounwind readnone
declare <4 x float> @llvm.x86.sse41.blendvps(<4 x float>, <4 x float>, <4 x float>) #0

; Function Attrs: nounwind
define void @b___vydvyi() #1 {
allocas:
  %i_load.i = load <4 x i32>, <4 x i32>* undef, align 16
  %index_0.i.i = extractelement <4 x i32> %i_load.i, i32 0
  %index_1.i.i = extractelement <4 x i32> %i_load.i, i32 1
  %v_0.i.i = extractelement <4 x double> zeroinitializer, i32 %index_0.i.i
  %v_1.i.i = extractelement <4 x double> zeroinitializer, i32 %index_1.i.i
  %ret_0.i.i = insertelement <4 x double> undef, double %v_0.i.i, i32 0
  %ret_1.i.i = insertelement <4 x double> %ret_0.i.i, double %v_1.i.i, i32 1
  %ret_2.i.i = insertelement <4 x double> %ret_1.i.i, double undef, i32 2
  %ret_3.i.i = insertelement <4 x double> %ret_2.i.i, double undef, i32 3
  %val.i.i = bitcast <4 x double> %ret_3.i.i to <4 x i64>
  %new01.i.i.i = shufflevector <4 x i64> %val.i.i, <4 x i64> undef, <2 x i32> <i32 0, i32 1>
  %new01f.i.i.i = bitcast <2 x i64> %new01.i.i.i to <4 x float>
  %result01f.i.i.i = call <4 x float> @llvm.x86.sse41.blendvps(<4 x float> undef, <4 x float> %new01f.i.i.i, <4 x float> undef) #1
  %result01.i.i.i = bitcast <4 x float> %result01f.i.i.i to <2 x i64>
  %final.i.i.i = shufflevector <2 x i64> %result01.i.i.i, <2 x i64> undef, <4 x i32> <i32 0, i32 1, i32 2, i32 3>
  store <4 x i64> %final.i.i.i, <4 x i64>* undef, align 8
  ret void
}

attributes #0 = { nounwind readnone }
attributes #1 = { nounwind }

!llvm.module.flags = !{!0}

!0 = !{i32 2, !"Debug Info Version", i32 3}
```

Here's the attached file with the reproducer:
[reduced.tar.gz](https://github.com/llvm/llvm-project/files/7954939/reduced.tar.gz)

Original problem is tracker here: https://github.com/ispc/ispc/issues/2243

</pre>
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