<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/107950>107950</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [RISC-V] Assertion `TrueV0Def && TrueV0Def->isCopy() && MIV0Def && MIV0Def->isCopy()' failed.
        </td>
    </tr>

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

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

    <tr>
      <th>Reporter</th>
      <td>
          patrick-rivos
      </td>
    </tr>
</table>

<pre>
    LLVM IR:
```llvm ir
target datalayout = "e-m:e-p:64:64-i64:64-i128:128-n32:64-S128"
target triple = "riscv64-unknown-linux-gnu"

define void @m(<vscale x 4 x i1> %0) #0 {
entry:
  %broadcast.splatinsert184 = insertelement <vscale x 4 x ptr> zeroinitializer, ptr null, i64 0
  %broadcast.splat185 = shufflevector <vscale x 4 x ptr> %broadcast.splatinsert184, <vscale x 4 x ptr> zeroinitializer, <vscale x 4 x i32> zeroinitializer
 %wide.masked.gather186 = tail call <vscale x 4 x i32> @llvm.masked.gather.nxv4i32.nxv4p0(<vscale x 4 x ptr> %broadcast.splat185, i32 4, <vscale x 4 x i1> %0, <vscale x 4 x i32> zeroinitializer)
 %predphi187 = select <vscale x 4 x i1> %0, <vscale x 4 x i32> %wide.masked.gather186, <vscale x 4 x i32> zeroinitializer
  %1 = extractelement <vscale x 4 x i32> %predphi187, i32 0
  store i32 %1, ptr null, align 4
  ret void
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(read)
declare <vscale x 4 x i32> @llvm.masked.gather.nxv4i32.nxv4p0(<vscale x 4 x ptr>, i32 immarg, <vscale x 4 x i1>, <vscale x 4 x i32>) #1

attributes #0 = { "target-features"="+64bit,+d,+f,+relax,+v,+xsifivecdiscarddlone,+zicsr,+zve32f,+zve32x,+zve64d,+zve64f,+zve64x,+zvl128b,+zvl32b,+zvl64b,-a,-b,-c,-e,-experimental-smctr,-experimental-smmpm,-experimental-smnpm,-experimental-ssctr,-experimental-ssnpm,-experimental-sspm,-experimental-supm,-experimental-zacas,-experimental-zalasr,-experimental-zicfilp,-experimental-zicfiss,-experimental-zvbc32e,-experimental-zvkgs,-h,-m,-shcounterenw,-shgatpa,-shtvala,-shvsatpa,-shvstvala,-shvstvecd,-smaia,-smcdeleg,-smcsrind,-smepmp,-smstateen,-ssaia,-ssccfg,-ssccptr,-sscofpmf,-sscounterenw,-sscsrind,-ssqosid,-ssstateen,-ssstrict,-sstc,-sstvala,-sstvecd,-ssu64xl,-svade,-svadu,-svbare,-svinval,-svnapot,-svpbmt,-xcvalu,-xcvbi,-xcvbitmanip,-xcvelw,-xcvmac,-xcvmem,-xcvsimd,-xsfcease,-xsfvcp,-xsfvfnrclipxfqf,-xsfvfwmaccqqq,-xsfvqmaccdod,-xsfvqmaccqoq,-xsifivecflushdlone,-xtheadba,-xtheadbb,-xtheadbs,-xtheadcmo,-xtheadcondmov,-xtheadfmemidx,-xtheadmac,-xtheadmemidx,-xtheadmempair,-xtheadsync,-xtheadvdot,-xventanacondops,-xwchc,-za128rs,-za64rs,-zaamo,-zabha,-zalrsc,-zama16b,-zawrs,-zba,-zbb,-zbc,-zbkb,-zbkc,-zbkx,-zbs,-zca,-zcb,-zcd,-zce,-zcf,-zcmop,-zcmp,-zcmt,-zdinx,-zfa,-zfbfmin,-zfh,-zfhmin,-zfinx,-zhinx,-zhinxmin,-zic64b,-zicbom,-zicbop,-zicboz,-ziccamoa,-ziccif,-zicclsm,-ziccrse,-zicntr,-zicond,-zifencei,-zihintntl,-zihintpause,-zihpm,-zimop,-zk,-zkn,-zknd,-zkne,-zknh,-zkr,-zks,-zksed,-zksh,-zkt,-zmmul,-ztso,-zvbb,-zvbc,-zvfbfmin,-zvfbfwma,-zvfh,-zvfhmin,-zvkb,-zvkg,-zvkn,-zvknc,-zvkned,-zvkng,-zvknha,-zvknhb,-zvks,-zvksc,-zvksed,-zvksg,-zvksh,-zvkt,-zvl1024b,-zvl16384b,-zvl2048b,-zvl256b,-zvl32768b,-zvl4096b,-zvl512b,-zvl65536b,-zvl8192b" }
attributes #1 = { nocallback nofree nosync nounwind willreturn memory(read) }
```

Backtrace:
```
> /scratch/tc-testing/tc-compiler-fuzz-trunk/build-gcv/build-llvm-linux/bin/llc reduced.ll
llc: /scratch/tc-testing/tc-compiler-fuzz-trunk/llvm/llvm/lib/Target/RISCV/RISCVVectorPeephole.cpp:410: bool {anonymous}::RISCVVectorPeephole::convertSameMaskVMergeToVMv(llvm::MachineInstr&): Assertion `TrueV0Def && TrueV0Def->isCopy() && MIV0Def && MIV0Def->isCopy()' failed.
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
Stack dump:
0.      Program arguments: /scratch/tc-testing/tc-compiler-fuzz-trunk/build-gcv/build-llvm-linux/bin/llc reduced.ll
1.      Running pass 'Function Pass Manager' on module 'reduced.ll'.
2.      Running pass 'RISC-V Vector Peephole Optimization' on function '@m'
 #0 0x00005f64a118b090 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/scratch/tc-testing/tc-compiler-fuzz-trunk/build-gcv/build-llvm-linux/bin/llc+0x1e94090)
 #1 0x00005f64a118849f llvm::sys::RunSignalHandlers() (/scratch/tc-testing/tc-compiler-fuzz-trunk/build-gcv/build-llvm-linux/bin/llc+0x1e9149f)
 #2 0x00005f64a11885f5 SignalHandler(int) Signals.cpp:0:0
 #3 0x000073cfabc42520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #4 0x000073cfabc969fc __pthread_kill_implementation ./nptl/pthread_kill.c:44:76
 #5 0x000073cfabc969fc __pthread_kill_internal ./nptl/pthread_kill.c:78:10
 #6 0x000073cfabc969fc pthread_kill ./nptl/pthread_kill.c:89:10
 #7 0x000073cfabc42476 gsignal ./signal/../sysdeps/posix/raise.c:27:6
 #8 0x000073cfabc287f3 abort ./stdlib/abort.c:81:7
 #9 0x000073cfabc2871b _nl_load_domain ./intl/loadmsgcat.c:1177:9
#10 0x000073cfabc39e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
#11 0x00005f649fa0162e (anonymous namespace)::RISCVVectorPeephole::convertSameMaskVMergeToVMv(llvm::MachineInstr&) RISCVVectorPeephole.cpp:0:0
#12 0x00005f649fa022b3 (anonymous namespace)::RISCVVectorPeephole::runOnMachineFunction(llvm::MachineFunction&) RISCVVectorPeephole.cpp:0:0
#13 0x00005f64a0084297 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (.part.0) MachineFunctionPass.cpp:0:0
#14 0x00005f64a06aba77 llvm::FPPassManager::runOnFunction(llvm::Function&) (/scratch/tc-testing/tc-compiler-fuzz-trunk/build-gcv/build-llvm-linux/bin/llc+0x13b4a77)
#15 0x00005f64a06abec9 llvm::FPPassManager::runOnModule(llvm::Module&) (/scratch/tc-testing/tc-compiler-fuzz-trunk/build-gcv/build-llvm-linux/bin/llc+0x13b4ec9)
#16 0x00005f64a06ac881 llvm::legacy::PassManagerImpl::run(llvm::Module&) (/scratch/tc-testing/tc-compiler-fuzz-trunk/build-gcv/build-llvm-linux/bin/llc+0x13b5881)
#17 0x00005f649f9829c6 compileModule(char**, llvm::LLVMContext&) llc.cpp:0:0
#18 0x00005f649f8c7bd6 main (/scratch/tc-testing/tc-compiler-fuzz-trunk/build-gcv/build-llvm-linux/bin/llc+0x5d0bd6)
#19 0x000073cfabc29d90 __libc_start_call_main ./csu/../sysdeps/nptl/libc_start_call_main.h:58:16
#20 0x000073cfabc29e40 call_init ./csu/../csu/libc-start.c:128:20
#21 0x000073cfabc29e40 __libc_start_main ./csu/../csu/libc-start.c:379:5
#22 0x00005f649f9797e5 _start (/scratch/tc-testing/tc-compiler-fuzz-trunk/build-gcv/build-llvm-linux/bin/llc+0x6827e5)
zsh: IOT instruction (core dumped) /scratch/tc-testing/tc-compiler-fuzz-trunk/build-gcv/build-llvm-linux/bin/llc
```

Godbolt: https://godbolt.org/z/TGzsjT7P3

Tested using d9a996020394a8181d17e4f0a0fc89d59371f9af

`-opt-bisect-limit` points to `RISC-V Vector Peephole Optimization`

Found via fuzzer.
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJzEWVtz26oW_jXKC2OPhO4PeXCSep_ONLM7bSavHoSQzTYCBZDi-Nef4SJZdpw9bc-0p5OKjwWsu2BhIaXolhNyG6R3Qfpwg3q9E_K2Q1pSvF9IOgh1U4n67fbLl-dH8PlbEK-C8CEIV0EWuj_GhhZQ6agayS3RoEYaMfQmeg2C-AEEEJJFG8QrsuiCeJUl9rGgE4hgEcSrCBYLHkNH-25oEJ6x1ZJ2jIwsJVV4yJJFz_dcvPIFo7w_LLa8n5a5Z00aygkYBK1BkIRtYITdDwojRsABJOAAaBTEn0AA0zCAJQhgHIIgv3PLCdfybTIbmFmVFKjGSOml6hjSlCsidVQkVjPXI4y0hBvzzyV1WhpRRyIF5VRTxOiRyADemxHAe8YMplkCwo8FRkVqRald3zSMDARrIT8S9S_6GlE_ruA7p5lQvZ_ptA5g-kprsmyR2pN6uUV6R2RUZFZvjSgDGDH2Ec8gsWl1vnrJD0NCY2jbLrwSxg8tjorUujWG4KrR8_j_sKGwPNnaSVJ3OxoVuQsMYQS_D_4PifnIcz8dAsMpsuqQg5YIf5iTJ8EnM0Z3TVmotJDEkgzby4RFjG45SMbJkmj7vvnXMH-Yv49BfAfWPceaCg5WWksVxCvAhUmICuE94KKRhAAu1BvHgIuev1Jeg1fKmCS6lxy0pBXyLYCFJKieAlETzJAkvyWpRn_QtkVy-2EOfRwkv7FEc08grSWtek2U33PMxpbfmc3N7XiLhiDdS6LMlhY_mCe8y5KK6gDeB_Cudk3jGkkYOjg4uOagaEMHgmuqMJJ1zQQnbuRIsZIeDiSGzQwfJpwl9Qw3MzzNYREsqqkTwxPOEoMXyDwswuZB7OPQEUlNMiK2UC3W8gq17dorVH6Nqq5yUNfnXiP2V4hHhJG6QmVIvRd2pLihrLtOV1fYDBWO4XtnHIf91s7emYdVSu2w6LkmkvBX198i3SEH9YCYh4M6kQd1NqBNDthOi6ijtrgmjGw9VpJyP4F0beeQ0kgTwm1HjesUxs12RJ1zu1JYNF3bjPhMWzVjrl6Eoh6ecVem3tAOa-zbyYKZ_qrPkgOzcEA1GUHvQIWkJ1E-ID-No0441kNXtRYd8IBY71FFJ6BbxGnnu4S9etQiPCLSeqRoazU6qAYTpIjHA-5G1HCJGe0OzUszkV5bhPHLy8tIeDH9WtRn_Rfhx93L27Be7cZXd3HQO4LqCs1wNcPqhHErZh3B61YMJ0LTkpbWhxNhNNJ1LgdJ2yEqTwSzNZ96Q-08fBhMFnNkpInO6fKKd3bmEUWwkMrBLBkRcloeUbVDDjCp_IIWRVnl4Kuf7ww_OpuPlZtY7X13P_YPrnVrsFuD3SSXSEdMXNO4phWdB2NrDTrWlDtejWPSVE1LuYM730yEce5uDsZRiv2GeKS4Eu2EugkdPcKoFWjEtBkRU-MiLF2-HSnm7g08UuNyhxrCMaEO7yjXXLNTp0P9uHbXeX6j7Xv35L6pfUt868zdO3l75Rvipyk_7NzWtr0TqpUL7-AjNviQDTNHGvzaIo93YzsN--gO-61vRzrHI_BaDHs-zfHpZNC4Xo3tuE5N69S4ztsxeEMGFoXQx21gURYXUweGSTHhNBthDPNsoidhOQ2kERxhlqbxRC-i0gxAMNVJ53VBNNUF_1ONdGI_Xd3mtcgdwntTJZL3N7yxbDMl4lphiTTeBXCt8UITpalxuelg0XaUEblo-uNxoWXP9wFcVz1l9WKLhwmbIsxd1gzJBHnNGAaS1D0m9ZIxJ48xbOrCXxBpBMwaWgVw_WTrqQCuv33-fv88ts_25vSVkG4nGFnizlxPkyg0gishmPE64oK_taJXxn_xKohXV5a6ASz4QKT-jlryiNT--ZHILXkSz49DAAurjp32iPCOcvKZK_PyZqZ-jVdgpcytzNTEQRY-yZ48hw-kAXZCBibCIog_UXUvOhNaV1TaCY-fz-b77uXsAOagQZSReum8_PXLp9X3T0D1VUs1QKDqt0CSTkgNtAA7rTtTnQdwHcD1lupdXy2xaM-dvOik-IeY43tNlepNtboGiNeAcsz6mgC9IwBLpHagGrPMi_-uTTLXfdtNaRcugf33VYqtRC1Actub4kj9Yjb8cgJGXpFvPeeUb0GHlHkf8-nu8tUQHhFHW3MbzIHgoBV1z4iZNeMGc28t_ICjSajFM3ApBcacAn93mrb0iIwwz78ZZQcwd79l5NMlNA5BeAjDMEybLEFRVFRhGYJT2qk35cBXSbm2nn-yL_w8NyV63QilJUGtzaR7QLl2aVb8RucH8C48RKRMwjKcX6zj6MKmIimbazZ96_l3uuWI_QfxmhFTLRR_Tu0oKZszteGl2mmTgjMFA1h4zzqy8rtPaP9PjGLPKI9xgyqcwBSG3ii3sR2KbJMl8x-_zABeKrHMrHp2yZlyyTnPMisbDDabTu_MUbHZU8Y2tO3crwU2-8AygGvemUJiPZ-2NFt0kgTxKs9O_NMf4W-uCByxf-Wc218FZ97IrnGeL_tXdkV5wS6_dG6SZ2CrbDwsJwcDuF7a3puqialq151Q1CSCRFQRyxvmQbya-aA4Zw2LvIkBqsy-alnp2oXPkpx2kbH4xKF8xyGqwIazDROo3tSiRdTFhdoCb23Irdpi5NhFUW5U8mE3b1J4zjAuSZn9XCrZJVMqGZ7z17NsUBhl0Ox-xXRoAo5aojq7zZS_6_gEHx_ms9fJ6Asv9IWwin9ZX9nzv7nXZjwUrml6Gvs5ZeP5JhKGRQLLHHzI3ZxGM72uKnShSQCLZYekXtqfva_wu65XcqZXhiqUz_VafzVLx3PxpzX67dt1XCUoz8_SOL20iODyByx6tKf9ecg96U9aQ3B5Zk12YQ0uimhmDSNbhN98KXCy63Pbscm2_7dNaVFEZzblZy9uWcASZ8DLmsKAd0gGcGX_7mcWf_ny_HgvuCYH7a1gDF_P7eJMToHzqs6A3Wr_gOFpHVb1-QZ7eQqUdRmCzcbsyxulkdQbcyXcTIcBVv3748ofiNcWLXdBvErtOZtNUmF4KZUkof1gs6Gc6ktBDhruC8vdnT_2kx48uRZG15iemXLNiqvM49zszemJ9_m-XuZlTlLguP6JwGUFzEk6Be6ojFfB57-fADWnVD_W7AUWktjrDnFX8t-o18dX_b9EXQmmjYoXFzw3sBTSqHA01-a_juqfp_xrPF__RJQmNeiVucPUJSrLLIRhXCaoiIqojnKSNCEKG1yUdVrGedSUqDn7ApSFC9HpRUUVwXrBaEt1kIWgE5RrZS6eQRb-yKXo3K616HkNBoqA8RiRy5v6Nq7LuEQ35DbKYVrGSZnAm91tQqowauIEo5xUNU6aPMVJWJK4iZOkSuANvYUhTMIyCkMYRWG2rJI8SYosi-MapmUTBklIWkTZ0n5SEnJ7Y6--t1GYl2l4w1BFmLJf1SHk5BXY0QDCIH24kbc2ZFW_VUESMqq0OrHRVDP7Od7ZH6QPf_yXgZtesttfv_p7Fwy38L8BAAD__zwRGQE">