<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/141710>141710</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            `(x << 1) | 1` => `shld(x, 1, 0x80...)` for vectors of 8 x u64
        </td>
    </tr>

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

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

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

<pre>
    ([LLVM Godbolt](https://llvm.godbo.lt/#z:OYLghAFBqd5QCxAYwPYBMCmBRdBLAF1QCcAaPECAMzwBtMA7AQwFtMQByARg9KtQYEAysib0QXACx8BBAKoBnTAAUAHpwAMvAFYTStJg1C1aANxakl9ZATwDKjdAGFUtAK4sGexwBk8DTAA5DwAjTGIJAHZSAAdUBUI7Bhd3Tz04hNsBPwDgljCIrmirTBskoQImYgIUjy8uS0xrLIYKqoIcoNDwqMtK6tq0hoV%2Bjv8u/J6igEpLVDdiZHYOLBoAgGp0BVQAfVpUUVp1gFIAZicADnXVdbwANkkz7HWAAX5UCDPL69uHp5OAEwAVg003W%2B0OOzcDGYbHQOyY6HQxBOkQAQscNABBbCCYgATxAmKx60BQK4J1OABF1goEG4qFR6KZSkQUV8rjd7o9Ts8vtz1nE8NsGKRfpJBahhQIxQKhSLZQ9JdLReLlQq1fKZZqpRqBRonmKOT9uf9jsCNEbzpzbqcAWbzng7etoraAesLrLnQBOL3uriWt3rLgNINcAF%2B4OnSNSJ7E0nmoHus40yp0daHI7Grl/XmvEzmAB0VDptELpgu3M%2B1pNub5Fqt3xzPPr5MbNtNeYUMQMBHWEAFXGm03jZNOlJpJEpTfFZuBEeng8VEsD%2BuX61XSs3K/X243cexpOImD72dnecTp2Jx0iVOv2NW4022z2BzE047ddeISq1ZnndbUFwTfWgoRhVhMHhRFkVRDFsVxAgCSJQ8yQpFNaXpRlmVZKczwAxclS1VU5V1bUSJVdciMo0jiMImjqIotUAFpvQBAFTlOSIAQ0U47guIFJEiSIgQuDQLkND9axbMlAzwu0HScJ13VdJSPUjX0w1XZ0QxjBdVK4aMwxbUdE2Tal1jTI5M0k5t/heAsWGLUty0rB4/0/aTE1kmtbIvYFQzwr9u17ftB2HUdj1PHzz1be1sRvO94ofUoDGPGyYvzMxHJLBAywrKtApbdspIkwqnjBc1Ti4YkOFmWhOCBXgvA4LRSFQTgfB8AA1ABZdYAEkACVaXmRZMEBKreAITRatmABrEAQX0ThJCama2s4XgFBAS1ppa2rSDgWAkDQFgYjocJyEoU7zvoCITBsYhoTmvg6AIcJtogEJ1pCfwqkJbheF%2B5gCQAeRCbRWU4HhSFOthBFBhhaAB1qsBCNxgCcMRaG2wHSCwFhDGAcR9vxvBjzKFlcdazBVFKNx3uh3h/He%2BrSdoPAQmIf6XCwdbELwFgmdIFliBCeJMCpTBCaMDmjBm2YmSYYAFC6vBMAAd1BmJGGF/hBBEMR2CkGRBEUFR1FJ3QGgMeWHP0TntsgWZUBiFpcaYlhkBiNwUwALwYUXGra0XiDwLAnYgWYSjKewIEcQZ6lIXxxjyAp0niRIBETjPMiSTo06mRpmnKUYc%2BGJpWVL9oC%2B6Qo%2BnacuG%2BqWvJkKaPRqWCQ6oatbSfajhwVoZB%2B0Q56wQgXBCFw9ihymhX5sWy02dW0hmtagetp20g9q0Ydlo4AE%2B43zad4XkWPqSEBJCAA%3D%3D%3D)) ([Zig Godbolt](https://zig.godbo.lt/#z: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%2Bji2jld6P1C4gwR%2B2BJyPxEWWAFpXZszndllxS4Oh/zMGP9XWh3flq8oW3oe6vfEWF62MRgJghAg8FQ8bBJyTCcmye7IngywAPQEpIJZGvW97UgBkGHn8cF0rsGjohOBBTssbaIch1KPssqgvpG76fmEP5/gBQEgWBEEQFwh7HlBsHcrcER1ueyF4QREAUSSm57Ao0QGPGhIsVB5wYdxS4Yiuz7zvO%2BwSVJEByWcCnwTxt73vq2yUjieLGSCFnGk8prmrQ1oVvaD6oEczpXm6kY%2Bn6AZBqG4aedGTCxuGiZmCmaYZsI2Z5gWlYlv2NY3uegnEGaCgWlaoGupyAUsJ6OYSpgCi9sWBmWQalnPJgqjHFCtn8KgDl2sWzVQklZm4ilaUWtanKnpiC57LKJUEBFhCOLK8ZDcVAUxnGCauEsYWYKmyxapMJ7xYhVlPCC1W1cstnBJUTVxa1A4dc5SxQgAskIdyOYIL7puNk0tsNs1BfNnqLUm4X7JFWY5vmI2lpts7qSinzfPup5lZdXV2ZlfWcnddzw7tFXPBwky0Jwfy8J4HBaKQqCcAAWmYqzTLMV7nBEPCkAQmg45MADWIB/Bo%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%2BMGQwQJ/haAhLCendxtAQzoBAIHOOLAr6iBLotNmpBYT52iI7XhHACbWIFoIxZyzr5KjieIyQkjpHtLkfTeoyxnAinoMQeRp4lHN0mAgL%2BWBwhgI0VonRERPSSAxLotkfwohgohVCw%2BhyBHDIcco1mpA1HczxhwCI/DbG%2BORaWDFZxsUANxZ80gFd4h2EkEAA))

Naïve code (znver5):

```llvm
define dso_local <8 x i64> @foo(<8 x i64> %0) local_unnamed_addr {
Entry:
  %1 = shufflevector <8 x i64> <i64 poison, i64 poison, i64 poison, i64 poison, i64 poison, i64 poison, i64 poison, i64 0>, <8 x i64> %0, <8 x i32> <i32 7, i32 8, i32 9, i32 10, i32 11, i32 12, i32 13, i32 14>
  %2 = tail call <8 x i64> @llvm.fshl.v8i64(<8 x i64> %0, <8 x i64> %1, <8 x i64> splat (i64 1))
  %3 = or <8 x i64> %2, <i64 1, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0>
  ret <8 x i64> %3
}

declare <8 x i64> @llvm.fshl.v8i64(<8 x i64>, <8 x i64>, <8 x i64>) #1
```

```asm
.LCPI0_1:
        .byte   1
        .byte   0
foo:
        vpxor   xmm1, xmm1, xmm1
        valignq zmm1, zmm0, zmm1, 7
        vpshldq zmm0, zmm0, zmm1, 1
        vpmovsxbq       xmm1, word ptr [rip + .LCPI0_1]
        vporq   zmm0, zmm0, zmm1
        ret
```

Better (znver5):

```llvm
define dso_local <8 x i64> @bar(<8 x i64> %0) local_unnamed_addr {
Entry:
  %1 = shufflevector <8 x i64> <i64 poison, i64 poison, i64 poison, i64 poison, i64 poison, i64 poison, i64 poison, i64 -9223372036854775808>, <8 x i64> %0, <8 x i32> <i32 7, i32 8, i32 9, i32 10, i32 11, i32 12, i32 13, i32 14>
  %2 = tail call <8 x i64> @llvm.fshl.v8i64(<8 x i64> %0, <8 x i64> %1, <8 x i64> splat (i64 1))
  ret <8 x i64> %2
}
```

```asm
.LCPI1_0:
        .quad   -9223372036854775808
bar:
        valignq zmm1, zmm0, qword ptr [rip + .LCPI1_0]{1to8}, 7
        vpshldq zmm0, zmm0, zmm1, 1
        ret
```
</pre>
<img width="1" height="1" alt="" src="http://email.email.llvm.org/o/eJzsWdnvo8iP_2vol2ha3JCH70NVcYQrCYFA4GXElYJwBkg4_vpV8u3umZ7p2dVeWmn1i6KUy7jsssv-YEg0DAVusuyD4CDBSV-ix5i3_YcXVUUa9eWXuE2XD4IWCQ6apmdt1DaN22okOImgxXwcu4FgAEErBK1U1bP-il_Xv1bjm8WsBAMOgYlzoMB7ytloBsF0DKCFanhKoQkUykYJiI4yAtY6wdECArAnZbRsuIAT3hqjHchgGYqYtC8AzSKEwGhh4wJwBrtuAtYTKIHrjDqmEBWB_RyV1TYE7iQZtxSoynkEBjuo2TzBUpRcADhpAjdX1XSwCx0A0jM8awLMU8ZdSTbfD_A4Sbi6Ia2vi96FQ9naWh1g7XxbxIdDzr2pBca91ZJ2L013azT48U7mrUfQHA1vT_FB0IrOF1juTE9Ki3AXHEzYAqx2JPRscPW689nrKKxoICwSIDUXL40nsC_LVdj5AFy4M5KOJr997DruAOQJeJgkGf-tnzwc1kRSg3hnH5aA39kzPJQ2sIdkDyCMEQowcGdQGzNPQttgdeoAoELhVlbZu3LijdAp7bMn9rdUaLfuID7HlWpkcT-oxuna6TDKc1ubbSN3zNDe6ql5yszKvlNXIwzv3ekOT21TGwd3-7hubwPay_HarfE9AX68NljIxraPQDaYvdnY8GAyj77wR6Y38V7bJ0B5O8EeGmfv6IJMNnW7ewwsuXRkGu00Qe0rglYu9VNeawBJT-pG2ezwg7HeC6lu_4g55T4y83o89pwV78d9Fpwt24I7XwbKRa1J5hbuD5Xe6XLnXpXwAeWswaInD9Jbx-PCUxdnYIyXIZplkmzuDlotCXTaZInb0fpMFt7hSe99lqTplYarTLJCmmaac6fCpknjszK5Vx-3p9zLrV1-UkrvJCmDNwOMHN0WF7tT9tGlO1W1FxrJOoE5qRzKO3MeFZ8d3UuTwmrJW2Fp9e2uteMZKN3ThkBxq4OjAZs8swJ-aIouF46G7Ydkm-Ve2kZzbFVgnR7kzkl0ivFS3Tmebxdyoi4hac83mHoGG1nTHJ9TmXajirq5GmeRJfcqxzwDg6-a53Ehe8gStEIStBK5MlXWY6w9A8Vep377oITrCOndOb1Rx926UnFGDafnYcu213MrqUd1CZ6rNe90E4Jl6o0RdHE6dFo53ZsbTCi3YIPyoNR-fkDwgp-ANU-OYrv4CkUAKADDNAByCZAXXepTaMnQ6DOguadorAHsZWBfSDfXUVRH9MBesAKBQ3VdRPeOhH1QSraCg1ub6IvcnoX12SLNhUOQt279xDzQEn1ssaxTHbpO91KP8-wz6ziMbJCdUHzyz-wud5TDmEMF5nkEIHUfINrPGCXWKVLpaeegScklFSSn7XN-wttqKFWSRiv0FGM_M4-cyQla2WVvzb2Ttkdg19qVv6ApjWVzUnCdakpVQJTpFupciCJLqm-wpoPaCQKgIP4JLQBSCta6qr7QM4dQtk40KtUTlM_KiVJ0xlaxlfm7I-k244D98AwLpUuioMpLWOyn8wTMKThf1D4iL4U0maAJsB84NyObNDmxQ77SLvN8W0BHNsVJg7J7O1qF47YkX5-6ujHOQfJ2QdU73zO3LXrPeLt9j02UPNQ3dfefemlEx9PdRzbfRmPsXKNbPnltCD-Byeb4ycYXiJRpW-RLnV-4wV9IOvXJvB4jnI0dTeLtnQzSqmWB_IkEzBql7KX0j3dHhjoCgKA5Rvrzz5agt5vP-09Y4H_v9rMW-P_y7gPA82gpuskvoMGqp_LAMroIeHNgbSUs6axaA6liANpbQQ5AWJcAUrZiV4Marsnx6N3YelKu1wX55yNqC3LqXS3IQREWoHYZd2GLcnCXpdWHSUfTcigVdL9H1PGeVX2cELRi8MDB49mj9TLFLAlzHkS5QIYBdJAGTmEA4BGGwb3Fe4yCdbweVjGigWbTeyArShUAKqYnsIZMhZXgoaZCK16w5t1fYAHsaz8oADL2TYOSicDVFG5uAFKcrbT_OPhACvU9Gse8unMosu3LjaCVVipOinMZmC7vka0BcDjn5VS7RsWynXEorRHuDpgNbrLXXEKX1DFaVuuuWGHMGvnZMixDbbF52TVHKQiEGDwvRwNbXqD5txZBS4bloibs5aTOQxicvUBOATjkgQs0JG-Zyp6kA5ArCAE1Chb0jr6KIDxeFXzkSH3ZDgqSNdEKLQA5A9tIRUlQrQ30KQXf2uURCMoxqqZc0QooAAxcuqgliaAV2Sx1c0w5aj83Q44f_qzerHVPdZ9tQEHfqpQ_UojF0-nNoqG-HGfZ94HSXcJhbdKqmh328MKR1VKP24ufM9fqLrY-02b88yr7Ck9bJ6zjHGBRscUY6ouLknrJBK3BywSOttxpeqg-_a1wxrBUd42YKGQ_qLc2P0DoDkMcaUlOGcdhuONnpwr8tZaPHEErGNoy9qEs28qUC7sKDrukT-QT9cgWhbVPMjg7Ts0JoCVt9ajm2uBBbgrS2WGD4rEK6_PwdmtyPF2Gi5-gZnLnUWCed3o534rMVB2kNGopdn3d21TrPSOJb-Vk7S41Xwaf-MKDEN5VNspS1UXzQy3CGtVREA4aHXLYr4LqSe8D5pHhRlYjhP0qatVHt4DzoPOHwOkwKraDD2vfjqrmqOP7baegsRENLFX04K-eXVZhzRZVdPbHqDGarkCcYBr6WYZKjg6mIYZS4oHz3KgoeshD4AdGvcxRZ-nCHORedUSI8qlkGBuon11vjijApgnnzDYGQ6mlyyHQTKF77EtyHPYDBa_75m6ea_Yi6IofcM9ao6tuHIS7UzTr9fjouCpMLx4dVlc_adJ0nYRRuRzhVC6kPl0XUWd3MDLsO0oA8Ovgvrqm5QkNlI-oBHaNWc4Ckq9BglbgJ04Xia7l1sC7DRJBq0mJuM4Wy9sJmiRQgBZxpFPUtgJsjXcGbAVq7uzXPSKBHdgF_wBDOEwzHLvpZtXcOY64QaaxkcdPCdUTLjg8jVI9mx0MLLm_AbgfEYlMBokKPnbqQbs8WXigchaAuPTA00uW_sazAoeQdQYPcocnV97Hax4AE0qylvCJLtrTadYxvQSH3QQ4MjAPrmLDGwBtPLM6Hgyuo08Hi6CVCeNC1QToSBouDNTyeSa0W1uVme5WS81kFxwol1bmCxcKj6f9ehRB93x4FkDic0NomR6f44cpaXu5z-P9MGMLXlRV6GsAjdkJTKMGQDXceLoDg6-WyXgiUM6cM68DBHAiaMXmixKKOzZts9PhRu0cUAJ7QGQ-72x7koPdaSokmaCVDgzt83THD-W-axHsTnXuSVOCca7kjhpYqmE_8mB2ZxfWOwvZj70Yi8u2diW8zIpgAlLnDbtp95JWTZot45xV45vCHkzT7oJDmMxcPh3rDvgAA6CvbLndiRbrj7rEFpYTDLN8cqA8663G-u1Qx_ul6k0EHFCAx07TbacVkjwqVdFuQzvPixcAVbaJrg93UEJjQsaUBVoxy46uF6N_mtAWSbRsaIkdiGTtrmdg-hldQGhJtqS1eAYAOEMrFIEcyKJ3uMOMt6D_aBScu0XDKoZNijp0a9jujCM2u-gV0M9Ow1LtydZf3U8EchNlTTqPwF5bCLTd4WCCni-g2Y77uoOBy9GFJlzyHUCxrymtNofL2nPGrci0xS5v3W40y6ubtcvcgKJpLTs7dWy125M1wObbnA-nHGuk1zYn-XR0HDCb7VhepzbHbe6h6S2UL3AnaUnSUnUHqF2yzvmENIJWpPizGTqcIl9Swnk4g_0ciiRWUjan5VJ-tS-vfoUgAUGCfUQghgDKM9skbZq9mpi1eWY995JgwKcQwZOf39fDM0GCNLsWTbZJh_b3qk2iakMwSNzMm4JnCUbeECx5bdtXO_Qzm-bIV5_0XvL7o2miOkt_j9K03xACJEggN2O_fBrdvKSpDcFImyF_XK9V9sySse3_aolBBc9uurYY2oag0eZ_a0YSjPyif-XRH1yG_r4pht4I77UMvRG_E9vvBEX-oKgfFP2DYn5QLyvfo0G_ozFGRbVJouoXMX-_2bgOefX1Kb64v47_L3yg_s4duioaX8nwcp76kTDvjTDvjfz9LGiO_qbo26LvofuvEd8877Px74aYV1IK0md2pllSRX32nw7I37z-BePV1TPUn0vgLxURDa-C-Gqio0b-Tn1P3s_P13gZs81mQ_2C99LzKpKfFjy7ue03m81c1-_w_TT-SSyqCtzcN-u3y2tdk9_G91z4SeWQV-n9zzI_yf6kt6vb5zDH92_z7-antk833dhvCA72RbchaLj54TEn_aSh7V-rf2ntD7E-G_8eUpiNY9b_TwFQHPX_rwDoty1NM4xAkwwvcqwgcCIp_guTtv8MEfQfEPEfly71O_mX0r0_onSz-XXYSfDKrp8r9x9K8v6PtfMyyUmEAKmxFV8b_W8U7l_q6Uv6waRbZht9yT4ogRVZkqS24pf8I-FpkdqSiZBxYnxNhUggmW2SiVQaXYWMSr4UHzRJcyRHiyTNMpT4NYu2HP9yPGJoLo4YgiWzOiqqr--DbXv8pRiGR_ZBsZRAkV-qKM6q4f2WnqabbNq8rxI0TXDSl_7jtei3-IGHV2YUwzj8oWYsxir7eO2fFufXaRIMeh_yhhBeBE--Uu19tjz5isxL7jMONNqQs0h-_fr1lRA8ubm2_eazWodNe9288uLBs18effXx88sYXIz5I_6atPW3Pwa-Db91fXvLkpGglbcDA0Er3zx8ftD_FgAA__9GWWwp">