<div style="line-height:1.7;color:#000000;font-size:14px;font-family:Arial"><br><div>Thank you for your suggesttion.</div><div>I have already     written the defined as following:<br></div>BUILTIN(__builtin_x86_max_qb, "iii", "") <br><br><div style="position:relative;zoom:1"></div><div id="divNeteaseMailCard"></div><br>在 2018-09-13 01:49:19，"Friedman, Eli" <efriedma@codeaurora.org> 写道：<br> <blockquote id="isReplyContent" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">

    <div class="moz-cite-prefix">On 9/12/2018 6:36 AM, 沈天豪 via llvm-dev

      wrote:<br>

    </div>

    <blockquote type="cite" cite="mid:72d82c65.f299.165cdff9bd5.Coremail.17862703959@163.com">

      <div style="line-height:1.7;color:#000000;font-size:14px;font-family:Arial">

        <div>Hello，everyone.</div>

        <div><span id="result_box" class="short_text" tabindex="-1" lang="en"><span class="">I am very embarrassed to ask such a

              simple question.</span></span></div>

        <div>I want to add an intrinsics(named max_qb) in x86 backend.</div>

        <div>In include/llvm/IR/IntrinsicsX86.td, I add a intrinsics

          (GCCBuiltin)<code class="language-cpp hljs">.</code></div>

        <div>In clang( BuiltinsX86.def ), I add a <code class="hljs

            java">BUILTIN.</code></div>

        <div>And in x86 backend , I change :<br>

        </div>

        <div>the X86InstrInfo.td to add def X86max_qb_flag , <br>

        </div>

        <div>X86InstrArithmetic.td to add define of instruction ,</div>

        <div>X86ISelLowering.cpp to add SDnode.</div>

        <div>It's succeed when <span id="result_box" class="short_text" tabindex="-1" lang="en"><span class="">LLVM compilates.But

              there is an error “use of unknown builtin

              '__builtin_x86_max_qb' ”，when I test the</span></span><span id="result_box" class="short_text" tabindex="-1" lang="en"><span class=""> intrinsics.</span></span></div>

      </div>

    </blockquote>

    <br>

    All clang builtins are required to have a C language signature

    defined in clang; for x86, look in

    include/clang/Basic/BuiltinsX86.def .<br>

    <br>

    -Eli

    <pre class="moz-signature" cols="72">-- 

Employee of Qualcomm Innovation Center, Inc.

Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project</pre>

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