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

      wrote:<br>

    </div>

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

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        <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>

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    <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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