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<a href="https://gitlab.com/dueno">Daiki Ueno</a>
started a new
discussion on <a href="https://gitlab.com/gnutls/gnutls/-/merge_requests/1335#note_523016428">lib/accelerated/x86/x86-common.c</a>:
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<pre style="margin: 0;"> <span id="LC297" class="line" lang="c"><span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC298" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC299" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">/* We are actually checking for SHA512 */</span></span>
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<pre style="margin: 0;"> <span id="LC300" class="line" lang="c"><span class="k" style="font-weight: 600;">static</span> <span class="kt" style="color: #458; font-weight: 600;">int</span> <span class="nf" style="color: #900; font-weight: 600;">check_phe_sha512</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">unsigned</span> <span class="n" style="color: #333;">edx</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC301" class="line" lang="c"><span class="p">{</span></span>
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<pre style="margin: 0;">-<span id="LC304" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="p">((</span><span class="n" style="color: #333;">edx</span> <span class="o" style="font-weight: 600;">&</span> <span class="n" style="color: #333;">via_bit_PADLOCK_PHE_SHA512</span><span class="p">)</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">via_bit_PADLOCK_PHE_SHA512</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC302" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="p">((</span><span class="n" style="color: #333;">edx</span> <span class="o" style="font-weight: 600;">&</span> <span class="n" style="color: #333;">bit_PADLOCK_PHE_SHA512</span><span class="p">)</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">bit_PADLOCK_PHE_SHA512</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC303" class="line" lang="c"><span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC304" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC305" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">/* On some of the Zhaoxin CPUs, pclmul has a faster acceleration effect */</span></span>
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<pre style="margin: 0;">+<span id="LC306" class="line" lang="c"><span class="k" style="font-weight: 600;">static</span> <span class="kt" style="color: #458; font-weight: 600;">int</span> <span class="nf" style="color: #900; font-weight: 600;">check_fast_pclmul</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">void</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC307" class="line" lang="c"><span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC308" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">unsigned</span> <span class="kt" style="color: #458; font-weight: 600;">int</span> <span class="n" style="color: #333;">a</span><span class="p">,</span><span class="n" style="color: #333;">b</span><span class="p">,</span><span class="n" style="color: #333;">c</span><span class="p">,</span><span class="n" style="color: #333;">d</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC309" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">unsigned</span> <span class="kt" style="color: #458; font-weight: 600;">int</span> <span class="n" style="color: #333;">family</span><span class="p">,</span><span class="n" style="color: #333;">model</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC310" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC311" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">__get_cpuid</span><span class="p">(</span><span class="mi" style="color: #099;">1</span><span class="p">,</span> <span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">b</span><span class="p">,</span> <span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">c</span><span class="p">,</span> <span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">d</span><span class="p">))</span></span>
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<p dir="auto"><a href="https://gitlab.com/zzjianhui" data-user="6607356" data-reference-type="user" data-container="body" data-placement="top" class="gfm gfm-project_member js-user-link" title="zzjianhui">@zzjianhui</a> sorry, I failed to spot this during the review, but shouldn't this condition be <code>!__getcpuid(...)</code>? We have <code>#define __getcpuid(...) 0</code> as a fallback, and in that case GCC reports:</p>
<pre class="code highlight js-syntax-highlight console" lang="console" v-pre="true" style="background-color: #fff; font-family: monospace; font-size: 90%; -premailer-cellpadding: 0; -premailer-cellspacing: 0; -premailer-width: 100%; margin: 0;"><code><span id="LC1" class="line" lang="console"><span class="go" style="color: #888;">x86-common.c: In function 'register_x86_crypto':</span></span>
<span id="LC2" class="line" lang="console"><span class="go" style="color: #888;">x86-common.c:314:15: warning: 'a' may be used uninitialized in this function [-Wmaybe-uninitialized]</span></span>
<span id="LC3" class="line" lang="console"><span class="gp" style="color: #555;"> 314 | family = ((a ></span><span class="o" style="font-weight: 600;">></span> 8<span class="o" style="font-weight: 600;">)</span> & 0x0F<span class="o" style="font-weight: 600;">)</span><span class="p">;</span></span>
<span id="LC4" class="line" lang="console"><span class="go" style="color: #888;"> | ~~~^~~~~</span></span>
<span id="LC5" class="line" lang="console"><span class="go" style="color: #888;">x86-common.c:308:15: note: 'a' was declared here</span></span>
<span id="LC6" class="line" lang="console"><span class="gp" style="color: #555;"> 308 | unsigned int a,b,c,d;</span></span>
<span id="LC7" class="line" lang="console"><span class="go" style="color: #888;"> | ^</span></span>
<span id="LC8" class="line" lang="console"></span></code></pre>
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