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<div class="moz-cite-prefix">On 6/24/19 3:27 PM, Zakharin, Vyacheslav P via cfe-dev wrote:<br>
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<p class="MsoNormal"><span lang="EN-US">Hello,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Is it possible to get appropriate -Wuninitialized warnings with OpenMP for the following cases?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">int reduction(int *input) {<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> int i, r;<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">#pragma omp target parallel for map(to: input) reduction(+: r)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> for (i = 0; i < 100; ++i)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> r += input[i];<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> return r;<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">}<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">int linear() {<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> int i, r;<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">#pragma omp target parallel for linear(r)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> for (i = 0; i < 100; ++i)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> r += 1;<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> return r;<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">}<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">void firstprivate(int *input) {<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> int r;<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">#pragma omp target firstprivate(r) map(tofrom: input[0:1])<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> *input = r;<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">}<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">It compiles silently with -fopenmp, but the errors become obvious w/o it:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">warn.c:5:5: warning: variable 'r' is uninitialized when used here [-Wuninitialized]<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">warn.c:14:5: warning: variable 'r' is uninitialized when used here [-Wuninitialized]<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">warn.c:21:12: warning: variable 'r' is uninitialized when used here [-Wuninitialized]<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Is it worth a tracker?</span></p>
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<p>Yes, I think that filing a bug would be useful.</p>
<p>Thanks again,</p>
<p>Hal<br>
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<p class="MsoNormal"><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Slava<o:p></o:p></span></p>
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<pre class="moz-quote-pre" wrap="">_______________________________________________
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<pre class="moz-signature" cols="72">--
Hal Finkel
Lead, Compiler Technology and Programming Languages
Leadership Computing Facility
Argonne National Laboratory</pre>
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