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<p class="MsoNormal">Please ignore. Wrong mailing list. Wanted to send it to OpenMP Lang Committee.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b>From:</b> Narayanaswamy, Ravi <br>
<b>Sent:</b> Monday, November 16, 2020 10:57 AM<br>
<b>To:</b> openmp-dev@lists.llvm.org<br>
<b>Subject:</b> Is omp construct valid in a simd routine.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Is this example valid<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="CodeCxSpFirst">int counter;<o:p></o:p></p>
<p class="CodeCxSpMiddle">#pragma omp declare simd simdlen(16)<o:p></o:p></p>
<p class="CodeCxSpMiddle">void __attribute__((noinline)) foo(bool isSIMD){<o:p></o:p></p>
<p class="CodeCxSpMiddle"> if (!isSIMD) {<o:p></o:p></p>
<p class="CodeCxSpMiddle"> #pragma omp parallel num_threads(1)<o:p></o:p></p>
<p class="CodeCxSpMiddle"> printf("%d\n", counter);<o:p></o:p></p>
<p class="CodeCxSpMiddle"> } else {<o:p></o:p></p>
<p class="CodeCxSpMiddle"> printf("%d\n", counter);<o:p></o:p></p>
<p class="CodeCxSpMiddle"> }<o:p></o:p></p>
<p class="CodeCxSpMiddle">}<o:p></o:p></p>
<p class="CodeCxSpMiddle"><o:p> </o:p></p>
<p class="CodeCxSpMiddle">void bar() {<o:p></o:p></p>
<p class="CodeCxSpMiddle"> foo(false); // Is the user wrong to expect this call to foo honor “#pragma omp parallel” in foo?<o:p></o:p></p>
<p class="CodeCxSpMiddle">}<o:p></o:p></p>
<p class="CodeCxSpMiddle"><o:p> </o:p></p>
<p class="CodeCxSpMiddle">void baz() {<o:p></o:p></p>
<p class="CodeCxSpMiddle"> #pragma omp simd<o:p></o:p></p>
<p class="CodeCxSpMiddle"> for(int i = 0; i < 32; i++)<o:p></o:p></p>
<p class="CodeCxSpMiddle"> foo(true); // Is it the compiler’s responsibility to ignore the “#pragma omp parallel” inside foo() for this call?<o:p></o:p></p>
<p class="CodeCxSpLast">}<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The spec says<o:p></o:p></p>
<p class="CodeCxSpFirst">The execution of the function or subroutine, when called from a SIMD loop, cannot result in the<o:p></o:p></p>
<p class="CodeCxSpMiddle">execution of an OpenMP construct except for an ordered construct with the simd clause or an<o:p></o:p></p>
<p class="CodeCxSpLast">atomic construct. <o:p></o:p></p>
<p class="MsoNormal">Thanks<o:p></o:p></p>
<p class="MsoNormal">Ravi<o:p></o:p></p>
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