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<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">> Are there real world program that have this kind of behavior?<o:p></o:p></p>
<p class="MsoPlainText">[Demikhovsky, Elena] As Hideki said, fortran applications are FP IV based. I can't say how easy to map FP IV to integer.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoNormal">Clarification. Things might have been messed up in translation.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">FORTRAN programmers can use (certainly not “must use”) FP induction variable like below ------ but as I wrote below,<o:p></o:p></p>
<p class="MsoNormal">FORTRAN frontend converts it into integer primary induction variable.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
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<p class="MsoNormal" style="border:none;padding:0in">Hideki<o:p></o:p></p>
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<p class="MsoNormal">Snippet from my reply on May 20<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">I looked at what our FORTRAN compiler (non-LLVM) does for the following (x, y, z, and f are float by default typing,</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">based on names).</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> subroutine foo(x, y, z, A, N)</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> double precision A(N)</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> do f = x, y, z</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> A(f) = f</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> enddo</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> end</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">The frontend computes the trip count outside of the loop (per language rule) and uses an integer primary</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">induction variable (compile-generated) for loop control. So, (future) FORTRAN usage doesn’t seem to be</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">a good example for promoting support for case A (= FP primary induction variable).</span><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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