<div dir="ltr"><div>Great,<br></div>thank you for your help!<br></div><div class="gmail_extra"><br><div class="gmail_quote">2017-07-05 17:06 GMT+02:00 Hal Finkel <span dir="ltr"><<a href="mailto:hfinkel@anl.gov" target="_blank">hfinkel@anl.gov</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<div class="m_3797083560036960419moz-cite-prefix">On 07/05/2017 09:58 AM, Anastasiya
Ruzhanskaya wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">
<div>Oh, yes...strange<br>
<code><span style="color:rgb(0,0,0)">attributes </span><span style="color:rgb(136,0,0)">#0 = { noinline nounwind
optnone uwtable "correctly-rounded-divide-sqrt<wbr>-fp-math"="false"
"disable-tail-calls"="false" "less-precise-fpmad"="false"
"no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-lea<wbr>f"
"no-infs-fp-math"="false" "no-jump-tables"="false"
"no-nans-fp-math"="false" "no-signed-zeros-fp-math"="fal<wbr>se"
"no-trapping-math"="false" "stack-protector-buffer-size"=<wbr>"8"
"target-cpu"="x86-64" "target-features"="+fxsr,+mmx,<wbr>+sse,+sse2,+x87"
"unsafe-fp-math"="false" "use-soft-float"="false" }</span><span style="color:rgb(0,0,0)"></span><span style="color:rgb(0,0,0)"><br>
<br>
</span></code></div>
<code><span style="color:rgb(0,0,0)">How this can be avoided? it
is always so after clang -s -emit-llvm<br>
</span></code></div>
</blockquote>
<br></span>
This is because clang defaults to -O0, and in that mode, does not
produce IR that is intended to be optimized. You probably want to
do:<br>
<br>
clang -S -emit-llvm -O3 -mllvm -disable-llvm-optzns<br>
<br>
to get out the unoptimized IR.<span class="HOEnZb"><font color="#888888"><br>
<br>
-Hal</font></span><div><div class="h5"><br>
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<div class="gmail_extra"><br>
<div class="gmail_quote">2017-07-05 16:49 GMT+02:00 Hal Finkel <span dir="ltr"><<a href="mailto:hfinkel@anl.gov" target="_blank">hfinkel@anl.gov</a>></span>:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<div class="m_3797083560036960419m_-773001609585264129moz-cite-prefix">On
07/04/2017 04:25 AM, Anastasiya Ruzhanskaya via
llvm-dev wrote:<br>
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<blockquote type="cite">
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<div>
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<div>
<div>Hello,<br>
</div>
I am developing now a compiler, based
on llvm infrastructure, so I am building
my own sequence of llvm passes with some
adjustable options. <br>
<br>
</div>
I can't find really clear info about some
cases, so maybe you can help, and write:<br>
<br>
</div>
<div>0) Why I should always delete
attributes before applying optimizations
with opt command? With attributes
specified no optimization can be applied.<br>
</div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
<br>
</span> You definitely shouldn't delete attributes in
general. Does your attribute set include optnone?<br>
<br>
-Hal<br>
<br>
<blockquote type="cite"><span>
<div dir="ltr">
<div>
<div>
<div>
<div>
<div><br>
</div>
Where I can get real benefit from:<br>
</div>
1) Constant Hoisting<br>
</div>
<div>-only when we have some large reusable
constants in program?<br>
</div>
2) argpomotion<br>
</div>
- this option does not always replace all my args
by reerence with values, when I specify it.<br>
</div>
</div>
<br>
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</span>
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</font></span></pre><span class="m_3797083560036960419HOEnZb"><font color="#888888">
</font></span></blockquote><span class="m_3797083560036960419HOEnZb"><font color="#888888">
<pre class="m_3797083560036960419m_-773001609585264129moz-signature" cols="72">--
Hal Finkel
Lead, Compiler Technology and Programming Languages
Leadership Computing Facility
Argonne National Laboratory</pre>
</font></span></div>
</blockquote></div>
</div>
</blockquote>
<pre class="m_3797083560036960419moz-signature" cols="72">--
Hal Finkel
Lead, Compiler Technology and Programming Languages
Leadership Computing Facility
Argonne National Laboratory</pre></div></div></div></blockquote></div><br></div>