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<div class="moz-cite-prefix">On 7/2/2017 3:50 AM, Breger, Igor via
llvm-dev wrote:<br>
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<p class="MsoNormal">Hi all,<o:p></o:p></p>
<p class="MsoNormal">I am working on enabling X86 using
GLobalIsel framework.<o:p></o:p></p>
<p class="MsoNormal">I have 32bit platform + float/double
configuration (-mtriple=i386-linux-gnu -mattr=+sse2 )
<o:p></o:p></p>
<p class="MsoNormal"> load i64, i64* %p1
- illegal, require narrowScalar action<o:p></o:p></p>
<p class="MsoNormal"> load double, double * %p1
- legal <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">What is the best approach to Legalize this
case ? Should I mark G_LOAD/G_STORE s64 as Custom?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<br>
In the world of GlobalISel, i64 and double are both s64, so "load
i64" and "load double" are the same operation; if one is Legal, both
are Legal. This should just work, barring any bugs.<br>
<br>
The resulting code will probably be low-quality because there isn't
any good way to lower the resulting transfers between SSE and
integer registers, but you can put off dealing with that for now.<br>
<br>
-Eli<br>
<pre class="moz-signature" cols="72">--
Employee of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project</pre>
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