<html><head><meta http-equiv="Content-Type" content="text/html charset=iso-8859-1"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><br><div><div>On Feb 17, 2013, at 1:01 PM, Reed Kotler <<a href="mailto:rkotler@mips.com">rkotler@mips.com</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">
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<div class="moz-cite-prefix">On 02/17/2013 12:48 PM, Andrew Trick
wrote:<br>
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<pre wrap="">On Feb 16, 2013, at 1:31 PM, Cameron Zwarich <a class="moz-txt-link-rfc2396E" href="mailto:zwarich@apple.com"><zwarich@apple.com></a> wrote:
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<pre wrap="">That's exactly the right place.
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<pre wrap="">Really? You don't want the expansion to be optimized? You want to specify a machine model for the pseudo's as if they're real instructions? You don't want to schedule or register allocate the real instructions?
-Andy
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So then maybe my code should be called during instruction selection?<br>
<br>
The very original MIPs port was for Mips I and Mips I has a need for
lots of psuedos because it's primitive.<br>
That code has mostly been removed now because we don't support Mips
I which is just an historical processor at this time.<br>
<br>
I approach level one implementations of things from the point of
view of correctness and then make things better as I understand the
problem better. <br>
<br>
So my base scheme for all of this was to create multi line assembler
expansion in pseudos.<br>
<br>
Now that I'm passing mostly all of test-suite, I'm starting improve
things.<br>
<br>
At this time, I'm starting to place expansion in <br>
<pre wrap=""><big>expandPostRAPseudo
Would it be possible to call this same code during instruction selection?
When I emitting the code for certain formats, I would need to call some emitter which basically the same kind of I'm calling from expandPostRAPseudo now.</big></pre></div></blockquote><div><br></div>expandISelPseudos is the place to cleanup after ISEL hacks, and can create BBs. But, as Cameron explained well in the other thread, if you want a macro assembler for some sequences, do it late in expandPostRAPseudos.</div><div>-Andy</div><div><br></div><div><br><blockquote type="cite"><div bgcolor="#FFFFFF" text="#000000"><blockquote cite="mid:79A2DD5E-F601-430B-99A7-EB29BCB640AF@apple.com" type="cite"><blockquote type="cite"><pre wrap="">On Feb 16, 2013, at 1:08 PM, Reed Kotler <a class="moz-txt-link-rfc2396E" href="mailto:rkotler@mips.com"><rkotler@mips.com></a> wrote:
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<pre wrap="">I have a bunch of pseudos that I want to lower right after instruction selection.
Where is the best place to do that?
I was planning to use expandPostRAPseudo.
Is there a better place?
TIA.
Reed
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