<div class="gmail_quote">On 17 February 2012 15:24, Chad Rosier <span dir="ltr"><<a href="mailto:mcrosier@apple.com">mcrosier@apple.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">

<div class="im"><br>
On Feb 17, 2012, at 3:03 PM, Eric Christopher wrote:<br>
<br>
> Author: echristo<br>
> Date: Fri Feb 17 17:03:39 2012<br>
> New Revision: 150848<br>
><br>
> URL: <a href="http://llvm.org/viewvc/llvm-project?rev=150848&view=rev" target="_blank">http://llvm.org/viewvc/llvm-project?rev=150848&view=rev</a><br>
> Log:<br>
> Ignore the lifetime intrinsics in fast-isel.<br>
><br>
> Modified:<br>
>    llvm/trunk/lib/CodeGen/SelectionDAG/FastISel.cpp<br>
><br>
> Modified: llvm/trunk/lib/CodeGen/SelectionDAG/FastISel.cpp<br>
> URL: <a href="http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/SelectionDAG/FastISel.cpp?rev=150848&r1=150847&r2=150848&view=diff" target="_blank">http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/SelectionDAG/FastISel.cpp?rev=150848&r1=150847&r2=150848&view=diff</a><br>


> ==============================================================================<br>
> --- llvm/trunk/lib/CodeGen/SelectionDAG/FastISel.cpp (original)<br>
> +++ llvm/trunk/lib/CodeGen/SelectionDAG/FastISel.cpp Fri Feb 17 17:03:39 2012<br>
> @@ -567,6 +567,10 @@<br>
>   // Handle selected intrinsic function calls.<br>
>   switch (F->getIntrinsicID()) {<br>
>   default: break;<br>
> +    // At -O0 we don't care about the lifetime intrinsics.<br>
<br>
</div>Which leaves me to wonder if there are any other intrinsics (or IR in general) being generated at -O0 that aren't necessary?  This isn't necessarily directed at Eric, but the community in general.<br></blockquote>

<div><br></div><div>I've been looking for a name (like "DbgInfoIntrinsic") to wrap up the intrinsics which are safe to ignore in most contexts. A group for "optimization hints" that I could isa<> on would be really nice. ("OptznHintIntrinsic"?)</div>

<div><br></div><div>Nick</div><div><br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<span class="HOEnZb"><font color="#888888"><br>
 Chad<br>
</font></span><div class="HOEnZb"><div class="h5"><br>
> +  case Intrinsic::lifetime_start:<br>
> +  case Intrinsic::lifetime_end:<br>
> +    return true;<br>
>   case Intrinsic::dbg_declare: {<br>
>     const DbgDeclareInst *DI = cast<DbgDeclareInst>(Call);<br>
>     if (!DIVariable(DI->getVariable()).Verify() ||<br>
><br>
><br>
> _______________________________________________<br>
> llvm-commits mailing list<br>
> <a href="mailto:llvm-commits@cs.uiuc.edu">llvm-commits@cs.uiuc.edu</a><br>
> <a href="http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits" target="_blank">http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits</a><br>
<br>
_______________________________________________<br>
llvm-commits mailing list<br>
<a href="mailto:llvm-commits@cs.uiuc.edu">llvm-commits@cs.uiuc.edu</a><br>
<a href="http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits" target="_blank">http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits</a><br>
</div></div></blockquote></div><br>