<div dir="ltr">Yes that was supposed to be Index == 0. I'll fix. Why doesn't clang have that warning?</div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature" data-smartmail="gmail_signature">~Craig</div></div>
<br><div class="gmail_quote">On Sun, Aug 13, 2017 at 1:11 PM, Sean Silva via llvm-commits <span dir="ltr"><<a href="mailto:llvm-commits@lists.llvm.org" target="_blank">llvm-commits@lists.llvm.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><br><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Aug 13, 2017 at 10:40 AM, Craig Topper via llvm-commits <span dir="ltr"><<a href="mailto:llvm-commits@lists.llvm.org" target="_blank">llvm-commits@lists.llvm.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Author: ctopper<br>
Date: Sun Aug 13 10:40:02 2017<br>
New Revision: 310794<br>
<br>
URL: <a href="http://llvm.org/viewvc/llvm-project?rev=310794&view=rev" rel="noreferrer" target="_blank">http://llvm.org/viewvc/llvm-pr<wbr>oject?rev=310794&view=rev</a><br>
Log:<br>
[AVX512] Correct isExtractSubvectorCheap so that it will return the correct answers for extracting 128-bits from a 512-bit vector and for mask registers.<br>
<br>
Previously it would not return true for extracting either of the upper quarters of a 512-bit registers.<br>
<br>
For mask registers we support extracting anything from index 0. And otherwise we only support extracting the upper half of a register.<br>
<br>
Differential Revision: <a href="https://reviews.llvm.org/D36638" rel="noreferrer" target="_blank">https://reviews.llvm.org/D3663<wbr>8</a><br>
<br>
Modified:<br>
llvm/trunk/lib/Target/X86/X86I<wbr>SelLowering.cpp<br>
<br>
Modified: llvm/trunk/lib/Target/X86/X86I<wbr>SelLowering.cpp<br>
URL: <a href="http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86ISelLowering.cpp?rev=310794&r1=310793&r2=310794&view=diff" rel="noreferrer" target="_blank">http://llvm.org/viewvc/llvm-pr<wbr>oject/llvm/trunk/lib/Target/X8<wbr>6/X86ISelLowering.cpp?rev=3107<wbr>94&r1=310793&r2=310794&view=<wbr>diff</a><br>
==============================<wbr>==============================<wbr>==================<br>
--- llvm/trunk/lib/Target/X86/X86I<wbr>SelLowering.cpp (original)<br>
+++ llvm/trunk/lib/Target/X86/X86I<wbr>SelLowering.cpp Sun Aug 13 10:40:02 2017<br>
@@ -4579,7 +4579,13 @@ bool X86TargetLowering::isExtractSu<wbr>bvect<br>
if (!isOperationLegalOrCustom(ISD<wbr>::EXTRACT_SUBVECTOR, ResVT))<br>
return false;<br>
<br>
- return (Index == 0 || Index == ResVT.getVectorNumElements());<br>
+ // Mask vectors support all subregister combinations and operations that<br>
+ // extract half of vector.<br>
+ if (ResVT.getVectorElementType() == MVT::i1)<br>
+ return Index = 0 || ((ResVT.getSizeInBits() == SrcVT.getSizeInBits() * 2) &&<br>
+ (Index == ResVT.getVectorNumElements()))<wbr>;<br></blockquote><div><br></div><div><br></div><div>Is this supposed to be `Index == 0`?</div><div><br></div><div>I'm getting this warning (`gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.4) `):</div><div><br></div><div><div>/home/sean/pg/llvm/llvm/lib/<wbr>Target/X86/X86ISelLowering.<wbr>cpp: In member function ‘virtual bool llvm::X86TargetLowering::<wbr>isExtractSubvectorCheap(llvm::<wbr>EVT, llvm::EVT, unsigned int) const’:</div><div>/home/sean/pg/llvm/llvm/lib/<wbr>Target/X86/X86ISelLowering.<wbr>cpp:4586:65: warning: suggest parentheses around assignment used as truth value [-Wparentheses]</div><div> (Index == ResVT.getVectorNumElements()))<wbr>;</div><div> ^</div></div><div><br></div><div><br></div><div>-- Sean Silva</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
+<br>
+ return (Index % ResVT.getVectorNumElements()) == 0;<br>
}<br>
<br>
bool X86TargetLowering::isCheapToSp<wbr>eculateCttz() const {<br>
<br>
<br>
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