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<p class="MsoNormal"><span style="font-size:11.0pt">Reported via https://llvm.org/bugs/show_bug.cgi?id=31357<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal">On 12/9/16, 1:42 PM, "Friedman, Eli" <<a href="mailto:efriedma@codeaurora.org">efriedma@codeaurora.org</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On 12/9/2016 11:03 AM, Jim Lewis via llvm-dev wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="text-autospace:none"><span style="font-size:11.0pt">Thanks, that helps enormously! The issue is that the match is supposed to support both cascade and tree OR patterns, but there appears to be a problem with the tree matching. Both
test1 and test6 in the ARM tests exercise the cascade pattern, and I remember now our fix is confined to the tree case.</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:11.0pt">I hesitate to claim now that there’s no coverage for the tree pattern, but it is failing to match the patterns we use in our tests, one of which looks like this:</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:11.0pt;font-family:Courier">define i32 @test_tree(i32 %x) {</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:11.0pt"> </span><span style="font-size:11.0pt;font-family:Courier">%byte0 = and i32 %x, 255 ; 0x000000ff</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:11.0pt;font-family:Courier"> %byte1 = and i32 %x, 65280 ; 0x0000ff00</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:11.0pt;font-family:Courier"> %byte2 = and i32 %x, 16711680 ; 0x00ff0000</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:11.0pt;font-family:Courier"> %byte3 = and i32 %x, 4278190080 ; 0xff000000</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:11.0pt;font-family:Courier"> </span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:11.0pt;font-family:Courier"> %tmp0 = shl i32 %byte0, 8</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:11.0pt;font-family:Courier"> %tmp1 = lshr i32 %byte1, 8</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:11.0pt;font-family:Courier"> %tmp2 = shl i32 %byte2, 8</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:11.0pt;font-family:Courier"> %tmp3 = lshr i32 %byte3, 8</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:11.0pt;font-family:Courier"> </span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:11.0pt;font-family:Courier"> %or0 = or i32 %tmp0, %tmp1</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:11.0pt;font-family:Courier"> %or1 = or i32 %tmp2, %tmp3</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:11.0pt;font-family:Courier"> </span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:11.0pt;font-family:Courier"> %result = or i32 %or0, %or1</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:11.0pt;font-family:Courier"> ret i32 %result</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:11.0pt;font-family:Courier">}</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:11.0pt">I’m still investigating exactly how it’s failing on this one; let me know if I’m missing something else here.</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Times New Roman""><br>
Oh, I see... yes, the existing tree matching logic is complete nonsense. It somehow manages to completely ignore N1, which is where half the value is supposed to come from.<br>
<br>
-Eli<br>
<br>
<br>
<o:p></o:p></span></p>
<pre>-- <o:p></o:p></pre>
<pre>Employee of Qualcomm Innovation Center, Inc.<o:p></o:p></pre>
<pre>Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project<o:p></o:p></pre>
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