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<body><span class="vcard"><a class="email" href="mailto:igor@azulsystems.com" title="Igor Laevsky <igor@azulsystems.com>"> <span class="fn">Igor Laevsky</span></a>
</span> changed
<a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED --- - A very small test resulting in extremely long compilation in "clang -O2" version 3.5, trunk 199677"
href="https://llvm.org/bugs/show_bug.cgi?id=18606">bug 18606</a>
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<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">Status</td>
<td>RESOLVED
</td>
<td>REOPENED
</td>
</tr>
<tr>
<td style="text-align:right;">CC</td>
<td>
</td>
<td>igor@azulsystems.com
</td>
</tr>
<tr>
<td style="text-align:right;">Resolution</td>
<td>FIXED
</td>
<td>---
</td>
</tr></table>
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<b><a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED --- - A very small test resulting in extremely long compilation in "clang -O2" version 3.5, trunk 199677"
href="https://llvm.org/bugs/show_bug.cgi?id=18606#c8">Comment # 8</a>
on <a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED --- - A very small test resulting in extremely long compilation in "clang -O2" version 3.5, trunk 199677"
href="https://llvm.org/bugs/show_bug.cgi?id=18606">bug 18606</a>
from <span class="vcard"><a class="email" href="mailto:igor@azulsystems.com" title="Igor Laevsky <igor@azulsystems.com>"> <span class="fn">Igor Laevsky</span></a>
</span></b>
<pre>This issue is still reproducible on this IR:
define i32 @test(i32, i32) {
bci_0:
br label %bci_30
bci_68: ; preds = %bci_45
%local_6_.lcssa = phi i32 [ %local_6_, %bci_45 ]
%.lcssa1.lcssa = phi i32 [ %37, %bci_45 ]
%.lcssa.lcssa = phi i32 [ 34, %bci_45 ]
%2 = add i32 %local_6_.lcssa, 262
%3 = add i32 %2, %.lcssa1.lcssa
%4 = add i32 %3, %.lcssa.lcssa
ret i32 %4
bci_30: ; preds = %bci_45, %bci_0
%local_0_ = phi i32 [ %0, %bci_0 ], [ %38, %bci_45 ]
%local_6_ = phi i32 [ 2, %bci_0 ], [ %39, %bci_45 ]
%5 = add i32 %local_6_, %local_0_
br label %bci_45
bci_45: ; preds = %bci_30
%6 = mul i32 %5, %5
%7 = mul i32 %6, %6
%8 = mul i32 %7, %7
%9 = mul i32 %8, %8
%10 = mul i32 %9, %9
%11 = mul i32 %10, %10
%12 = mul i32 %11, %11
%13 = mul i32 %12, %12
%14 = mul i32 %13, %13
%15 = mul i32 %14, %14
%16 = mul i32 %15, %15
%17 = mul i32 %16, %16
%18 = mul i32 %17, %17
%19 = mul i32 %18, %18
%20 = mul i32 %19, %19
%21 = mul i32 %20, %20
%22 = mul i32 %21, %21
%23 = mul i32 %22, %22
%24 = mul i32 %23, %23
%25 = mul i32 %24, %24
%26 = mul i32 %25, %25
%27 = mul i32 %26, %26
%28 = mul i32 %27, %27
%29 = mul i32 %28, %28
%30 = mul i32 %29, %29
%31 = mul i32 %30, %30
%32 = mul i32 %31, %31
%33 = mul i32 %32, %32
%34 = mul i32 %33, %33
%35 = mul i32 %34, %34
%36 = mul i32 %35, %35
%37 = mul i32 %36, %36
%38 = add i32 %37, -11
%39 = add i32 %local_6_, 1
%40 = icmp sgt i32 %39, 76
br i1 %40, label %bci_68, label %bci_30
}
I suspect this might be because we don't cash results inside of the
"ScalarEvolution::GetMinTrailingZeros"</pre>
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