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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - LICM behaves differently if multiple functions are present."
href="https://bugs.llvm.org/show_bug.cgi?id=38989">38989</a>
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<th>Summary</th>
<td>LICM behaves differently if multiple functions are present.
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Scalar Optimizations
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>alina.sbirlea@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Pulling test12 out of sinking.ll into a separate file makes it behave
differently. The store is hoisted all the way out.
The test in question:
; RUN: opt < %s -basicaa -licm -S | FileCheck %s
; Can't sink stores out of exit blocks containing indirectbr instructions
; because loop simplify does not create dedicated exits for such blocks. Test
; that by sinking the store from lab21 to lab22, but not further.
define void @test12() {
; CHECK-LABEL: @test12
br label %lab4
lab4:
br label %lab20
lab5:
br label %lab20
lab6:
br label %lab4
lab7:
br i1 undef, label %lab8, label %lab13
lab8:
br i1 undef, label %lab13, label %lab10
lab10:
br label %lab7
lab13:
ret void
lab20:
br label %lab21
lab21:
; CHECK: lab21:
; CHECK-NOT: store
; CHECK: br i1 false, label %lab21, label %lab22
store i32 36127957, i32* undef, align 4
br i1 undef, label %lab21, label %lab22
lab22:
; CHECK: lab22:
; CHECK: store
; CHECK-NEXT: indirectbr i8* undef
indirectbr i8* undef, [label %lab5, label %lab6, label %lab7]
}
More strange is that if I paste the test twice (change method name), it behaves
like before (i.e. store sunk to lab22 only).
So there is some info/analysis that's not reset properly and leaks between the
processing of two separate functions.
Cause is between r340927-r341031.</pre>
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