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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - SyncDependenceAnalysis: Crash on loop with split block"
href="https://bugs.llvm.org/show_bug.cgi?id=42473">42473</a>
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<th>Summary</th>
<td>SyncDependenceAnalysis: Crash on loop with split block
</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>
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<th>OS</th>
<td>Windows NT
</td>
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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>
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<th>Component</th>
<td>Scalar Optimizations
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>pjcoup@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<pre>Created <span class=""><a href="attachment.cgi?id=22176" name="attach_22176" title="SyncDependenceAnalysis crash">attachment 22176</a> <a href="attachment.cgi?id=22176&action=edit" title="SyncDependenceAnalysis crash">[details]</a></span>
SyncDependenceAnalysis crash
Compare the attached r0.ll (working) and r1.ll (exposes crash):
Reproduce with opt -mtriple amdgcn-unknown-amdhsa -analyze -divergence
-use-gpu-divergence-analysis r1.ll
--- r0.ll 2019-07-01 15:17:57.372404000 -0700
+++ r1.ll 2019-07-01 15:16:57.458441000 -0700
@@ -26,7 +26,7 @@
br label %while.end
while.body:
- %i.026 = phi i32 [ %inc, %if.end ], [ 0, %while.body.preheader ]
+ %i.026 = phi i32 [ %inc, %if.end.while.body_crit_edge ], [ 0,
%while.body.preheader ]
%call3 = tail call i32 @gf1(i32 0) #4
%cmp4 = icmp ult i32 %call3, 10
%arrayidx6 = getelementptr inbounds i32, i32 addrspace(4)* %A, i32 %i.026
@@ -50,7 +50,10 @@
store i32 %storemerge, i32 addrspace(4)* %arrayidx10, align 4
%inc = add nuw nsw i32 %i.026, 1
%exitcond = icmp ne i32 %inc, %0
- br i1 %exitcond, label %while.body, label %while.end.loopexit
+ br i1 %exitcond, label %if.end.while.body_crit_edge, label
%while.end.loopexit
+
+if.end.while.body_crit_edge:
+ br label %while.body</pre>
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