<html>
<head>
<base href="https://bugs.llvm.org/">
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - JumpThreading create instruction that reference its own value"
href="https://bugs.llvm.org/show_bug.cgi?id=37745">37745</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>JumpThreading create instruction that reference its own value
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Scalar Optimizations
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>karl-johan.karlsson@ericsson.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=20412" name="attach_20412" title="Reproducer: opt -jump-threading -verify-each -S -mtriple=x86_64--">attachment 20412</a> <a href="attachment.cgi?id=20412&action=edit" title="Reproducer: opt -jump-threading -verify-each -S -mtriple=x86_64--">[details]</a></span>
Reproducer: opt -jump-threading -verify-each -S -mtriple=x86_64--
$ ./opt -jump-threading -verify-each -S -mtriple=x86_64-- -o -
./jumpthreading.ll -print-after-all -print-before-all
*** IR Dump Before Jump Threading ***
define void @f1() {
entry:
br i1 false, label %lbl1, label %if.end
lbl1: ; preds = %if.end, %entry
%p1.addr.0 = phi i16 [ undef, %entry ], [ %inc, %if.end ]
br label %if.end
if.end: ; preds = %lbl1, %entry
%p1.addr.1 = phi i16 [ %p1.addr.0, %lbl1 ], [ undef, %entry ]
%inc = add nsw i16 %p1.addr.1, 1
%tobool = icmp ne i16 %inc, 0
br i1 %tobool, label %if.end4, label %lbl1
if.end4: ; preds = %if.end
ret void
}
*** IR Dump After Jump Threading ***
define void @f1() {
if.end:
%inc = add nsw i16 undef, 1
%tobool = icmp ne i16 %inc, 0
br i1 %tobool, label %if.end4, label %if.end.thread
if.end.thread: ; preds = %if.end
%inc1 = add nsw i16 %inc1, 1
br label %if.end4
if.end4: ; preds = %if.end.thread,
%if.end
ret void
}
*** IR Dump Before Module Verifier ***
define void @f1() {
if.end:
%inc = add nsw i16 undef, 1
%tobool = icmp ne i16 %inc, 0
br i1 %tobool, label %if.end4, label %if.end.thread
if.end.thread: ; preds = %if.end
%inc1 = add nsw i16 %inc1, 1
br label %if.end4
if.end4: ; preds = %if.end.thread,
%if.end
ret void
}
Only PHI nodes may reference their own value!
%inc1 = add nsw i16 %inc1, 1
LLVM ERROR: Broken function found, compilation aborted!</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>