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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Invalid PPC CTR loop with 128bit integers"
href="https://bugs.llvm.org/show_bug.cgi?id=32485">32485</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Invalid PPC CTR loop with 128bit integers
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>4.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</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>Backend: PowerPC
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>mail@timnn.me
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Compiling the below IR with llc -O1 (Debug Assertions enabled, affects at least
LLVM 4.0 & Master) triggers an unreachable:
```
Invalid PPC CTR loop!
UNREACHABLE executed at
/home/logic/build-tmp/llvm-master/src/lib/Target/PowerPC/PPCCTRLoops.cpp:722!
[...]
0. Program arguments: ../../../../../llvm-master/build/bin/llc -O1
core.red-4.ll
1. Running pass 'Function Pass Manager' on module 'core.red-4.ll'.
2. Running pass 'PowerPC CTR Loops Verify' on function '@_Crash_Fn'
```
IR:
```
; ModuleID = 'bugpoint-reduced-simplified.bc'
source_filename = "bugpoint-output-7eb0c3b.bc"
target datalayout = "E-m:e-i64:64-n32:64"
target triple = "powerpc64-unknown-linux-gnu"
; Function Attrs: uwtable
define fastcc void @_Crash_Fn() unnamed_addr #0 {
entry-block:
br label %_Label_0
_Label_0: ; preds = %_Label_0,
%entry-block
%result.0138 = phi i128 [ %5, %_Label_0 ], [ 0, %entry-block ]
%iter.sroa.0.0137 = phi i8* [ %0, %_Label_0 ], [ undef, %entry-block ]
%0 = getelementptr inbounds i8, i8* %iter.sroa.0.0137, i64 1
%1 = tail call { i128, i1 } @llvm.smul.with.overflow.i128(i128 %result.0138,
i128 undef) #2
%2 = extractvalue { i128, i1 } %1, 0
%3 = tail call { i128, i1 } @llvm.sadd.with.overflow.i128(i128 %2, i128 0) #2
%4 = extractvalue { i128, i1 } %3, 1
%5 = extractvalue { i128, i1 } %3, 0
%6 = icmp eq i8* %0, null
br i1 %6, label %bb66.loopexit, label %_Label_0
bb66.loopexit: ; preds = %_Label_0
unreachable
}
; Function Attrs: nounwind readnone
declare { i128, i1 } @llvm.sadd.with.overflow.i128(i128, i128) #1
; Function Attrs: nounwind readnone
declare { i128, i1 } @llvm.smul.with.overflow.i128(i128, i128) #1
attributes #0 = { uwtable }
attributes #1 = { nounwind readnone }
attributes #2 = { nounwind }
```</pre>
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