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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Assertion in register allocation on ARM"
href="https://bugs.llvm.org/show_bug.cgi?id=33071">33071</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Assertion in register allocation on ARM
</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>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Backend: ARM
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>yyc1992@gmail.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=18454" name="attach_18454" title="Test case">attachment 18454</a> <a href="attachment.cgi?id=18454&action=edit" title="Test case">[details]</a></span>
Test case
The IR attached causes an assertion in LLC on at least 3.9 and 4.0.
The failure is
```
llc:
/home/yuyichao/projects/julia/tests/master/deps/srccache/llvm-4.0.0/lib/CodeGen/VirtRegMap.cpp:443:
void {anonymous}::VirtRegRewriter::rewrite(): Assertion `PhysReg && "Invalid
SubReg for physical register"' failed.
```
Which is triggered on `%D16<def> = COPY %vreg29:ssub_0<kill>; DPR:%vreg29`.
Enclosing BB
```
400B BB#1: derived from LLVM BB %if
Live Ins: %R4 %R5 %R8 %R9 %S16
Predecessors according to CFG: BB#0
416B %D16<def> = FCONSTD 128, pred:14, pred:%noreg;
dbg:/home/yuyichao/projects/julia/tests/master/script.jl:2
432B %D17<def> = VCVTDS %S16<kill>, pred:14, pred:%noreg;
dbg:/home/yuyichao/projects/julia/tests/master/script.jl:2
448B %D16<def> = VADDD %D17<kill>, %D16<kill>, pred:14, pred:%noreg;
dbg:/home/yuyichao/projects/julia/tests/master/script.jl:2
464B %R10<def>, %R7<def> = VMOVRRD %D16, pred:14, pred:%noreg;
dbg:/home/yuyichao/projects/julia/tests/master/script.jl:2
480B %R0<def> = MOVi 1, pred:14, pred:%noreg, opt:%noreg
512B %D16<def> = COPY %vreg29:ssub_0<kill>; DPR:%vreg29
560B B <BB#4>;
dbg:/home/yuyichao/projects/julia/tests/master/script.jl:2
Successors according to CFG: BB#4(?%)
```
Enclosing BB before `rewrite`
```
BB#1: derived from LLVM BB %if
Live Ins: %R4 %R5 %R8 %R9 %S16
Predecessors according to CFG: BB#0
%vreg27<def> = FCONSTD 128, pred:14, pred:%noreg; DPR:%vreg27
dbg:/home/yuyichao/projects/julia/tests/master/script.jl:2
%vreg28<def> = VCVTDS %vreg17<kill>, pred:14, pred:%noreg; DPR:%vreg28
SPR:%vreg17 dbg:/home/yuyichao/projects/julia/tests/master/script.jl:2
%vreg29<def> = VADDD %vreg28<kill>, %vreg27<kill>, pred:14,
pred:%noreg; DPR:%vreg29,%vreg28,%vreg27
dbg:/home/yuyichao/projects/julia/tests/master/script.jl:2
%vreg6<def>, %vreg5<def> = VMOVRRD %vreg29, pred:14, pred:%noreg;
GPR:%vreg6,%vreg5 DPR:%vreg29
dbg:/home/yuyichao/projects/julia/tests/master/script.jl:2
%vreg72<def> = MOVi 1, pred:14, pred:%noreg, opt:%noreg; GPR:%vreg72
%vreg67<def> = COPY %vreg29:ssub_0<kill>; DPR:%vreg67,%vreg29
B <BB#4>; dbg:/home/yuyichao/projects/julia/tests/master/script.jl:2
Successors according to CFG: BB#4(?%)
```
Ref <a href="https://github.com/JuliaLang/julia/issues/21926">https://github.com/JuliaLang/julia/issues/21926</a></pre>
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