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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 - licm crashes: Assertion `L->isLCSSAForm(*DT) && "Loop is not in LCSSA form."' failed."
href="https://bugs.llvm.org/show_bug.cgi?id=43176">43176</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>licm crashes: Assertion `L->isLCSSAForm(*DT) && "Loop is not in LCSSA form."' failed.
</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>Scalar Optimizations
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>cszide@163.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=22452" name="attach_22452" title=".bc file of the source code">attachment 22452</a> <a href="attachment.cgi?id=22452&action=edit" title=".bc file of the source code">[details]</a></span>
.bc file of the source code
$clang -v
clang version 10.0.0 (trunk 370163)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build6/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.4.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.4.0
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
$clang -O3 -c -emit-llvm -femit-all-decls -mllvm -disable-llvm-optzns small.c
$opt -loop-rotate -break-crit-edges -mem2reg -loop-reduce -loop-rotate -ipsccp
-licm -loop-interchange -licm small.bc -o small-opt.bc
opt:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/lib/Transforms/Scalar/LICM.cpp:331:
bool {anonymous}::LoopInvariantCodeMotion::runOnLoop(llvm::Loop*,
llvm::AliasAnalysis*, llvm::LoopInfo*, llvm::DominatorTree*,
llvm::TargetLibraryInfo*, llvm::TargetTransformInfo*, llvm::ScalarEvolution*,
llvm::MemorySSA*, llvm::OptimizationRemarkEmitter*, bool): Assertion
`L->isLCSSAForm(*DT) && "Loop is not in LCSSA form."' failed.
Stack dump:
0. Program arguments:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build6/bin/opt -loop-rotate
-break-crit-edges -mem2reg -loop-reduce -loop-rotate -ipsccp -licm
-loop-interchange -licm small.bc -o small-opt.bc
1. Running pass 'Function Pass Manager' on module 'small.bc'.
2. Running pass 'Loop Pass Manager' on function '@d'
3. Running pass 'Loop Invariant Code Motion' on basic block '%for.body'
#0 0x0000564f5ddf07fa llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build6/bin/opt+0x27277fa)
#1 0x0000564f5ddee4d4 llvm::sys::RunSignalHandlers()
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build6/bin/opt+0x27254d4)
#2 0x0000564f5ddee612 SignalHandler(int)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build6/bin/opt+0x2725612)
#3 0x00007f4344101890 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x12890)
#4 0x00007f4342db3e97 raise
/build/glibc-OTsEL5/glibc-2.27/signal/../sysdeps/unix/sysv/linux/raise.c:51:0
#5 0x00007f4342db5801 abort /build/glibc-OTsEL5/glibc-2.27/stdlib/abort.c:81:0
#6 0x00007f4342da539a __assert_fail_base
/build/glibc-OTsEL5/glibc-2.27/assert/assert.c:89:0
#7 0x00007f4342da5412 (/lib/x86_64-linux-gnu/libc.so.6+0x30412)
#8 0x0000564f5dbb988f (anonymous
namespace)::LoopInvariantCodeMotion::runOnLoop(llvm::Loop*, llvm::AAResults*,
llvm::LoopInfo*, llvm::DominatorTree*, llvm::TargetLibraryInfo*,
llvm::TargetTransformInfo*, llvm::ScalarEvolution*, llvm::MemorySSA*,
llvm::OptimizationRemarkEmitter*, bool)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build6/bin/opt+0x24f088f)
#9 0x0000564f5dbb9c3a (anonymous
namespace)::LegacyLICMPass::runOnLoop(llvm::Loop*, llvm::LPPassManager&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build6/bin/opt+0x24f0c3a)
#10 0x0000564f5d0f0ceb llvm::LPPassManager::runOnFunction(llvm::Function&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build6/bin/opt+0x1a27ceb)
#11 0x0000564f5d74d909 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build6/bin/opt+0x2084909)
#12 0x0000564f5d74da01 llvm::FPPassManager::runOnModule(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build6/bin/opt+0x2084a01)
#13 0x0000564f5d74cb61 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build6/bin/opt+0x2083b61)
#14 0x0000564f5bf4a32f main
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build6/bin/opt+0x88132f)
#15 0x00007f4342d96b97 __libc_start_main
/build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:344:0
#16 0x0000564f5bfc0b7a _start
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build6/bin/opt+0x8f7b7a)
Aborted (core dumped)
By using bugpoint, the optimization sequences can be further reduced.
$opt bugpoint-reduced-simplified.bc -loop-interchange -licm
opt:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/lib/Transforms/Scalar/LICM.cpp:331:
bool {anonymous}::LoopInvariantCodeMotion::runOnLoop(llvm::Loop*,
llvm::AliasAnalysis*, llvm::LoopInfo*, llvm::DominatorTree*,
llvm::TargetLibraryInfo*, llvm::TargetTransformInfo*, llvm::ScalarEvolution*,
llvm::MemorySSA*, llvm::OptimizationRemarkEmitter*, bool): Assertion
`L->isLCSSAForm(*DT) && "Loop is not in LCSSA form."' failed.
Stack dump:
0. Program arguments:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build6/bin/opt
bugpoint-reduced-simplified.bc -loop-interchange -licm
1. Running pass 'Function Pass Manager' on module
'bugpoint-reduced-simplified.bc'.
2. Running pass 'Loop Pass Manager' on function '@d'
3. Running pass 'Loop Invariant Code Motion' on basic block '%for.body'
#0 0x000055b1839db7fa llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build6/bin/opt+0x27277fa)
#1 0x000055b1839d94d4 llvm::sys::RunSignalHandlers()
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build6/bin/opt+0x27254d4)
#2 0x000055b1839d9612 SignalHandler(int)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build6/bin/opt+0x2725612)
#3 0x00007f905c353890 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x12890)
#4 0x00007f905b005e97 raise
/build/glibc-OTsEL5/glibc-2.27/signal/../sysdeps/unix/sysv/linux/raise.c:51:0
#5 0x00007f905b007801 abort /build/glibc-OTsEL5/glibc-2.27/stdlib/abort.c:81:0
#6 0x00007f905aff739a __assert_fail_base
/build/glibc-OTsEL5/glibc-2.27/assert/assert.c:89:0
#7 0x00007f905aff7412 (/lib/x86_64-linux-gnu/libc.so.6+0x30412)
#8 0x000055b1837a488f (anonymous
namespace)::LoopInvariantCodeMotion::runOnLoop(llvm::Loop*, llvm::AAResults*,
llvm::LoopInfo*, llvm::DominatorTree*, llvm::TargetLibraryInfo*,
llvm::TargetTransformInfo*, llvm::ScalarEvolution*, llvm::MemorySSA*,
llvm::OptimizationRemarkEmitter*, bool)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build6/bin/opt+0x24f088f)
#9 0x000055b1837a4c3a (anonymous
namespace)::LegacyLICMPass::runOnLoop(llvm::Loop*, llvm::LPPassManager&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build6/bin/opt+0x24f0c3a)
#10 0x000055b182cdbceb llvm::LPPassManager::runOnFunction(llvm::Function&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build6/bin/opt+0x1a27ceb)
#11 0x000055b183338909 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build6/bin/opt+0x2084909)
#12 0x000055b183338a01 llvm::FPPassManager::runOnModule(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build6/bin/opt+0x2084a01)
#13 0x000055b183337b61 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build6/bin/opt+0x2083b61)
#14 0x000055b181b3532f main
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build6/bin/opt+0x88132f)
#15 0x00007f905afe8b97 __libc_start_main
/build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:344:0
#16 0x000055b181babb7a _start
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build6/bin/opt+0x8f7b7a)
Aborted (core dumped)
-------------------------------------------------------------
int a, c;
int b[5];
void d() {
for (; a; a++) {
int e = 0;
for (; e < 4; e++)
;
b[a] &= c;
}
}</pre>
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