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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 - opt crashes with "opt -inline -early-cse-memssa -jump-threading -early-cse-memssa -lcssa -loop-rotate": Assertion `L->isRecursivelyLCSSAForm(*DT, *LI) && "Requested to preserve LCSSA, but it's already broken."' failed."
href="https://bugs.llvm.org/show_bug.cgi?id=40841">40841</a>
</td>
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<tr>
<th>Summary</th>
<td>opt crashes with "opt -inline -early-cse-memssa -jump-threading -early-cse-memssa -lcssa -loop-rotate": Assertion `L->isRecursivelyLCSSAForm(*DT, *LI) && "Requested to preserve LCSSA, but it's already broken."' 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=21510" name="attach_21510" title=".bc file of the source code">attachment 21510</a> <a href="attachment.cgi?id=21510&action=edit" title=".bc file of the source code">[details]</a></span>
.bc file of the source code
$clang -v
clang version 9.0.0 (trunk 354742)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/jack-zhou/Documents/llvm/llvm_truck/llvm/build2/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/7.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.3.0
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
$clang -O3 -c -emit-llvm -mllvm -disable-llvm-optzns small.c -o small.bc
-I"path to csmith's runtime"
$ opt -inline -early-cse-memssa -jump-threading -early-cse-memssa -lcssa
-loop-rotate small.bc -o small-opt.bc
opt:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/lib/Transforms/Utils/LoopSimplify.cpp:693:
bool llvm::simplifyLoop(llvm::Loop*, llvm::DominatorTree*, llvm::LoopInfo*,
llvm::ScalarEvolution*, llvm::AssumptionCache*, bool): Assertion
`L->isRecursivelyLCSSAForm(*DT, *LI) && "Requested to preserve LCSSA, but it's
already broken."' failed.
Stack dump:
0. Program arguments:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/build2/bin/opt -inline
-early-cse-memssa -jump-threading -early-cse-memssa -lcssa -loop-rotate
crash331-reduced0.bc
1. Running pass 'CallGraph Pass Manager' on module 'crash331-reduced0.bc'.
2. Running pass 'Canonicalize natural loops' on function '@k'
#0 0x00005561c4e62b7b llvm::sys::PrintStackTrace(llvm::raw_ostream&)
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/lib/Support/Unix/Signals.inc:494:0
#1 0x00005561c4e62c0e PrintStackTraceSignalHandler(void*)
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/lib/Support/Unix/Signals.inc:558:0
#2 0x00005561c4e60b92 llvm::sys::RunSignalHandlers()
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/lib/Support/Signals.cpp:68:0
#3 0x00005561c4e6259d SignalHandler(int)
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/lib/Support/Unix/Signals.inc:357:0
#4 0x00007f1e47c5d890 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x12890)
#5 0x00007f1e4690fe97 gsignal
/build/glibc-OTsEL5/glibc-2.27/signal/../sysdeps/unix/sysv/linux/raise.c:51:0
#6 0x00007f1e46911801 abort /build/glibc-OTsEL5/glibc-2.27/stdlib/abort.c:81:0
#7 0x00007f1e4690139a __assert_fail_base
/build/glibc-OTsEL5/glibc-2.27/assert/assert.c:89:0
#8 0x00007f1e46901412 (/lib/x86_64-linux-gnu/libc.so.6+0x30412)
#9 0x00005561c4ef460b llvm::simplifyLoop(llvm::Loop*, llvm::DominatorTree*,
llvm::LoopInfo*, llvm::ScalarEvolution*, llvm::AssumptionCache*, bool)
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/lib/Transforms/Utils/LoopSimplify.cpp:692:0
#10 0x00005561c4ef4b22 (anonymous
namespace)::LoopSimplify::runOnFunction(llvm::Function&)
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/lib/Transforms/Utils/LoopSimplify.cpp:779:0
#11 0x00005561c45e31fc llvm::FPPassManager::runOnFunction(llvm::Function&)
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/lib/IR/LegacyPassManager.cpp:1643:0
#12 0x00005561c3c82e33 (anonymous
namespace)::CGPassManager::RunPassOnSCC(llvm::Pass*, llvm::CallGraphSCC&,
llvm::CallGraph&, bool&, bool&)
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/lib/Analysis/CallGraphSCCPass.cpp:177:0
#13 0x00005561c3c83e4d (anonymous
namespace)::CGPassManager::RunAllPassesOnSCC(llvm::CallGraphSCC&,
llvm::CallGraph&, bool&)
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/lib/Analysis/CallGraphSCCPass.cpp:441:0
#14 0x00005561c3c8419a (anonymous
namespace)::CGPassManager::runOnModule(llvm::Module&)
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/lib/Analysis/CallGraphSCCPass.cpp:497:0
#15 0x00005561c45e3844 (anonymous
namespace)::MPPassManager::runOnModule(llvm::Module&)
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/lib/IR/LegacyPassManager.cpp:1743:0
#16 0x00005561c45e3fd3 llvm::legacy::PassManagerImpl::run(llvm::Module&)
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/lib/IR/LegacyPassManager.cpp:1856:0
#17 0x00005561c45e41c5 llvm::legacy::PassManager::run(llvm::Module&)
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/lib/IR/LegacyPassManager.cpp:1888:0
#18 0x00005561c284115f main
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/tools/opt/opt.cpp:862:0
#19 0x00007f1e468f2b97 __libc_start_main
/build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:344:0
#20 0x00005561c2802cba _start
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm/build2/bin/opt+0x1808cba)
Aborted (core dumped)
The following is the source code of small.c, which is generated by csmith 2.4.0
and reduced by creduce 2.9.0 (eca4f38).
#include "csmith.h"
struct {
int8_t a;
uint16_t b
} c;
d, f;
int8_t e;
static *g(uint16_t, *, h);
k() {
uint16_t l;
g(d, 0, l);
}
*g(uint16_t m, *r, h) {
int i, j;
i = 0;
for (; i < 7;) {
uint32_t n[8];
uint64_t o[] = {};
int16_t p[4];
int16_t q = p;
int16_t s[3];
int64_t t[] = {};
int32_t aa[5];
s[i] = &q;
for (; i; i++)
aa;
for (c.a = 0; c.a <= 0;)
if (a(n, m)) {
int32_t ac[1];
return ac;
}
}
uint16_t ad;
for (;;) {
uint16_t *ae;
ae[j] = &ad;
for (e = 0; e < 0; e = safe_sub_func_int8_t_s_s)
if (safe_rshift_func_int8_t_s_s(safe_div_func_uint32_t_u_u, m))
return f;
if (h = m)
for (c.b = 0;;)
return e;
}
}</pre>
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