[llvm-bugs] [Bug 42274] New: loop-instsimplify pass crashes with "opt -mem2reg -partial-inliner -loop-unswitch -loop-rotate -loop-reduce -loop-unswitch -jump-threading -slsr -loop-instsimplify": Assertion `(L.contains(UserI) || isa<PHINode>(UserI)) && "Uses outside the loop should be
via llvm-bugs
llvm-bugs at lists.llvm.org
Thu Jun 13 17:43:38 PDT 2019
https://bugs.llvm.org/show_bug.cgi?id=42274
Bug ID: 42274
Summary: loop-instsimplify pass crashes with "opt -mem2reg
-partial-inliner -loop-unswitch -loop-rotate
-loop-reduce -loop-unswitch -jump-threading -slsr
-loop-instsimplify": Assertion `(L.contains(UserI) ||
isa<PHINode>(UserI)) && "Uses outside the loop should
be
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: unassignedbugs at nondot.org
Reporter: cszide at 163.com
CC: llvm-bugs at lists.llvm.org
Created attachment 22097
--> https://bugs.llvm.org/attachment.cgi?id=22097&action=edit
.bc file of the source code
$clang -v
clang version 9.0.0 (trunk 362492)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/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 -mllvm -disable-llvm-optzns small.c
$opt -mem2reg -partial-inliner -loop-unswitch -loop-rotate -loop-reduce
-loop-unswitch -jump-threading -slsr -loop-instsimplify small.bc -o
small-opt.bc
opt:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/lib/Transforms/Scalar/LoopInstSimplify.cpp:131:
bool simplifyLoopInst(llvm::Loop&, llvm::DominatorTree&, llvm::LoopInfo&,
llvm::AssumptionCache&, const llvm::TargetLibraryInfo&,
llvm::MemorySSAUpdater*): Assertion `(L.contains(UserI) || isa<PHINode>(UserI))
&& "Uses outside the loop should be PHI nodes due to LCSSA!"' failed.
Stack dump:
0. Program arguments:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/bin/opt -mem2reg
-partial-inliner -loop-unswitch -loop-rotate -loop-reduce -loop-unswitch
-jump-threading -slsr -loop-instsimplify small.bc -o small-opt.bc
1. Running pass 'Function Pass Manager' on module 'small.bc'.
2. Running pass 'Loop Pass Manager' on function '@main'
3. Running pass 'Simplify instructions in loops' on basic block
'%for.body'
#0 0x0000563f3f97bcea llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/bin/opt+0x255bcea)
#1 0x0000563f3f9799a4 llvm::sys::RunSignalHandlers()
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/bin/opt+0x25599a4)
#2 0x0000563f3f979ae2 SignalHandler(int)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/bin/opt+0x2559ae2)
#3 0x00007fc72c0f1890 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x12890)
#4 0x00007fc72ada3e97 raise
/build/glibc-OTsEL5/glibc-2.27/signal/../sysdeps/unix/sysv/linux/raise.c:51:0
#5 0x00007fc72ada5801 abort /build/glibc-OTsEL5/glibc-2.27/stdlib/abort.c:81:0
#6 0x00007fc72ad9539a __assert_fail_base
/build/glibc-OTsEL5/glibc-2.27/assert/assert.c:89:0
#7 0x00007fc72ad95412 (/lib/x86_64-linux-gnu/libc.so.6+0x30412)
#8 0x0000563f3f77669a simplifyLoopInst(llvm::Loop&, llvm::DominatorTree&,
llvm::LoopInfo&, llvm::AssumptionCache&, llvm::TargetLibraryInfo const&,
llvm::MemorySSAUpdater*)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/bin/opt+0x235669a)
#9 0x0000563f3f77834b (anonymous
namespace)::LoopInstSimplifyLegacyPass::runOnLoop(llvm::Loop*,
llvm::LPPassManager&) (.part.112)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/bin/opt+0x235834b)
#10 0x0000563f3ecf86fb llvm::LPPassManager::runOnFunction(llvm::Function&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/bin/opt+0x18d86fb)
#11 0x0000563f3f338f69 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/bin/opt+0x1f18f69)
#12 0x0000563f3f339061 llvm::FPPassManager::runOnModule(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/bin/opt+0x1f19061)
#13 0x0000563f3f3381c1 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/bin/opt+0x1f181c1)
#14 0x0000563f3dc32889 main
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/bin/opt+0x812889)
#15 0x00007fc72ad86b97 __libc_start_main
/build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:344:0
#16 0x0000563f3dcb6aba _start
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/bin/opt+0x896aba)
Aborted (core dumped)
without loop-instsimplify pass, opt works fine.
$opt -mem2reg -partial-inliner -loop-unswitch -loop-rotate -loop-reduce
-loop-unswitch -jump-threading -slsr small.bc -o small-opt.bc
------------------------------------------------------------
int a[7][10][3];
int f;
void main() {
int b, c, d, e = 0;
if (f)
e = 1;
b = 0;
for (; b < 1; b++) {
c = 0;
for (; c < 10; c++) {
d = 0;
for (; d < 3; d++) {
a[b][c][d];
if (e)
if (e)
;
}
}
}
}
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