[llvm-bugs] [Bug 42268] New: partial-inliner pass crashes with "opt -mem2reg -loop-rotate -loop-unswitch -jump-threading -partial-inliner": Assertion `OutlinedFunctionCost >= Cloner.OutlinedRegionCost && "Outlined function cost should be no less than the outlined region"' failed.

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=42268

            Bug ID: 42268
           Summary: partial-inliner pass crashes with "opt -mem2reg
                    -loop-rotate -loop-unswitch -jump-threading
                    -partial-inliner": Assertion `OutlinedFunctionCost >=
                    Cloner.OutlinedRegionCost && "Outlined function cost
                    should be no less than the outlined region"' failed.
           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 22091
  --> https://bugs.llvm.org/attachment.cgi?id=22091&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 -loop-rotate -loop-unswitch -jump-threading -partial-inliner
small.bc -o small-opt.bc
opt:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/lib/Transforms/IPO/PartialInlining.cpp:905:
std::tuple<int, int>
{anonymous}::PartialInlinerImpl::computeOutliningCosts({anonymous}::PartialInlinerImpl::FunctionCloner&):
Assertion `OutlinedFunctionCost >= Cloner.OutlinedRegionCost && "Outlined
function cost should be no less than the outlined region"' failed.
Stack dump:
0.      Program arguments:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/bin/opt -mem2reg
-loop-rotate -loop-unswitch -jump-threading -partial-inliner small.bc -o
small-opt.bc 
1.      Running pass 'Partial Inliner' on module 'small.bc'.
 #0 0x0000563ec72a3cea llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/bin/opt+0x255bcea)
 #1 0x0000563ec72a19a4 llvm::sys::RunSignalHandlers()
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/bin/opt+0x25599a4)
 #2 0x0000563ec72a1ae2 SignalHandler(int)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/bin/opt+0x2559ae2)
 #3 0x00007fb62a2c4890 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x12890)
 #4 0x00007fb628f76e97 raise
/build/glibc-OTsEL5/glibc-2.27/signal/../sysdeps/unix/sysv/linux/raise.c:51:0
 #5 0x00007fb628f78801 abort /build/glibc-OTsEL5/glibc-2.27/stdlib/abort.c:81:0
 #6 0x00007fb628f6839a __assert_fail_base
/build/glibc-OTsEL5/glibc-2.27/assert/assert.c:89:0
 #7 0x00007fb628f68412 (/lib/x86_64-linux-gnu/libc.so.6+0x30412)
 #8 0x0000563ec6d7d4f5 (anonymous
namespace)::PartialInlinerImpl::tryPartialInline((anonymous
namespace)::PartialInlinerImpl::FunctionCloner&) (.part.567)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/bin/opt+0x20354f5)
 #9 0x0000563ec6d7ffd6 (anonymous
namespace)::PartialInlinerImpl::run(llvm::Module&) (.part.583)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/bin/opt+0x2037fd6)
#10 0x0000563ec6d808b5 (anonymous
namespace)::PartialInlinerLegacyPass::runOnModule(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/bin/opt+0x20388b5)
#11 0x0000563ec6c601c1 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/bin/opt+0x1f181c1)
#12 0x0000563ec555a889 main
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/bin/opt+0x812889)
#13 0x00007fb628f59b97 __libc_start_main
/build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:344:0
#14 0x0000563ec55deaba _start
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/bin/opt+0x896aba)
Aborted (core dumped)

---------------------------------
char a;
void b() {
  int c = 8;
  for (; a;)
    if (c)
      ;
}
void d() { b(); }

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