A DESCRIPTION OF THE PROBLEM :
JVM crashes under JDK8 when running the test with JVM args -Xcomp -XX:LoopOptsCount=5.

Reproduce (minimal test case on JDK 8 fastdebug):

$ javac Reduced.java && java -Xcomp -XX:LoopOptsCount=5 Reduced
Default case invoked for:
   opcode = 154, "LoopLimit"
o401 LoopLimit === _ o647 o373 [[o305 66 ]]

--N: o401 LoopLimit === _ o647 o373 [[o305 66 ]]

   --N: o647 Binary === _ o315 o22 [[o401 ]]
   _Binary_rRegI_rRegI 100 _Binary_rRegI_rRegI
   _Binary_rax_RegI_rRegI 100 _Binary_rax_RegI_rRegI

      --N: o315 CastII === o397 o293 [[o647 ]] #int:>=2:www carry dependency
      RREGI 0 castII
      RAX_REGI 0 castII
      RBX_REGI 0 castII
      RCX_REGI 0 castII
      RDX_REGI 0 castII
      RDI_REGI 0 castII
      NO_RCX_REGI 0 castII
      NO_RAX_RDX_REGI 0 castII
      STACKSLOTI 100 storeSSI

         --N: o293 AddI === _ o297 o61 [[o292 o297 o305 o310 o315 10 13 ]]
         RREGI 0 RREGI
         RAX_REGI 0 RAX_REGI
         RBX_REGI 0 RBX_REGI
         RCX_REGI 0 RCX_REGI
         RDX_REGI 0 RDX_REGI
         RDI_REGI 0 RDI_REGI
         NO_RCX_REGI 0 NO_RCX_REGI
         NO_RAX_RDX_REGI 0 NO_RAX_RDX_REGI
         STACKSLOTI 100 storeSSI

      --N: o22 ConI === o0 [[o58 o633 o632 o651 o629 o298 o290 o624 o625 o153 o154 o679 o649 o681 o260 o486 o482 o653 o628 o647 o256 o404 o405 o407 o408 o683 o436 o441 o442 o485 o445 o521 o522 o524 o525 o677 o675 o555 o556 o558 o559 o561 o562 o564 o565 o673 o671 o669 o667 o310 o665 o604 o605 o663 o608 o609 o661 o612 o613 o659 o616 o617 o657 o620 o621 o655 24 ]] #int:1
      IMMI 10 IMMI
      IMMI1 0 IMMI1
      IMMI2 0 IMMI2
      IMMI8 5 IMMI8
      IMMI16 10 IMMI16
      IMMU31 0 IMMU31
      RREGI 100 loadConI
      RAX_REGI 100 loadConI
      RBX_REGI 100 loadConI
      RCX_REGI 100 loadConI
      RDX_REGI 100 loadConI
      RDI_REGI 100 loadConI
      NO_RCX_REGI 100 loadConI
      NO_RAX_RDX_REGI 100 loadConI
      STACKSLOTI 200 storeSSI

   --N: o373 ConI === o0 [[o401 ]] #int:-2
   IMMI 10 IMMI
   IMMI8 5 IMMI8
   IMMI16 10 IMMI16
   RREGI 100 loadConI
   RAX_REGI 100 loadConI
   RBX_REGI 100 loadConI
   RCX_REGI 100 loadConI
   RDX_REGI 100 loadConI
   RDI_REGI 100 loadConI
   NO_RCX_REGI 100 loadConI
   NO_RAX_RDX_REGI 100 loadConI
   STACKSLOTI 200 storeSSI

# To suppress the following error report, specify this argument
# after -XX: or in .hotspotrc: SuppressErrorAt=/matcher.cpp:1592
#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error ((...)/hotspot/src/share/vm/opto/matcher.cpp:1592), pid=171120, tid=0x00007f84decf5700
# assert(false) failed: bad AD file
#
# JRE version: Java(TM) SE Runtime Environment (8.0_291-b94) (build 1.8.0_291-fastdebug-b94)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (25.291-b94-fastdebug compiled mode linux-amd64 compressed oops)

Reproduce (larger test case):
$ java -Xcomp -XX:LoopOptsCount=5 Test
#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/home/user/jdk_source/jdk8u/hotspot/src/share/vm/opto/matcher.cpp:1592), pid=85165, tid=0x00007f25d9545700
# assert(false) failed: bad AD file
#
# JRE version: OpenJDK Runtime Environment (8.0) (build 1.8.0-internal-fastdebug-user_2022_03_11_16_03-b00)
# Java VM: OpenJDK 64-Bit Server VM (25.71-b00-fastdebug compiled mode linux-amd64 compressed oops)
# Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
#
--------------- T H R E A D ---------------

Current thread (0x00007f26ac20c000): JavaThread "C2 CompilerThread3" daemon [_thread_in_native, id=85243, stack(0x00007f25d9446000,0x00007f25d9546000)]

Stack: [0x00007f25d9446000,0x00007f25d9546000], sp=0x00007f25d9541010, free space=1004k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0x121fcac] VMError::report_and_die()+0x2ec
V [libjvm.so+0x797f81] report_vm_error(char const*, int, char const*, char const*)+0x61
V [libjvm.so+0xdf3a49] Matcher::Label_Root(Node const*, State*, Node*, Node const*)+0x5c9
V [libjvm.so+0xdf3e09] Matcher::match_tree(Node const*)+0x229
V [libjvm.so+0xdf65da] Matcher::xform(Node*, int)+0x93a
V [libjvm.so+0xdfa303] Matcher::match()+0xca3
V [libjvm.so+0x6fb0c2] Compile::Code_Gen()+0x82
V [libjvm.so+0x6feac4] Compile::Compile(ciEnv*, C2Compiler*, ciMethod*, int, bool, bool, bool)+0xf04
V [libjvm.so+0x59ba70] C2Compiler::compile_method(ciEnv*, ciMethod*, int)+0xe0
V [libjvm.so+0x70bdf2] CompileBroker::invoke_compiler_on_method(CompileTask*)+0x8b2
V [libjvm.so+0x70d3e0] CompileBroker::compiler_thread_loop()+0x710
V [libjvm.so+0x118b188] JavaThread::thread_main_inner()+0x1c8
V [libjvm.so+0x118b54d] JavaThread::run()+0x37d
V [libjvm.so+0xf19ca2] java_start(Thread*)+0x102
C [libpthread.so.0+0x76db] start_thread+0xdb


Current CompileTask:
C2: 4032 1033 b 4 Test::mainTest (777 bytes)


---------- BEGIN SOURCE ----------
Download TestLoopOptsCount.zip from:
<link>
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