Missed Identity optimization:
Old node:
dist dump
---------------------------------------------
   1 1240 ConvL2D === _ 1246 [[ 1233 1231 1245 942 1243 885 ]] #double !orig=[886],[715],[228],502 !jvms: Test::vMeth1 @ bci:71 (line 31)
   0 885 ConvD2L === _ 1240 [[ 873 ]] #long !orig=[714],[368] !jvms: Test::vMeth1 @ bci:138 (line 37)
New node:
dist dump
---------------------------------------------
   1 1245 Phi === 880 1241 1240 [[ 1246 ]] #double !orig=[1239],[886],[715],[228],502 !jvms: Test::vMeth1 @ bci:71 (line 31)
   0 1246 ConvD2L === _ 1245 [[ 1240 ]] #long !orig=[1239],[886],[715],[228],502 !jvms: Test::vMeth1 @ bci:71 (line 31)

#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (c:\sb\prod\1749899778\workspace\open\src\hotspot\share\opto\phaseX.cpp:1105), pid=43216, tid=28112
# assert(!failure) failed: Missed optimization opportunity in PhaseIterGVN
#
# JRE version: Java(TM) SE Runtime Environment (26.0+3) (fastdebug build 26-ea+3-151)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (fastdebug 26-ea+3-151, mixed mode, sharing, compressed oops, compressed class ptrs, g1 gc, windows-amd64)
# Problematic frame:
# V [jvm.dll+0xe331bc] PhaseIterGVN::verify_optimize+0x65c
#
# Core dump will be written. Default location: C:\sb\prod\1749929752\testoutput\test-support\jtreg_closed_test_hotspot_jtreg_applications_javafuzzer_MediumTest_java\tmpfuzzer.tmp.A8LDlH8i12\hs_err_pid43216.mdmp
#
# If you would like to submit a bug report, please visit:
# https://bugreport.java.com/bugreport/crash.jsp
#

--------------- S U M M A R Y ------------

Command Line: -Xmx1G -XX:+IgnoreUnrecognizedVMOptions -XX:CompileCommand=quiet -XX:CompileCommand=compileonly,*Test*::* -XX:-TieredCompilation -XX:+UnlockDiagnosticVMOptions -XX:StressSeed=10542763 -Xbatch -XX:+UnlockDiagnosticVMOptions -XX:+StressLCM -XX:+StressGCM -XX:+StressIGVN -XX:+StressCCP -XX:+StressMacroExpansion -XX:+VerifyLoopOptimizations -XX:VerifyIterativeGVN=1110 -XX:MaxRAMPercentage=4.16667 -Dtest.boot.jdk=c:\ade\mesos\work_dir\jib-master\install\jdk\24\36\bundles\windows-x64\jdk-24_windows-x64_bin.zip\jdk-24 -Djava.io.tmpdir=c:\sb\prod\1749929752\testoutput\test-support\jtreg_closed_test_hotspot_jtreg_applications_javafuzzer_MediumTest_java\tmp -XX:+CreateCoredumpOnCrash Test

Host: AMD EPYC 7J13 64-Core Processor , 12 cores, 23G, Windows Server 2019 , 64 bit Build 17763 (10.0.17763.7009)
Time: Sat Jun 14 21:17:43 2025 /GM elapsed time: 1.115083 seconds (0d 0h 0m 1s)

--------------- T H R E A D ---------------

Current thread (0x00000200149731f0): JavaThread "C2 CompilerThread0" daemon [_thread_in_native, id=28112, stack(0x000000057e600000,0x000000057e700000) (1024K)]


Current CompileTask:
C2:1115 6 b Test::mainTest (544 bytes)

Stack: [0x000000057e600000,0x000000057e700000], sp=0x000000057e6fb520, free space=1005k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [jvm.dll+0xe331bc] PhaseIterGVN::verify_optimize+0x65c (phaseX.cpp:1105)
V [jvm.dll+0xe2d446] PhaseIterGVN::optimize+0x446 (phaseX.cpp:1070)
V [jvm.dll+0x5c7050] PhaseIdealLoop::optimize+0x190 (loopnode.hpp:1269)
V [jvm.dll+0x5b85a0] Compile::Optimize+0x880 (compile.cpp:2469)
V [jvm.dll+0x5b564a] Compile::Compile+0x10fa (compile.cpp:869)
V [jvm.dll+0x4b98b9] C2Compiler::compile_method+0x179 (c2compiler.cpp:144)
V [jvm.dll+0x5d3abe] CompileBroker::invoke_compiler_on_method+0x7ae (compileBroker.cpp:2323)
V [jvm.dll+0x5d0e0f] CompileBroker::compiler_thread_loop+0x32f (compileBroker.cpp:1968)
V [jvm.dll+0x924b48] JavaThread::thread_main_inner+0x288 (javaThread.cpp:774)
V [jvm.dll+0x1030002] Thread::call_run+0x1b2 (thread.cpp:248)
V [jvm.dll+0xde2d41] thread_native_entry+0xe1 (os_windows.cpp:562)
C [ucrtbase.dll+0x2268a] (no source info available)
C [KERNEL32.DLL+0x17ac4] (no source info available)
C [ntdll.dll+0x5a8c1] (no source info available)