When turning on the -XX:+PinAllInstructions, C1 hits the following assertion:

#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/home/qingfeng.yy/valhalla/src/hotspot/share/c1/c1_LIRGenerator.cpp:1524), pid=81974, tid=81994
# assert(!x->is_pinned()) failed: only for unpinned constants
...
Stack: [0x00007fc0771fa000,0x00007fc0772fb000], sp=0x00007fc0772f89f0, free space=1018k
Native frames: (J=compiled Java code, A=aot compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0x65de6c] LIRGenerator::load_constant(Constant*)+0x2a
V [libjvm.so+0x65ee4b] LIRGenerator::access_sub_element(LIRItem&, LIRItem&, LIR_OprDesc*&, ciField*, int)+0x319
V [libjvm.so+0x66209c] LIRGenerator::do_LoadIndexed(LoadIndexed*)+0x846
V [libjvm.so+0x6277c4] LoadIndexed::visit(InstructionVisitor*)+0x2e
V [libjvm.so+0x6586ae] LIRGenerator::do_root(Instruction*)+0xfc
V [libjvm.so+0x65856e] LIRGenerator::block_do(BlockBegin*)+0x7c
V [libjvm.so+0x62696d] BlockList::iterate_forward(BlockClosure*)+0x5d
V [libjvm.so+0x61ee24] IR::iterate_linear_scan_order(BlockClosure*)+0x2e
V [libjvm.so+0x5ee90b] Compilation::emit_lir()+0x95
V [libjvm.so+0x5ef140] Compilation::compile_java_method()+0x21e
V [libjvm.so+0x5ef4af] Compilation::compile_method()+0x107
V [libjvm.so+0x5efd05] Compilation::Compilation(AbstractCompiler*, ciEnv*, ciMethod*, int, BufferBlob*, bool, DirectiveSet*)+0x3bb
V [libjvm.so+0x5f3baf] Compiler::compile_method(ciEnv*, ciMethod*, int, bool, DirectiveSet*)+0xd9
V [libjvm.so+0x81a938] CompileBroker::invoke_compiler_on_method(CompileTask*)+0x88a
V [libjvm.so+0x81956b] CompileBroker::compiler_thread_loop()+0x3df
V [libjvm.so+0x83bef1] CompilerThread::thread_entry(JavaThread*, Thread*)+0x69
V [libjvm.so+0x12fd598] JavaThread::thread_main_inner()+0x14c
V [libjvm.so+0x12fd444] JavaThread::run()+0x11e
V [libjvm.so+0x12fa630] Thread::call_run()+0x180
V [libjvm.so+0x1028936] thread_native_entry(Thread*)+0x1e4