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8322649: Improve class initialization barrier in TemplateTable::_new for S390

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Reviewed-by: mdoerr, lucy
This commit is contained in:
Amit Kumar 2024-01-31 04:41:50 +00:00
parent 7d1a48807a
commit 83b3c9b3ee
1 changed files with 6 additions and 11 deletions

17
src/hotspot/cpu/s390/templateTable_s390.cpp

@ -1,6 +1,6 @@
/*
* Copyright (c) 2016, 2024, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2016, 2023 SAP SE. All rights reserved.
* Copyright (c) 2016, 2024 SAP SE. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -3914,20 +3914,15 @@ void TemplateTable::_new() {
__ z_cli(0, tmp, JVM_CONSTANT_Class);
__ z_brne(slow_case);
__ z_sllg(offset, offset, LogBytesPerWord); // Convert to to offset.
__ z_sllg(offset, offset, LogBytesPerWord); // Convert to offset.
// Get InstanceKlass.
Register iklass = cpool;
__ load_resolved_klass_at_offset(cpool, offset, iklass);
// Make sure klass is initialized & doesn't have finalizer.
// Make sure klass is fully initialized.
const int state_offset = in_bytes(InstanceKlass::init_state_offset());
if (Immediate::is_uimm12(state_offset)) {
__ z_cli(state_offset, iklass, InstanceKlass::fully_initialized);
} else {
__ z_cliy(state_offset, iklass, InstanceKlass::fully_initialized);
}
__ z_brne(slow_case);
// make sure klass is initialized
assert(VM_Version::supports_fast_class_init_checks(),
"Optimization requires support for fast class initialization checks");
__ clinit_barrier(iklass, Z_thread, nullptr /*L_fast_path*/, &slow_case);
// Get instance_size in InstanceKlass (scaled to a count of bytes).
Register Rsize = offset;