946 lines
36 KiB
C++
946 lines
36 KiB
C++
/*
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* Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include "precompiled.hpp"
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#include "c1/c1_Canonicalizer.hpp"
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#include "c1/c1_InstructionPrinter.hpp"
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#include "c1/c1_ValueStack.hpp"
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#include "ci/ciArray.hpp"
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#include "runtime/sharedRuntime.hpp"
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class PrintValueVisitor: public ValueVisitor {
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void visit(Value* vp) {
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(*vp)->print_line();
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}
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};
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void Canonicalizer::set_canonical(Value x) {
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assert(x != NULL, "value must exist");
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// Note: we can not currently substitute root nodes which show up in
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// the instruction stream (because the instruction list is embedded
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// in the instructions).
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if (canonical() != x) {
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#ifndef PRODUCT
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if (!x->has_printable_bci()) {
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x->set_printable_bci(bci());
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}
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#endif
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if (PrintCanonicalization) {
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PrintValueVisitor do_print_value;
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canonical()->input_values_do(&do_print_value);
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canonical()->print_line();
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tty->print_cr("canonicalized to:");
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x->input_values_do(&do_print_value);
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x->print_line();
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tty->cr();
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}
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assert(_canonical->type()->tag() == x->type()->tag(), "types must match");
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_canonical = x;
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}
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}
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void Canonicalizer::move_const_to_right(Op2* x) {
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if (x->x()->type()->is_constant() && x->is_commutative()) x->swap_operands();
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}
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void Canonicalizer::do_Op2(Op2* x) {
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if (x->x() == x->y()) {
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switch (x->op()) {
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case Bytecodes::_isub: set_constant(0); return;
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case Bytecodes::_lsub: set_constant(jlong_cast(0)); return;
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case Bytecodes::_iand: // fall through
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case Bytecodes::_land: // fall through
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case Bytecodes::_ior: // fall through
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case Bytecodes::_lor : set_canonical(x->x()); return;
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case Bytecodes::_ixor: set_constant(0); return;
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case Bytecodes::_lxor: set_constant(jlong_cast(0)); return;
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}
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}
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if (x->x()->type()->is_constant() && x->y()->type()->is_constant()) {
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// do constant folding for selected operations
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switch (x->type()->tag()) {
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case intTag:
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{ jint a = x->x()->type()->as_IntConstant()->value();
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jint b = x->y()->type()->as_IntConstant()->value();
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switch (x->op()) {
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case Bytecodes::_iadd: set_constant(a + b); return;
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case Bytecodes::_isub: set_constant(a - b); return;
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case Bytecodes::_imul: set_constant(a * b); return;
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case Bytecodes::_idiv:
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if (b != 0) {
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if (a == min_jint && b == -1) {
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set_constant(min_jint);
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} else {
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set_constant(a / b);
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}
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return;
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}
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break;
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case Bytecodes::_irem:
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if (b != 0) {
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if (a == min_jint && b == -1) {
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set_constant(0);
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} else {
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set_constant(a % b);
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}
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return;
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}
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break;
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case Bytecodes::_iand: set_constant(a & b); return;
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case Bytecodes::_ior : set_constant(a | b); return;
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case Bytecodes::_ixor: set_constant(a ^ b); return;
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}
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}
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break;
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case longTag:
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{ jlong a = x->x()->type()->as_LongConstant()->value();
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jlong b = x->y()->type()->as_LongConstant()->value();
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switch (x->op()) {
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case Bytecodes::_ladd: set_constant(a + b); return;
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case Bytecodes::_lsub: set_constant(a - b); return;
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case Bytecodes::_lmul: set_constant(a * b); return;
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case Bytecodes::_ldiv:
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if (b != 0) {
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set_constant(SharedRuntime::ldiv(b, a));
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return;
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}
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break;
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case Bytecodes::_lrem:
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if (b != 0) {
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set_constant(SharedRuntime::lrem(b, a));
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return;
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}
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break;
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case Bytecodes::_land: set_constant(a & b); return;
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case Bytecodes::_lor : set_constant(a | b); return;
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case Bytecodes::_lxor: set_constant(a ^ b); return;
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}
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}
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break;
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// other cases not implemented (must be extremely careful with floats & doubles!)
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}
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}
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// make sure constant is on the right side, if any
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move_const_to_right(x);
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if (x->y()->type()->is_constant()) {
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// do constant folding for selected operations
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switch (x->type()->tag()) {
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case intTag:
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if (x->y()->type()->as_IntConstant()->value() == 0) {
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switch (x->op()) {
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case Bytecodes::_iadd: set_canonical(x->x()); return;
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case Bytecodes::_isub: set_canonical(x->x()); return;
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case Bytecodes::_imul: set_constant(0); return;
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// Note: for div and rem, make sure that C semantics
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// corresponds to Java semantics!
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case Bytecodes::_iand: set_constant(0); return;
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case Bytecodes::_ior : set_canonical(x->x()); return;
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}
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}
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break;
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case longTag:
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if (x->y()->type()->as_LongConstant()->value() == (jlong)0) {
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switch (x->op()) {
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case Bytecodes::_ladd: set_canonical(x->x()); return;
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case Bytecodes::_lsub: set_canonical(x->x()); return;
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case Bytecodes::_lmul: set_constant((jlong)0); return;
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// Note: for div and rem, make sure that C semantics
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// corresponds to Java semantics!
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case Bytecodes::_land: set_constant((jlong)0); return;
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case Bytecodes::_lor : set_canonical(x->x()); return;
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}
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}
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break;
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}
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}
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}
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void Canonicalizer::do_Phi (Phi* x) {}
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void Canonicalizer::do_Constant (Constant* x) {}
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void Canonicalizer::do_Local (Local* x) {}
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void Canonicalizer::do_LoadField (LoadField* x) {}
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// checks if v is in the block that is currently processed by
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// GraphBuilder. This is the only block that has not BlockEnd yet.
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static bool in_current_block(Value v) {
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int max_distance = 4;
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while (max_distance > 0 && v != NULL && v->as_BlockEnd() == NULL) {
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v = v->next();
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max_distance--;
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}
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return v == NULL;
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}
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void Canonicalizer::do_StoreField (StoreField* x) {
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// If a value is going to be stored into a field or array some of
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// the conversions emitted by javac are unneeded because the fields
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// are packed to their natural size.
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Convert* conv = x->value()->as_Convert();
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if (conv) {
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Value value = NULL;
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BasicType type = x->field()->type()->basic_type();
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switch (conv->op()) {
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case Bytecodes::_i2b: if (type == T_BYTE) value = conv->value(); break;
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case Bytecodes::_i2s: if (type == T_SHORT || type == T_BYTE) value = conv->value(); break;
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case Bytecodes::_i2c: if (type == T_CHAR || type == T_BYTE) value = conv->value(); break;
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}
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// limit this optimization to current block
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if (value != NULL && in_current_block(conv)) {
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set_canonical(new StoreField(x->obj(), x->offset(), x->field(), value, x->is_static(),
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x->state_before(), x->needs_patching()));
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return;
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}
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}
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}
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void Canonicalizer::do_ArrayLength (ArrayLength* x) {
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NewArray* array = x->array()->as_NewArray();
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if (array != NULL && array->length() != NULL) {
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Constant* length = array->length()->as_Constant();
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if (length != NULL) {
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// do not use the Constant itself, but create a new Constant
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// with same value Otherwise a Constant is live over multiple
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// blocks without being registered in a state array.
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assert(length->type()->as_IntConstant() != NULL, "array length must be integer");
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set_constant(length->type()->as_IntConstant()->value());
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}
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} else {
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LoadField* lf = x->array()->as_LoadField();
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if (lf != NULL) {
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ciField* field = lf->field();
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if (field->is_constant() && field->is_static()) {
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// final static field
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ciObject* c = field->constant_value().as_object();
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if (c->is_array()) {
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ciArray* array = (ciArray*) c;
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set_constant(array->length());
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}
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}
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}
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}
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}
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void Canonicalizer::do_LoadIndexed (LoadIndexed* x) {}
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void Canonicalizer::do_StoreIndexed (StoreIndexed* x) {
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// If a value is going to be stored into a field or array some of
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// the conversions emitted by javac are unneeded because the fields
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// are packed to their natural size.
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Convert* conv = x->value()->as_Convert();
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if (conv) {
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Value value = NULL;
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BasicType type = x->elt_type();
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switch (conv->op()) {
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case Bytecodes::_i2b: if (type == T_BYTE) value = conv->value(); break;
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case Bytecodes::_i2s: if (type == T_SHORT || type == T_BYTE) value = conv->value(); break;
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case Bytecodes::_i2c: if (type == T_CHAR || type == T_BYTE) value = conv->value(); break;
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}
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// limit this optimization to current block
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if (value != NULL && in_current_block(conv)) {
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set_canonical(new StoreIndexed(x->array(), x->index(), x->length(),
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x->elt_type(), value, x->state_before()));
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return;
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}
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}
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}
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void Canonicalizer::do_NegateOp(NegateOp* x) {
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ValueType* t = x->x()->type();
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if (t->is_constant()) {
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switch (t->tag()) {
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case intTag : set_constant(-t->as_IntConstant ()->value()); return;
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case longTag : set_constant(-t->as_LongConstant ()->value()); return;
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case floatTag : set_constant(-t->as_FloatConstant ()->value()); return;
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case doubleTag: set_constant(-t->as_DoubleConstant()->value()); return;
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default : ShouldNotReachHere();
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}
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}
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}
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void Canonicalizer::do_ArithmeticOp (ArithmeticOp* x) { do_Op2(x); }
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void Canonicalizer::do_ShiftOp (ShiftOp* x) {
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ValueType* t = x->x()->type();
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ValueType* t2 = x->y()->type();
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if (t->is_constant()) {
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switch (t->tag()) {
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case intTag : if (t->as_IntConstant()->value() == 0) { set_constant(0); return; } break;
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case longTag : if (t->as_LongConstant()->value() == (jlong)0) { set_constant(jlong_cast(0)); return; } break;
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default : ShouldNotReachHere();
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}
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if (t2->is_constant()) {
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if (t->tag() == intTag) {
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int value = t->as_IntConstant()->value();
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int shift = t2->as_IntConstant()->value() & 31;
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jint mask = ~(~0 << (32 - shift));
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if (shift == 0) mask = ~0;
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switch (x->op()) {
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case Bytecodes::_ishl: set_constant(value << shift); return;
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case Bytecodes::_ishr: set_constant(value >> shift); return;
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case Bytecodes::_iushr: set_constant((value >> shift) & mask); return;
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}
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} else if (t->tag() == longTag) {
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jlong value = t->as_LongConstant()->value();
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int shift = t2->as_IntConstant()->value() & 63;
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jlong mask = ~(~jlong_cast(0) << (64 - shift));
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if (shift == 0) mask = ~jlong_cast(0);
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switch (x->op()) {
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case Bytecodes::_lshl: set_constant(value << shift); return;
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case Bytecodes::_lshr: set_constant(value >> shift); return;
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case Bytecodes::_lushr: set_constant((value >> shift) & mask); return;
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}
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}
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}
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}
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if (t2->is_constant()) {
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switch (t2->tag()) {
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case intTag : if (t2->as_IntConstant()->value() == 0) set_canonical(x->x()); return;
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case longTag : if (t2->as_IntConstant()->value() == 0) set_canonical(x->x()); return;
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default : ShouldNotReachHere();
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}
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}
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}
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void Canonicalizer::do_LogicOp (LogicOp* x) { do_Op2(x); }
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void Canonicalizer::do_CompareOp (CompareOp* x) {
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if (x->x() == x->y()) {
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switch (x->x()->type()->tag()) {
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case longTag: set_constant(0); break;
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case floatTag: {
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FloatConstant* fc = x->x()->type()->as_FloatConstant();
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if (fc) {
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if (g_isnan(fc->value())) {
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set_constant(x->op() == Bytecodes::_fcmpl ? -1 : 1);
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} else {
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set_constant(0);
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}
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}
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break;
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}
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case doubleTag: {
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DoubleConstant* dc = x->x()->type()->as_DoubleConstant();
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if (dc) {
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if (g_isnan(dc->value())) {
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set_constant(x->op() == Bytecodes::_dcmpl ? -1 : 1);
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} else {
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set_constant(0);
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}
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}
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break;
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}
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}
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} else if (x->x()->type()->is_constant() && x->y()->type()->is_constant()) {
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switch (x->x()->type()->tag()) {
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case longTag: {
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jlong vx = x->x()->type()->as_LongConstant()->value();
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jlong vy = x->y()->type()->as_LongConstant()->value();
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if (vx == vy)
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set_constant(0);
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else if (vx < vy)
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set_constant(-1);
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else
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set_constant(1);
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break;
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}
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case floatTag: {
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float vx = x->x()->type()->as_FloatConstant()->value();
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float vy = x->y()->type()->as_FloatConstant()->value();
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if (g_isnan(vx) || g_isnan(vy))
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set_constant(x->op() == Bytecodes::_fcmpl ? -1 : 1);
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else if (vx == vy)
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set_constant(0);
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else if (vx < vy)
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set_constant(-1);
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else
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set_constant(1);
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break;
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}
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case doubleTag: {
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double vx = x->x()->type()->as_DoubleConstant()->value();
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double vy = x->y()->type()->as_DoubleConstant()->value();
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if (g_isnan(vx) || g_isnan(vy))
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set_constant(x->op() == Bytecodes::_dcmpl ? -1 : 1);
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else if (vx == vy)
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set_constant(0);
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else if (vx < vy)
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set_constant(-1);
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else
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set_constant(1);
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break;
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}
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}
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}
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}
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void Canonicalizer::do_IfInstanceOf(IfInstanceOf* x) {}
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void Canonicalizer::do_IfOp(IfOp* x) {
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// Caution: do not use do_Op2(x) here for now since
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// we map the condition to the op for now!
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move_const_to_right(x);
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}
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void Canonicalizer::do_Intrinsic (Intrinsic* x) {
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switch (x->id()) {
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case vmIntrinsics::_floatToRawIntBits : {
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FloatConstant* c = x->argument_at(0)->type()->as_FloatConstant();
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if (c != NULL) {
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JavaValue v;
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v.set_jfloat(c->value());
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set_constant(v.get_jint());
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}
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break;
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}
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case vmIntrinsics::_intBitsToFloat : {
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IntConstant* c = x->argument_at(0)->type()->as_IntConstant();
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if (c != NULL) {
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JavaValue v;
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v.set_jint(c->value());
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set_constant(v.get_jfloat());
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}
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break;
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}
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case vmIntrinsics::_doubleToRawLongBits : {
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DoubleConstant* c = x->argument_at(0)->type()->as_DoubleConstant();
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if (c != NULL) {
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JavaValue v;
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v.set_jdouble(c->value());
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set_constant(v.get_jlong());
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}
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break;
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}
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case vmIntrinsics::_longBitsToDouble : {
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LongConstant* c = x->argument_at(0)->type()->as_LongConstant();
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if (c != NULL) {
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JavaValue v;
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v.set_jlong(c->value());
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set_constant(v.get_jdouble());
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}
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break;
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}
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case vmIntrinsics::_isInstance : {
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assert(x->number_of_arguments() == 2, "wrong type");
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InstanceConstant* c = x->argument_at(0)->type()->as_InstanceConstant();
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if (c != NULL && !c->value()->is_null_object()) {
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|
// ciInstance::java_mirror_type() returns non-NULL only for Java mirrors
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ciType* t = c->value()->as_instance()->java_mirror_type();
|
|
if (t->is_klass()) {
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|
// substitute cls.isInstance(obj) of a constant Class into
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// an InstantOf instruction
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InstanceOf* i = new InstanceOf(t->as_klass(), x->argument_at(1), x->state_before());
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set_canonical(i);
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// and try to canonicalize even further
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do_InstanceOf(i);
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} else {
|
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assert(t->is_primitive_type(), "should be a primitive type");
|
|
// cls.isInstance(obj) always returns false for primitive classes
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|
set_constant(0);
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|
}
|
|
}
|
|
break;
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|
}
|
|
}
|
|
}
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|
|
void Canonicalizer::do_Convert (Convert* x) {
|
|
if (x->value()->type()->is_constant()) {
|
|
switch (x->op()) {
|
|
case Bytecodes::_i2b: set_constant((int)((x->value()->type()->as_IntConstant()->value() << 24) >> 24)); break;
|
|
case Bytecodes::_i2s: set_constant((int)((x->value()->type()->as_IntConstant()->value() << 16) >> 16)); break;
|
|
case Bytecodes::_i2c: set_constant((int)(x->value()->type()->as_IntConstant()->value() & ((1<<16)-1))); break;
|
|
case Bytecodes::_i2l: set_constant((jlong)(x->value()->type()->as_IntConstant()->value())); break;
|
|
case Bytecodes::_i2f: set_constant((float)(x->value()->type()->as_IntConstant()->value())); break;
|
|
case Bytecodes::_i2d: set_constant((double)(x->value()->type()->as_IntConstant()->value())); break;
|
|
case Bytecodes::_l2i: set_constant((int)(x->value()->type()->as_LongConstant()->value())); break;
|
|
case Bytecodes::_l2f: set_constant(SharedRuntime::l2f(x->value()->type()->as_LongConstant()->value())); break;
|
|
case Bytecodes::_l2d: set_constant(SharedRuntime::l2d(x->value()->type()->as_LongConstant()->value())); break;
|
|
case Bytecodes::_f2d: set_constant((double)(x->value()->type()->as_FloatConstant()->value())); break;
|
|
case Bytecodes::_f2i: set_constant(SharedRuntime::f2i(x->value()->type()->as_FloatConstant()->value())); break;
|
|
case Bytecodes::_f2l: set_constant(SharedRuntime::f2l(x->value()->type()->as_FloatConstant()->value())); break;
|
|
case Bytecodes::_d2f: set_constant((float)(x->value()->type()->as_DoubleConstant()->value())); break;
|
|
case Bytecodes::_d2i: set_constant(SharedRuntime::d2i(x->value()->type()->as_DoubleConstant()->value())); break;
|
|
case Bytecodes::_d2l: set_constant(SharedRuntime::d2l(x->value()->type()->as_DoubleConstant()->value())); break;
|
|
default:
|
|
ShouldNotReachHere();
|
|
}
|
|
}
|
|
|
|
Value value = x->value();
|
|
BasicType type = T_ILLEGAL;
|
|
LoadField* lf = value->as_LoadField();
|
|
if (lf) {
|
|
type = lf->field_type();
|
|
} else {
|
|
LoadIndexed* li = value->as_LoadIndexed();
|
|
if (li) {
|
|
type = li->elt_type();
|
|
} else {
|
|
Convert* conv = value->as_Convert();
|
|
if (conv) {
|
|
switch (conv->op()) {
|
|
case Bytecodes::_i2b: type = T_BYTE; break;
|
|
case Bytecodes::_i2s: type = T_SHORT; break;
|
|
case Bytecodes::_i2c: type = T_CHAR; break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if (type != T_ILLEGAL) {
|
|
switch (x->op()) {
|
|
case Bytecodes::_i2b: if (type == T_BYTE) set_canonical(x->value()); break;
|
|
case Bytecodes::_i2s: if (type == T_SHORT || type == T_BYTE) set_canonical(x->value()); break;
|
|
case Bytecodes::_i2c: if (type == T_CHAR) set_canonical(x->value()); break;
|
|
}
|
|
} else {
|
|
Op2* op2 = x->value()->as_Op2();
|
|
if (op2 && op2->op() == Bytecodes::_iand && op2->y()->type()->is_constant()) {
|
|
jint safebits = 0;
|
|
jint mask = op2->y()->type()->as_IntConstant()->value();
|
|
switch (x->op()) {
|
|
case Bytecodes::_i2b: safebits = 0x7f; break;
|
|
case Bytecodes::_i2s: safebits = 0x7fff; break;
|
|
case Bytecodes::_i2c: safebits = 0xffff; break;
|
|
}
|
|
// When casting a masked integer to a smaller signed type, if
|
|
// the mask doesn't include the sign bit the cast isn't needed.
|
|
if (safebits && (mask & ~safebits) == 0) {
|
|
set_canonical(x->value());
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
void Canonicalizer::do_NullCheck (NullCheck* x) {
|
|
if (x->obj()->as_NewArray() != NULL || x->obj()->as_NewInstance() != NULL) {
|
|
set_canonical(x->obj());
|
|
} else {
|
|
Constant* con = x->obj()->as_Constant();
|
|
if (con) {
|
|
ObjectType* c = con->type()->as_ObjectType();
|
|
if (c && c->is_loaded()) {
|
|
ObjectConstant* oc = c->as_ObjectConstant();
|
|
if (!oc || !oc->value()->is_null_object()) {
|
|
set_canonical(con);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void Canonicalizer::do_TypeCast (TypeCast* x) {}
|
|
void Canonicalizer::do_Invoke (Invoke* x) {}
|
|
void Canonicalizer::do_NewInstance (NewInstance* x) {}
|
|
void Canonicalizer::do_NewTypeArray (NewTypeArray* x) {}
|
|
void Canonicalizer::do_NewObjectArray (NewObjectArray* x) {}
|
|
void Canonicalizer::do_NewMultiArray (NewMultiArray* x) {}
|
|
void Canonicalizer::do_CheckCast (CheckCast* x) {
|
|
if (x->klass()->is_loaded()) {
|
|
Value obj = x->obj();
|
|
ciType* klass = obj->exact_type();
|
|
if (klass == NULL) klass = obj->declared_type();
|
|
if (klass != NULL && klass->is_loaded() && klass->is_subtype_of(x->klass())) {
|
|
set_canonical(obj);
|
|
return;
|
|
}
|
|
// checkcast of null returns null
|
|
if (obj->as_Constant() && obj->type()->as_ObjectType()->constant_value()->is_null_object()) {
|
|
set_canonical(obj);
|
|
}
|
|
}
|
|
}
|
|
void Canonicalizer::do_InstanceOf (InstanceOf* x) {
|
|
if (x->klass()->is_loaded()) {
|
|
Value obj = x->obj();
|
|
ciType* exact = obj->exact_type();
|
|
if (exact != NULL && exact->is_loaded() && (obj->as_NewInstance() || obj->as_NewArray())) {
|
|
set_constant(exact->is_subtype_of(x->klass()) ? 1 : 0);
|
|
return;
|
|
}
|
|
// instanceof null returns false
|
|
if (obj->as_Constant() && obj->type()->as_ObjectType()->constant_value()->is_null_object()) {
|
|
set_constant(0);
|
|
}
|
|
}
|
|
|
|
}
|
|
void Canonicalizer::do_MonitorEnter (MonitorEnter* x) {}
|
|
void Canonicalizer::do_MonitorExit (MonitorExit* x) {}
|
|
void Canonicalizer::do_BlockBegin (BlockBegin* x) {}
|
|
void Canonicalizer::do_Goto (Goto* x) {}
|
|
|
|
|
|
static bool is_true(jlong x, If::Condition cond, jlong y) {
|
|
switch (cond) {
|
|
case If::eql: return x == y;
|
|
case If::neq: return x != y;
|
|
case If::lss: return x < y;
|
|
case If::leq: return x <= y;
|
|
case If::gtr: return x > y;
|
|
case If::geq: return x >= y;
|
|
}
|
|
ShouldNotReachHere();
|
|
return false;
|
|
}
|
|
|
|
static bool is_safepoint(BlockEnd* x, BlockBegin* sux) {
|
|
// An Instruction with multiple successors, x, is replaced by a Goto
|
|
// to a single successor, sux. Is a safepoint check needed = was the
|
|
// instruction being replaced a safepoint and the single remaining
|
|
// successor a back branch?
|
|
return x->is_safepoint() && (sux->bci() < x->state_before()->bci());
|
|
}
|
|
|
|
void Canonicalizer::do_If(If* x) {
|
|
// move const to right
|
|
if (x->x()->type()->is_constant()) x->swap_operands();
|
|
// simplify
|
|
const Value l = x->x(); ValueType* lt = l->type();
|
|
const Value r = x->y(); ValueType* rt = r->type();
|
|
|
|
if (l == r && !lt->is_float_kind()) {
|
|
// pattern: If (a cond a) => simplify to Goto
|
|
BlockBegin* sux;
|
|
switch (x->cond()) {
|
|
case If::eql: sux = x->sux_for(true); break;
|
|
case If::neq: sux = x->sux_for(false); break;
|
|
case If::lss: sux = x->sux_for(false); break;
|
|
case If::leq: sux = x->sux_for(true); break;
|
|
case If::gtr: sux = x->sux_for(false); break;
|
|
case If::geq: sux = x->sux_for(true); break;
|
|
}
|
|
// If is a safepoint then the debug information should come from the state_before of the If.
|
|
set_canonical(new Goto(sux, x->state_before(), is_safepoint(x, sux)));
|
|
return;
|
|
}
|
|
|
|
if (lt->is_constant() && rt->is_constant()) {
|
|
if (x->x()->as_Constant() != NULL) {
|
|
// pattern: If (lc cond rc) => simplify to: Goto
|
|
BlockBegin* sux = x->x()->as_Constant()->compare(x->cond(), x->y(),
|
|
x->sux_for(true),
|
|
x->sux_for(false));
|
|
if (sux != NULL) {
|
|
// If is a safepoint then the debug information should come from the state_before of the If.
|
|
set_canonical(new Goto(sux, x->state_before(), is_safepoint(x, sux)));
|
|
}
|
|
}
|
|
} else if (rt->as_IntConstant() != NULL) {
|
|
// pattern: If (l cond rc) => investigate further
|
|
const jint rc = rt->as_IntConstant()->value();
|
|
if (l->as_CompareOp() != NULL) {
|
|
// pattern: If ((a cmp b) cond rc) => simplify to: If (x cond y) or: Goto
|
|
CompareOp* cmp = l->as_CompareOp();
|
|
bool unordered_is_less = cmp->op() == Bytecodes::_fcmpl || cmp->op() == Bytecodes::_dcmpl;
|
|
BlockBegin* lss_sux = x->sux_for(is_true(-1, x->cond(), rc)); // successor for a < b
|
|
BlockBegin* eql_sux = x->sux_for(is_true( 0, x->cond(), rc)); // successor for a = b
|
|
BlockBegin* gtr_sux = x->sux_for(is_true(+1, x->cond(), rc)); // successor for a > b
|
|
BlockBegin* nan_sux = unordered_is_less ? lss_sux : gtr_sux ; // successor for unordered
|
|
// Note: At this point all successors (lss_sux, eql_sux, gtr_sux, nan_sux) are
|
|
// equal to x->tsux() or x->fsux(). Furthermore, nan_sux equals either
|
|
// lss_sux or gtr_sux.
|
|
if (lss_sux == eql_sux && eql_sux == gtr_sux) {
|
|
// all successors identical => simplify to: Goto
|
|
set_canonical(new Goto(lss_sux, x->state_before(), x->is_safepoint()));
|
|
} else {
|
|
// two successors differ and two successors are the same => simplify to: If (x cmp y)
|
|
// determine new condition & successors
|
|
If::Condition cond;
|
|
BlockBegin* tsux = NULL;
|
|
BlockBegin* fsux = NULL;
|
|
if (lss_sux == eql_sux) { cond = If::leq; tsux = lss_sux; fsux = gtr_sux; }
|
|
else if (lss_sux == gtr_sux) { cond = If::neq; tsux = lss_sux; fsux = eql_sux; }
|
|
else if (eql_sux == gtr_sux) { cond = If::geq; tsux = eql_sux; fsux = lss_sux; }
|
|
else { ShouldNotReachHere(); }
|
|
If* canon = new If(cmp->x(), cond, nan_sux == tsux, cmp->y(), tsux, fsux, cmp->state_before(), x->is_safepoint());
|
|
if (cmp->x() == cmp->y()) {
|
|
do_If(canon);
|
|
} else {
|
|
if (compilation()->profile_branches()) {
|
|
// TODO: If profiling, leave floating point comparisons unoptimized.
|
|
// We currently do not support profiling of the unordered case.
|
|
switch(cmp->op()) {
|
|
case Bytecodes::_fcmpl: case Bytecodes::_fcmpg:
|
|
case Bytecodes::_dcmpl: case Bytecodes::_dcmpg:
|
|
set_canonical(x);
|
|
return;
|
|
}
|
|
}
|
|
set_bci(cmp->state_before()->bci());
|
|
set_canonical(canon);
|
|
}
|
|
}
|
|
} else if (l->as_InstanceOf() != NULL) {
|
|
// NOTE: Code permanently disabled for now since it leaves the old InstanceOf
|
|
// instruction in the graph (it is pinned). Need to fix this at some point.
|
|
// It should also be left in the graph when generating a profiled method version or Goto
|
|
// has to know that it was an InstanceOf.
|
|
return;
|
|
// pattern: If ((obj instanceof klass) cond rc) => simplify to: IfInstanceOf or: Goto
|
|
InstanceOf* inst = l->as_InstanceOf();
|
|
BlockBegin* is_inst_sux = x->sux_for(is_true(1, x->cond(), rc)); // successor for instanceof == 1
|
|
BlockBegin* no_inst_sux = x->sux_for(is_true(0, x->cond(), rc)); // successor for instanceof == 0
|
|
if (is_inst_sux == no_inst_sux && inst->is_loaded()) {
|
|
// both successors identical and klass is loaded => simplify to: Goto
|
|
set_canonical(new Goto(is_inst_sux, x->state_before(), x->is_safepoint()));
|
|
} else {
|
|
// successors differ => simplify to: IfInstanceOf
|
|
set_canonical(new IfInstanceOf(inst->klass(), inst->obj(), true, inst->state_before()->bci(), is_inst_sux, no_inst_sux));
|
|
}
|
|
}
|
|
} else if (rt == objectNull && (l->as_NewInstance() || l->as_NewArray())) {
|
|
if (x->cond() == Instruction::eql) {
|
|
BlockBegin* sux = x->fsux();
|
|
set_canonical(new Goto(sux, x->state_before(), is_safepoint(x, sux)));
|
|
} else {
|
|
assert(x->cond() == Instruction::neq, "only other valid case");
|
|
BlockBegin* sux = x->tsux();
|
|
set_canonical(new Goto(sux, x->state_before(), is_safepoint(x, sux)));
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
void Canonicalizer::do_TableSwitch(TableSwitch* x) {
|
|
if (x->tag()->type()->is_constant()) {
|
|
int v = x->tag()->type()->as_IntConstant()->value();
|
|
BlockBegin* sux = x->default_sux();
|
|
if (v >= x->lo_key() && v <= x->hi_key()) {
|
|
sux = x->sux_at(v - x->lo_key());
|
|
}
|
|
set_canonical(new Goto(sux, x->state_before(), is_safepoint(x, sux)));
|
|
} else if (x->number_of_sux() == 1) {
|
|
// NOTE: Code permanently disabled for now since the switch statement's
|
|
// tag expression may produce side-effects in which case it must
|
|
// be executed.
|
|
return;
|
|
// simplify to Goto
|
|
set_canonical(new Goto(x->default_sux(), x->state_before(), x->is_safepoint()));
|
|
} else if (x->number_of_sux() == 2) {
|
|
// NOTE: Code permanently disabled for now since it produces two new nodes
|
|
// (Constant & If) and the Canonicalizer cannot return them correctly
|
|
// yet. For now we copied the corresponding code directly into the
|
|
// GraphBuilder (i.e., we should never reach here).
|
|
return;
|
|
// simplify to If
|
|
assert(x->lo_key() == x->hi_key(), "keys must be the same");
|
|
Constant* key = new Constant(new IntConstant(x->lo_key()));
|
|
set_canonical(new If(x->tag(), If::eql, true, key, x->sux_at(0), x->default_sux(), x->state_before(), x->is_safepoint()));
|
|
}
|
|
}
|
|
|
|
|
|
void Canonicalizer::do_LookupSwitch(LookupSwitch* x) {
|
|
if (x->tag()->type()->is_constant()) {
|
|
int v = x->tag()->type()->as_IntConstant()->value();
|
|
BlockBegin* sux = x->default_sux();
|
|
for (int i = 0; i < x->length(); i++) {
|
|
if (v == x->key_at(i)) {
|
|
sux = x->sux_at(i);
|
|
}
|
|
}
|
|
set_canonical(new Goto(sux, x->state_before(), is_safepoint(x, sux)));
|
|
} else if (x->number_of_sux() == 1) {
|
|
// NOTE: Code permanently disabled for now since the switch statement's
|
|
// tag expression may produce side-effects in which case it must
|
|
// be executed.
|
|
return;
|
|
// simplify to Goto
|
|
set_canonical(new Goto(x->default_sux(), x->state_before(), x->is_safepoint()));
|
|
} else if (x->number_of_sux() == 2) {
|
|
// NOTE: Code permanently disabled for now since it produces two new nodes
|
|
// (Constant & If) and the Canonicalizer cannot return them correctly
|
|
// yet. For now we copied the corresponding code directly into the
|
|
// GraphBuilder (i.e., we should never reach here).
|
|
return;
|
|
// simplify to If
|
|
assert(x->length() == 1, "length must be the same");
|
|
Constant* key = new Constant(new IntConstant(x->key_at(0)));
|
|
set_canonical(new If(x->tag(), If::eql, true, key, x->sux_at(0), x->default_sux(), x->state_before(), x->is_safepoint()));
|
|
}
|
|
}
|
|
|
|
|
|
void Canonicalizer::do_Return (Return* x) {}
|
|
void Canonicalizer::do_Throw (Throw* x) {}
|
|
void Canonicalizer::do_Base (Base* x) {}
|
|
void Canonicalizer::do_OsrEntry (OsrEntry* x) {}
|
|
void Canonicalizer::do_ExceptionObject(ExceptionObject* x) {}
|
|
|
|
static bool match_index_and_scale(Instruction* instr,
|
|
Instruction** index,
|
|
int* log2_scale,
|
|
Instruction** instr_to_unpin) {
|
|
*instr_to_unpin = NULL;
|
|
|
|
// Skip conversion ops
|
|
Convert* convert = instr->as_Convert();
|
|
if (convert != NULL) {
|
|
instr = convert->value();
|
|
}
|
|
|
|
ShiftOp* shift = instr->as_ShiftOp();
|
|
if (shift != NULL) {
|
|
if (shift->is_pinned()) {
|
|
*instr_to_unpin = shift;
|
|
}
|
|
// Constant shift value?
|
|
Constant* con = shift->y()->as_Constant();
|
|
if (con == NULL) return false;
|
|
// Well-known type and value?
|
|
IntConstant* val = con->type()->as_IntConstant();
|
|
if (val == NULL) return false;
|
|
if (shift->x()->type() != intType) return false;
|
|
*index = shift->x();
|
|
int tmp_scale = val->value();
|
|
if (tmp_scale >= 0 && tmp_scale < 4) {
|
|
*log2_scale = tmp_scale;
|
|
return true;
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
ArithmeticOp* arith = instr->as_ArithmeticOp();
|
|
if (arith != NULL) {
|
|
if (arith->is_pinned()) {
|
|
*instr_to_unpin = arith;
|
|
}
|
|
// Check for integer multiply
|
|
if (arith->op() == Bytecodes::_imul) {
|
|
// See if either arg is a known constant
|
|
Constant* con = arith->x()->as_Constant();
|
|
if (con != NULL) {
|
|
*index = arith->y();
|
|
} else {
|
|
con = arith->y()->as_Constant();
|
|
if (con == NULL) return false;
|
|
*index = arith->x();
|
|
}
|
|
if ((*index)->type() != intType) return false;
|
|
// Well-known type and value?
|
|
IntConstant* val = con->type()->as_IntConstant();
|
|
if (val == NULL) return false;
|
|
switch (val->value()) {
|
|
case 1: *log2_scale = 0; return true;
|
|
case 2: *log2_scale = 1; return true;
|
|
case 4: *log2_scale = 2; return true;
|
|
case 8: *log2_scale = 3; return true;
|
|
default: return false;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Unknown instruction sequence; don't touch it
|
|
return false;
|
|
}
|
|
|
|
|
|
static bool match(UnsafeRawOp* x,
|
|
Instruction** base,
|
|
Instruction** index,
|
|
int* log2_scale) {
|
|
Instruction* instr_to_unpin = NULL;
|
|
ArithmeticOp* root = x->base()->as_ArithmeticOp();
|
|
if (root == NULL) return false;
|
|
// Limit ourselves to addition for now
|
|
if (root->op() != Bytecodes::_ladd) return false;
|
|
// Try to find shift or scale op
|
|
if (match_index_and_scale(root->y(), index, log2_scale, &instr_to_unpin)) {
|
|
*base = root->x();
|
|
} else if (match_index_and_scale(root->x(), index, log2_scale, &instr_to_unpin)) {
|
|
*base = root->y();
|
|
} else if (root->y()->as_Convert() != NULL) {
|
|
Convert* convert = root->y()->as_Convert();
|
|
if (convert->op() == Bytecodes::_i2l && convert->value()->type() == intType) {
|
|
// pick base and index, setting scale at 1
|
|
*base = root->x();
|
|
*index = convert->value();
|
|
*log2_scale = 0;
|
|
} else {
|
|
return false;
|
|
}
|
|
} else {
|
|
// doesn't match any expected sequences
|
|
return false;
|
|
}
|
|
|
|
// If the value is pinned then it will be always be computed so
|
|
// there's no profit to reshaping the expression.
|
|
return !root->is_pinned();
|
|
}
|
|
|
|
|
|
void Canonicalizer::do_UnsafeRawOp(UnsafeRawOp* x) {
|
|
Instruction* base = NULL;
|
|
Instruction* index = NULL;
|
|
int log2_scale;
|
|
|
|
if (match(x, &base, &index, &log2_scale)) {
|
|
x->set_base(base);
|
|
x->set_index(index);
|
|
x->set_log2_scale(log2_scale);
|
|
if (PrintUnsafeOptimization) {
|
|
tty->print_cr("Canonicalizer: UnsafeRawOp id %d: base = id %d, index = id %d, log2_scale = %d",
|
|
x->id(), x->base()->id(), x->index()->id(), x->log2_scale());
|
|
}
|
|
}
|
|
}
|
|
|
|
void Canonicalizer::do_RoundFP(RoundFP* x) {}
|
|
void Canonicalizer::do_UnsafeGetRaw(UnsafeGetRaw* x) { if (OptimizeUnsafes) do_UnsafeRawOp(x); }
|
|
void Canonicalizer::do_UnsafePutRaw(UnsafePutRaw* x) { if (OptimizeUnsafes) do_UnsafeRawOp(x); }
|
|
void Canonicalizer::do_UnsafeGetObject(UnsafeGetObject* x) {}
|
|
void Canonicalizer::do_UnsafePutObject(UnsafePutObject* x) {}
|
|
void Canonicalizer::do_UnsafeGetAndSetObject(UnsafeGetAndSetObject* x) {}
|
|
void Canonicalizer::do_UnsafePrefetchRead (UnsafePrefetchRead* x) {}
|
|
void Canonicalizer::do_UnsafePrefetchWrite(UnsafePrefetchWrite* x) {}
|
|
void Canonicalizer::do_ProfileCall(ProfileCall* x) {}
|
|
void Canonicalizer::do_ProfileReturnType(ProfileReturnType* x) {}
|
|
void Canonicalizer::do_ProfileInvoke(ProfileInvoke* x) {}
|
|
void Canonicalizer::do_RuntimeCall(RuntimeCall* x) {}
|
|
void Canonicalizer::do_RangeCheckPredicate(RangeCheckPredicate* x) {}
|
|
#ifdef ASSERT
|
|
void Canonicalizer::do_Assert(Assert* x) {}
|
|
#endif
|
|
void Canonicalizer::do_MemBar(MemBar* x) {}
|