1 /*
2 * Copyright (c) 2016, 2021, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "asm/macroAssembler.hpp"
27 #include "runtime/interfaceSupport.inline.hpp"
28 #include "runtime/sharedRuntime.hpp"
29 #include "utilities/globalDefinitions.hpp"
30 #include "vmreg_x86.inline.hpp"
31 #ifdef COMPILER1
32 #include "c1/c1_Runtime1.hpp"
33 #endif //COMPILER1
34
35 #define __ masm->
36
37 #ifdef COMPILER1
38 // ---------------------------------------------------------------------------
39 // Object.hashCode, System.identityHashCode can pull the hashCode from the
40 // header word instead of doing a full VM transition once it's been computed.
41 // Since hashCode is usually polymorphic at call sites we can't do this
42 // optimization at the call site without a lot of work.
43 void SharedRuntime::inline_check_hashcode_from_object_header(MacroAssembler* masm,
44 const methodHandle& method,
45 Register obj_reg,
46 Register result) {
47 Label slowCase;
48
49 // Unlike for Object.hashCode, System.identityHashCode is static method and
50 // gets object as argument instead of the receiver.
51 if (method->intrinsic_id() == vmIntrinsics::_identityHashCode) {
52 Label Continue;
53 // return 0 for null reference input
54 __ cmpptr(obj_reg, NULL_WORD);
55 __ jcc(Assembler::notEqual, Continue);
56 __ xorptr(result, result);
57 __ ret(0);
58 __ bind(Continue);
59 }
60
61 __ movptr(result, Address(obj_reg, oopDesc::mark_offset_in_bytes()));
62
63
64 if (LockingMode == LM_LIGHTWEIGHT) {
65 // check if monitor
66 __ testptr(result, markWord::monitor_value);
67 __ jcc(Assembler::notZero, slowCase);
68 } else {
69 // check if locked
70 __ testptr(result, markWord::unlocked_value);
71 __ jcc(Assembler::zero, slowCase);
72 }
73
74 // get hash
75 #ifdef _LP64
76 // Read the header and build a mask to get its hash field.
77 // Depend on hash_mask being at most 32 bits and avoid the use of hash_mask_in_place
78 // because it could be larger than 32 bits in a 64-bit vm. See markWord.hpp.
79 __ shrptr(result, markWord::hash_shift);
80 __ andptr(result, markWord::hash_mask);
81 #else
82 __ andptr(result, markWord::hash_mask_in_place);
83 #endif //_LP64
84
85 // test if hashCode exists
86 __ jcc(Assembler::zero, slowCase);
87 #ifndef _LP64
88 __ shrptr(result, markWord::hash_shift);
89 #endif
90 __ ret(0);
91 __ bind(slowCase);
92 }
93 #endif //COMPILER1
94
95 #if defined(TARGET_COMPILER_gcc) && !defined(_WIN64)
96 JRT_LEAF(jfloat, SharedRuntime::frem(jfloat x, jfloat y))
97 jfloat retval;
98 asm ("\
99 1: \n\
100 fprem \n\
101 fnstsw %%ax \n\
102 test $0x4,%%ah \n\
103 jne 1b \n\
104 "
105 :"=t"(retval)
106 :"0"(x), "u"(y)
107 :"cc", "ax");
108 return retval;
109 JRT_END
110
111 JRT_LEAF(jdouble, SharedRuntime::drem(jdouble x, jdouble y))
112 jdouble retval;
113 asm ("\
114 1: \n\
115 fprem \n\
116 fnstsw %%ax \n\
117 test $0x4,%%ah \n\
118 jne 1b \n\
119 "
120 :"=t"(retval)
121 :"0"(x), "u"(y)
122 :"cc", "ax");
123 return retval;
124 JRT_END
125 #endif // TARGET_COMPILER_gcc && !_WIN64