1/*
2 * Copyright (C) 2015-2017 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#pragma once
27
28#if ENABLE(B3_JIT)
29
30#include "AirOpcode.h"
31
32namespace JSC::B3::Air {
33
34inline Air::Opcode moveForType(Type type)
35{
36 switch (type.kind()) {
37 case Int32:
38 return Move32;
39 case Int64:
40 RELEASE_ASSERT(is64Bit());
41 return Move;
42 case Float:
43 return MoveFloat;
44 case Double:
45 return MoveDouble;
46 case Void:
47 case Tuple:
48 break;
49 }
50 RELEASE_ASSERT_NOT_REACHED();
51 return Air::Oops;
52}
53
54inline Air::Opcode relaxedMoveForType(Type type)
55{
56 switch (type.kind()) {
57 case Int32:
58 case Int64:
59 // For Int32, we could return Move or Move32. It's a trade-off.
60 //
61 // Move32: Using Move32 guarantees that we use the narrower move, but in cases where the
62 // register allocator can't prove that the variables involved are 32-bit, this will
63 // disable coalescing.
64 //
65 // Move: Using Move guarantees that the register allocator can coalesce normally, but in
66 // cases where it can't prove that the variables are 32-bit and it doesn't coalesce,
67 // this will force us to use a full 64-bit Move instead of the slightly cheaper
68 // 32-bit Move32.
69 //
70 // Coalescing is a lot more profitable than turning Move into Move32. So, it's better to
71 // use Move here because in cases where the register allocator cannot prove that
72 // everything is 32-bit, we still get coalescing.
73 return Move;
74 case Float:
75 // MoveFloat is always coalescable and we never convert MoveDouble to MoveFloat, so we
76 // should use MoveFloat when we know that the temporaries involved are 32-bit.
77 return MoveFloat;
78 case Double:
79 return MoveDouble;
80 case Void:
81 case Tuple:
82 break;
83 }
84 RELEASE_ASSERT_NOT_REACHED();
85 return Air::Oops;
86}
87
88} // namespace JSC::B3::Air
89
90#endif // ENABLE(B3_JIT)
91