1/*
2 * Copyright (C) 2015-2019 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#include "config.h"
27#include "JITLeftShiftGenerator.h"
28
29#if ENABLE(JIT)
30
31namespace JSC {
32
33void JITLeftShiftGenerator::generateFastPath(CCallHelpers& jit)
34{
35 ASSERT(m_scratchGPR != InvalidGPRReg);
36 ASSERT(m_scratchGPR != m_left.payloadGPR());
37 ASSERT(m_scratchGPR != m_right.payloadGPR());
38#if USE(JSVALUE32_64)
39 ASSERT(m_scratchGPR != m_left.tagGPR());
40 ASSERT(m_scratchGPR != m_right.tagGPR());
41#endif
42
43 ASSERT(!m_leftOperand.isConstInt32() || !m_rightOperand.isConstInt32());
44
45 m_didEmitFastPath = true;
46
47 if (m_rightOperand.isConstInt32()) {
48 // Try to do (intVar << intConstant).
49 m_slowPathJumpList.append(jit.branchIfNotInt32(m_left));
50
51 jit.moveValueRegs(m_left, m_result);
52 jit.lshift32(CCallHelpers::Imm32(m_rightOperand.asConstInt32()), m_result.payloadGPR());
53
54 } else {
55 // Try to do (intConstant << intVar) or (intVar << intVar).
56 m_slowPathJumpList.append(jit.branchIfNotInt32(m_right));
57
58 GPRReg rightOperandGPR = m_right.payloadGPR();
59 if (rightOperandGPR == m_result.payloadGPR()) {
60 jit.move(rightOperandGPR, m_scratchGPR);
61 rightOperandGPR = m_scratchGPR;
62 }
63
64 if (m_leftOperand.isConstInt32()) {
65#if USE(JSVALUE32_64)
66 jit.move(m_right.tagGPR(), m_result.tagGPR());
67#endif
68 jit.move(CCallHelpers::Imm32(m_leftOperand.asConstInt32()), m_result.payloadGPR());
69 } else {
70 m_slowPathJumpList.append(jit.branchIfNotInt32(m_left));
71 jit.moveValueRegs(m_left, m_result);
72 }
73
74 jit.lshift32(rightOperandGPR, m_result.payloadGPR());
75 }
76
77#if USE(JSVALUE64)
78 jit.or64(GPRInfo::numberTagRegister, m_result.payloadGPR());
79#endif
80}
81
82} // namespace JSC
83
84#endif // ENABLE(JIT)
85