1/*
2 * Copyright (C) 2015, 2016 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 "JITNegGenerator.h"
28
29#include "ArithProfile.h"
30
31#if ENABLE(JIT)
32
33namespace JSC {
34
35JITMathICInlineResult JITNegGenerator::generateInline(CCallHelpers& jit, MathICGenerationState& state, const ArithProfile* arithProfile)
36{
37 ASSERT(m_scratchGPR != InvalidGPRReg);
38 ASSERT(m_scratchGPR != m_src.payloadGPR());
39 ASSERT(m_scratchGPR != m_result.payloadGPR());
40#if USE(JSVALUE32_64)
41 ASSERT(m_scratchGPR != m_src.tagGPR());
42 ASSERT(m_scratchGPR != m_result.tagGPR());
43#endif
44
45 // We default to speculating int32.
46 ObservedType observedTypes = ObservedType().withInt32();
47 if (arithProfile)
48 observedTypes = arithProfile->lhsObservedType();
49 ASSERT_WITH_MESSAGE(!observedTypes.isEmpty(), "We should not attempt to generate anything if we do not have a profile.");
50
51 if (observedTypes.isOnlyNonNumber())
52 return JITMathICInlineResult::DontGenerate;
53
54 if (observedTypes.isOnlyInt32()) {
55 jit.moveValueRegs(m_src, m_result);
56 state.slowPathJumps.append(jit.branchIfNotInt32(m_src));
57 state.slowPathJumps.append(jit.branchTest32(CCallHelpers::Zero, m_src.payloadGPR(), CCallHelpers::TrustedImm32(0x7fffffff)));
58 jit.neg32(m_result.payloadGPR());
59#if USE(JSVALUE64)
60 jit.boxInt32(m_result.payloadGPR(), m_result);
61#endif
62
63 return JITMathICInlineResult::GeneratedFastPath;
64 }
65 if (observedTypes.isOnlyNumber()) {
66 state.slowPathJumps.append(jit.branchIfInt32(m_src));
67 state.slowPathJumps.append(jit.branchIfNotNumber(m_src, m_scratchGPR));
68#if USE(JSVALUE64)
69 if (m_src.payloadGPR() != m_result.payloadGPR()) {
70 jit.move(CCallHelpers::TrustedImm64(static_cast<int64_t>(1ull << 63)), m_result.payloadGPR());
71 jit.xor64(m_src.payloadGPR(), m_result.payloadGPR());
72 } else {
73 jit.move(CCallHelpers::TrustedImm64(static_cast<int64_t>(1ull << 63)), m_scratchGPR);
74 jit.xor64(m_scratchGPR, m_result.payloadGPR());
75 }
76#else
77 jit.moveValueRegs(m_src, m_result);
78 jit.xor32(CCallHelpers::TrustedImm32(1 << 31), m_result.tagGPR());
79#endif
80 return JITMathICInlineResult::GeneratedFastPath;
81 }
82 return JITMathICInlineResult::GenerateFullSnippet;
83}
84
85bool JITNegGenerator::generateFastPath(CCallHelpers& jit, CCallHelpers::JumpList& endJumpList, CCallHelpers::JumpList& slowPathJumpList, const ArithProfile* arithProfile, bool shouldEmitProfiling)
86{
87 ASSERT(m_scratchGPR != m_src.payloadGPR());
88 ASSERT(m_scratchGPR != m_result.payloadGPR());
89 ASSERT(m_scratchGPR != InvalidGPRReg);
90#if USE(JSVALUE32_64)
91 ASSERT(m_scratchGPR != m_src.tagGPR());
92 ASSERT(m_scratchGPR != m_result.tagGPR());
93#endif
94
95 jit.moveValueRegs(m_src, m_result);
96 CCallHelpers::Jump srcNotInt = jit.branchIfNotInt32(m_src);
97
98 // -0 should produce a double, and hence cannot be negated as an int.
99 // The negative int32 0x80000000 doesn't have a positive int32 representation, and hence cannot be negated as an int.
100 slowPathJumpList.append(jit.branchTest32(CCallHelpers::Zero, m_src.payloadGPR(), CCallHelpers::TrustedImm32(0x7fffffff)));
101
102 jit.neg32(m_result.payloadGPR());
103#if USE(JSVALUE64)
104 jit.boxInt32(m_result.payloadGPR(), m_result);
105#endif
106 endJumpList.append(jit.jump());
107
108 srcNotInt.link(&jit);
109 slowPathJumpList.append(jit.branchIfNotNumber(m_src, m_scratchGPR));
110
111 // For a double, all we need to do is to invert the sign bit.
112#if USE(JSVALUE64)
113 jit.move(CCallHelpers::TrustedImm64((int64_t)(1ull << 63)), m_scratchGPR);
114 jit.xor64(m_scratchGPR, m_result.payloadGPR());
115#else
116 jit.xor32(CCallHelpers::TrustedImm32(1 << 31), m_result.tagGPR());
117#endif
118 // The flags of ArithNegate are basic in DFG.
119 // We only need to know if we ever produced a number.
120 if (shouldEmitProfiling && arithProfile && !arithProfile->lhsObservedType().sawNumber() && !arithProfile->didObserveDouble())
121 arithProfile->emitSetDouble(jit);
122 return true;
123}
124
125} // namespace JSC
126
127#endif // ENABLE(JIT)
128