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C++ CCallHelpers::branchIfNotInt32方法代码示例

本文整理汇总了C++中CCallHelpers::branchIfNotInt32方法的典型用法代码示例。如果您正苦于以下问题：C++ CCallHelpers::branchIfNotInt32方法的具体用法？C++ CCallHelpers::branchIfNotInt32怎么用？C++ CCallHelpers::branchIfNotInt32使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类CCallHelpers的用法示例。


在下文中一共展示了CCallHelpers::branchIfNotInt32方法的4个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。

示例1: generateFastPath

void JITBitOrGenerator::generateFastPath(CCallHelpers& jit)
{
    ASSERT(!m_leftOperand.isConstInt32() || !m_rightOperand.isConstInt32());
    
    m_didEmitFastPath = true;
    
    if (m_leftOperand.isConstInt32() || m_rightOperand.isConstInt32()) {
        JSValueRegs var = m_leftOperand.isConstInt32() ? m_right : m_left;
        SnippetOperand& constOpr = m_leftOperand.isConstInt32() ? m_leftOperand : m_rightOperand;
        
        // Try to do intVar | intConstant.
        m_slowPathJumpList.append(jit.branchIfNotInt32(var));
        
        jit.moveValueRegs(var, m_result);
        if (constOpr.asConstInt32()) {
#if USE(JSVALUE64)
            jit.or32(CCallHelpers::Imm32(constOpr.asConstInt32()), m_result.payloadGPR());
            jit.or64(GPRInfo::tagTypeNumberRegister, m_result.payloadGPR());
#else
            jit.or32(CCallHelpers::Imm32(constOpr.asConstInt32()), m_result.payloadGPR());
#endif
        }

    } else {
        ASSERT(!m_leftOperand.isConstInt32() && !m_rightOperand.isConstInt32());
        
        // Try to do intVar | intVar.
        m_slowPathJumpList.append(jit.branchIfNotInt32(m_left));
        m_slowPathJumpList.append(jit.branchIfNotInt32(m_right));

        jit.moveValueRegs(m_left, m_result);
#if USE(JSVALUE64)
        jit.or64(m_right.payloadGPR(), m_result.payloadGPR());
#else
        jit.or32(m_right.payloadGPR(), m_result.payloadGPR());
#endif
    }
}
开发者ID:Comcast，项目名称:WebKitForWayland，代码行数:38，代码来源:JITBitOrGenerator.cpp

示例2: generateInline

JITMathICInlineResult JITNegGenerator::generateInline(CCallHelpers& jit, MathICGenerationState& state, const ArithProfile* arithProfile)
{
    ASSERT(m_scratchGPR != InvalidGPRReg);
    ASSERT(m_scratchGPR != m_src.payloadGPR());
    ASSERT(m_scratchGPR != m_result.payloadGPR());
#if USE(JSVALUE32_64)
    ASSERT(m_scratchGPR != m_src.tagGPR());
    ASSERT(m_scratchGPR != m_result.tagGPR());
#endif

    // We default to speculating int32.
    ObservedType observedTypes = ObservedType().withInt32();
    if (arithProfile)
        observedTypes = arithProfile->lhsObservedType();
    ASSERT_WITH_MESSAGE(!observedTypes.isEmpty(), "We should not attempt to generate anything if we do not have a profile.");

    if (observedTypes.isOnlyNonNumber())
        return JITMathICInlineResult::DontGenerate;

    if (observedTypes.isOnlyInt32()) {
        jit.moveValueRegs(m_src, m_result);
        state.slowPathJumps.append(jit.branchIfNotInt32(m_src));
        state.slowPathJumps.append(jit.branchTest32(CCallHelpers::Zero, m_src.payloadGPR(), CCallHelpers::TrustedImm32(0x7fffffff)));
        jit.neg32(m_result.payloadGPR());
#if USE(JSVALUE64)
        jit.boxInt32(m_result.payloadGPR(), m_result);
#endif

        return JITMathICInlineResult::GeneratedFastPath;
    }
    if (observedTypes.isOnlyNumber()) {
        state.slowPathJumps.append(jit.branchIfInt32(m_src));
        state.slowPathJumps.append(jit.branchIfNotNumber(m_src, m_scratchGPR));
#if USE(JSVALUE64)
        if (m_src.payloadGPR() != m_result.payloadGPR()) {
            jit.move(CCallHelpers::TrustedImm64(static_cast<int64_t>(1ull << 63)), m_result.payloadGPR());
            jit.xor64(m_src.payloadGPR(), m_result.payloadGPR());
        } else {
            jit.move(CCallHelpers::TrustedImm64(static_cast<int64_t>(1ull << 63)), m_scratchGPR);
            jit.xor64(m_scratchGPR, m_result.payloadGPR());
        }
#else
        jit.moveValueRegs(m_src, m_result);
        jit.xor32(CCallHelpers::TrustedImm32(1 << 31), m_result.tagGPR());
#endif
        return JITMathICInlineResult::GeneratedFastPath;
    }
    return JITMathICInlineResult::GenerateFullSnippet;
}
开发者ID:caiolima，项目名称:webkit，代码行数:49，代码来源:JITNegGenerator.cpp

示例3: generateFastPath

bool JITNegGenerator::generateFastPath(CCallHelpers& jit, CCallHelpers::JumpList& endJumpList, CCallHelpers::JumpList& slowPathJumpList, const ArithProfile* arithProfile, bool shouldEmitProfiling)
{
    ASSERT(m_scratchGPR != m_src.payloadGPR());
    ASSERT(m_scratchGPR != m_result.payloadGPR());
    ASSERT(m_scratchGPR != InvalidGPRReg);
#if USE(JSVALUE32_64)
    ASSERT(m_scratchGPR != m_src.tagGPR());
    ASSERT(m_scratchGPR != m_result.tagGPR());
#endif

    jit.moveValueRegs(m_src, m_result);
    CCallHelpers::Jump srcNotInt = jit.branchIfNotInt32(m_src);

    // -0 should produce a double, and hence cannot be negated as an int.
    // The negative int32 0x80000000 doesn't have a positive int32 representation, and hence cannot be negated as an int.
    slowPathJumpList.append(jit.branchTest32(CCallHelpers::Zero, m_src.payloadGPR(), CCallHelpers::TrustedImm32(0x7fffffff)));

    jit.neg32(m_result.payloadGPR());
#if USE(JSVALUE64)
    jit.boxInt32(m_result.payloadGPR(), m_result);
#endif
    endJumpList.append(jit.jump());

    srcNotInt.link(&jit);
    slowPathJumpList.append(jit.branchIfNotNumber(m_src, m_scratchGPR));

    // For a double, all we need to do is to invert the sign bit.
#if USE(JSVALUE64)
    jit.move(CCallHelpers::TrustedImm64((int64_t)(1ull << 63)), m_scratchGPR);
    jit.xor64(m_scratchGPR, m_result.payloadGPR());
#else
    jit.xor32(CCallHelpers::TrustedImm32(1 << 31), m_result.tagGPR());
#endif
    // The flags of ArithNegate are basic in DFG.
    // We only need to know if we ever produced a number.
    if (shouldEmitProfiling && arithProfile && !arithProfile->lhsObservedType().sawNumber() && !arithProfile->didObserveDouble())
        arithProfile->emitSetDouble(jit);
    return true;
}
开发者ID:caiolima，项目名称:webkit，代码行数:39，代码来源:JITNegGenerator.cpp

示例4: generateFastPath

void JITRightShiftGenerator::generateFastPath(CCallHelpers& jit)
{
    ASSERT(m_scratchGPR != InvalidGPRReg);
    ASSERT(m_scratchGPR != m_left.payloadGPR());
    ASSERT(m_scratchGPR != m_right.payloadGPR());
#if USE(JSVALUE32_64)
    ASSERT(m_scratchGPR != m_left.tagGPR());
    ASSERT(m_scratchGPR != m_right.tagGPR());
    ASSERT(m_scratchFPR != InvalidFPRReg);
#endif

    ASSERT(!m_leftOperand.isConstInt32() || !m_rightOperand.isConstInt32());

    m_didEmitFastPath = true;

    if (m_rightOperand.isConstInt32()) {
        // Try to do (intVar >> intConstant).
        CCallHelpers::Jump notInt = jit.branchIfNotInt32(m_left);

        jit.moveValueRegs(m_left, m_result);
        int32_t shiftAmount = m_rightOperand.asConstInt32() & 0x1f;
        if (shiftAmount) {
            if (m_shiftType == SignedShift)
                jit.rshift32(CCallHelpers::Imm32(shiftAmount), m_result.payloadGPR());
            else
                jit.urshift32(CCallHelpers::Imm32(shiftAmount), m_result.payloadGPR());
#if USE(JSVALUE64)
            jit.or64(GPRInfo::tagTypeNumberRegister, m_result.payloadGPR());
#endif
        }

        if (jit.supportsFloatingPointTruncate()) {
            m_endJumpList.append(jit.jump()); // Terminate the above case before emitting more code.

            // Try to do (doubleVar >> intConstant).
            notInt.link(&jit);

            m_slowPathJumpList.append(jit.branchIfNotNumber(m_left, m_scratchGPR));

            jit.unboxDoubleNonDestructive(m_left, m_leftFPR, m_scratchGPR, m_scratchFPR);
            m_slowPathJumpList.append(jit.branchTruncateDoubleToInt32(m_leftFPR, m_scratchGPR));

            if (shiftAmount) {
                if (m_shiftType == SignedShift)
                    jit.rshift32(CCallHelpers::Imm32(shiftAmount), m_scratchGPR);
                else
                    jit.urshift32(CCallHelpers::Imm32(shiftAmount), m_scratchGPR);
            }
            jit.boxInt32(m_scratchGPR, m_result);

        } else
            m_slowPathJumpList.append(notInt);

    } else {
        // Try to do (intConstant >> intVar) or (intVar >> intVar).
        m_slowPathJumpList.append(jit.branchIfNotInt32(m_right));

        CCallHelpers::Jump notInt;
        if (m_leftOperand.isConstInt32()) {
#if USE(JSVALUE32_64)
            jit.move(m_right.tagGPR(), m_result.tagGPR());
#endif
            jit.move(CCallHelpers::Imm32(m_leftOperand.asConstInt32()), m_result.payloadGPR());
        } else {
            notInt = jit.branchIfNotInt32(m_left);
            jit.moveValueRegs(m_left, m_result);
        }

        if (m_shiftType == SignedShift)
            jit.rshift32(m_right.payloadGPR(), m_result.payloadGPR());
        else
            jit.urshift32(m_right.payloadGPR(), m_result.payloadGPR());
#if USE(JSVALUE64)
        jit.or64(GPRInfo::tagTypeNumberRegister, m_result.payloadGPR());
#endif
        if (m_leftOperand.isConstInt32())
            return;

        if (jit.supportsFloatingPointTruncate()) {
            m_endJumpList.append(jit.jump()); // Terminate the above case before emitting more code.

            // Try to do (doubleVar >> intVar).
            notInt.link(&jit);

            m_slowPathJumpList.append(jit.branchIfNotNumber(m_left, m_scratchGPR));
            jit.unboxDoubleNonDestructive(m_left, m_leftFPR, m_scratchGPR, m_scratchFPR);
            m_slowPathJumpList.append(jit.branchTruncateDoubleToInt32(m_leftFPR, m_scratchGPR));

            if (m_shiftType == SignedShift)
                jit.rshift32(m_right.payloadGPR(), m_scratchGPR);
            else
                jit.urshift32(m_right.payloadGPR(), m_scratchGPR);
            jit.boxInt32(m_scratchGPR, m_result);

        } else
            m_slowPathJumpList.append(notInt);
    }
}
开发者ID:EdgarHz，项目名称:webkit，代码行数:98，代码来源:JITRightShiftGenerator.cpp


注：本文中的CCallHelpers::branchIfNotInt32方法示例由纯净天空整理自Github/MSDocs等开源代码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。