Source/JavaScriptCore/jit/JITArithmetic32_64.cpp

/*
* Copyright (C) 2008-2019 Apple Inc. All rights reserved.
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* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
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*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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#include "config.h"

#if ENABLE(JIT)
#if USE(JSVALUE32_64)
#include "JIT.h"

#include "CodeBlock.h"
#include "JITInlines.h"
#include "JSArray.h"
#include "JSFunction.h"
#include "Interpreter.h"
#include "JSCInlines.h"
#include "ResultType.h"
#include "SlowPathCall.h"


namespace JSC {

void JIT::emit_op_unsigned(const Instruction* currentInstruction)
{
    auto bytecode = currentInstruction->as<OpUnsigned>();
    VirtualRegister result = bytecode.m_dst;
    VirtualRegister op1 = bytecode.m_operand;
    
    emitGetVirtualRegister(op1, regT1, regT0);
    
    addSlowCase(branchIfNotInt32(regT1));
    addSlowCase(branch32(LessThan, regT0, TrustedImm32(0)));
    emitStoreInt32(result, regT0, result == op1);
}

void JIT::emit_op_inc(const Instruction* currentInstruction)
{
    auto bytecode = currentInstruction->as<OpInc>();
    VirtualRegister srcDst = bytecode.m_srcDst;

    emitGetVirtualRegister(srcDst, regT1, regT0);

    addSlowCase(branchIfNotInt32(regT1));
    addSlowCase(branchAdd32(Overflow, TrustedImm32(1), regT0));
    emitStoreInt32(srcDst, regT0, true);
}

void JIT::emit_op_dec(const Instruction* currentInstruction)
{
    auto bytecode = currentInstruction->as<OpDec>();
    VirtualRegister srcDst = bytecode.m_srcDst;

    emitGetVirtualRegister(srcDst, regT1, regT0);

    addSlowCase(branchIfNotInt32(regT1));
    addSlowCase(branchSub32(Overflow, TrustedImm32(1), regT0));
    emitStoreInt32(srcDst, regT0, true);
}

// Mod (%)

/* ------------------------------ BEGIN: OP_MOD ------------------------------ */

void JIT::emit_op_mod(const Instruction* currentInstruction)
{
    JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_mod);
    slowPathCall.call();
}

void JIT::emitSlow_op_mod(const Instruction*, Vector<SlowCaseEntry>::iterator&)
{
    // We would have really useful assertions here if it wasn't for the compiler's
    // insistence on attribute noreturn.
    // RELEASE_ASSERT_NOT_REACHED();
}

/* ------------------------------ END: OP_MOD ------------------------------ */

} // namespace JSC

#endif // USE(JSVALUE32_64)
#endif // ENABLE(JIT)