xref: /gem5/src/arch/x86/isa/formats/multi.isa

// -*- mode:c++ -*-

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// Authors: Gabe Black

////////////////////////////////////////////////////////////////////
//
// Instructions that do the same thing to multiple sets of arguments.
//

output header {{
}};

output decoder {{
}};

output exec {{
}};

let {{
    multiops = {}
}};

def format MultiOp(code, switchVal, opTags, *opt_flags) {{
    # Loads and stores that bring in and write out values from the
    # instructions. These are determined by the input and output tags,
    # and the resulting instruction will have the right number of micro ops,
    # or could be implemented as an atomic macro op.
    instNames = []
    for tagSet in opTags:
        loads = []
        stores = []
        postfix = ''
        for tag in tagSet:
            postfix += '_' + tag
        gather_inputs = ''
        if len(loads) + len(stores) == 0:
            # If there are no loads or stores, make this a single instruction.
            iop = InstObjParams(name, Name + postfix, 'X86StaticInst',
                    {"code": code, "gather_inputs": gather_inputs},
                    opt_flags)
        else:
            # Build up a macro op. We'll punt on this for now
            pass

    decodeBlob = 'switch(%s) {\n' % switchVal
    counter = 0
    for inst in instNames:
        decodeBlob += '%d: return (X86StaticInst *)(new %s(machInst));\n' % \
                      (counter, inst)
        counter += 1
    decodeBlob += '}\n'
    # decode_block = BasicDecodeWithMnemonic.subst(iop)
}};