src/arch/power/isa/formats/integer.isa - public/gem5 - Git at Google

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

 // Copyright (c) 2009 The University of Edinburgh
 // All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met: redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer;
 // redistributions in binary form must reproduce the above copyright
 // notice, this list of conditions and the following disclaimer in the
 // documentation and/or other materials provided with the distribution;
 // neither the name of the copyright holders nor the names of its
 // contributors may be used to endorse or promote products derived from
 // this software without specific prior written permission.
 //
 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 ////////////////////////////////////////////////////////////////////
 //
 // Integer ALU instructions
 //


 // Instruction class constructor template when Rc is set.
 def template IntRcConstructor {{
     %(class_name)s::%(class_name)s(ExtMachInst machInst) :
         %(base_class)s("%(mnemonic)s", machInst, %(op_class)s)
     {
         %(set_reg_idx_arr)s;
         %(constructor)s;
         rcSet = true;
     }
 }};


 // Instruction class constructor template when OE is set.
 def template IntOeConstructor {{
     %(class_name)s::%(class_name)s(ExtMachInst machInst) :
         %(base_class)s("%(mnemonic)s", machInst, %(op_class)s)
     {
         %(set_reg_idx_arr)s;
         %(constructor)s;
         oeSet = true;
     }
 }};


 // Instruction class constructor template when both Rc and OE are set.
 def template IntRcOeConstructor {{
     %(class_name)s::%(class_name)s(ExtMachInst machInst) :
         %(base_class)s("%(mnemonic)s", machInst, %(op_class)s)
     {
         %(set_reg_idx_arr)s;
         %(constructor)s;
         rcSet = true;
         oeSet = true;
     }
 }};


 let {{

 readXERCode = 'Xer xer = XER;'

 setXERCode = 'XER = xer;'

 computeCR0Code = '''
     Cr cr = CR;
     cr.cr0 = makeCRField((int32_t)%(result)s, (int32_t)0, xer.so);
     CR = cr;
 '''

 computeCACode = '''
     if (findCarry(32, %(result)s, %(inputa)s, %(inputb)s)) {
         xer.ca = 1;
     } else {
         xer.ca = 0;
     }
 '''

 computeOVCode = '''
     if (findOverflow(32, %(result)s, %(inputa)s, %(inputb)s)) {
         xer.ov = 1;
         xer.so = 1;
     } else {
         xer.ov = 0;
     }
 '''

 computeDivOVCode = '''
     if (divSetOV) {
         xer.ov = 1;
         xer.so = 1;
     } else {
         if (findOverflow(32, %(result)s, %(inputa)s, %(inputb)s)) {
             xer.ov = 1;
             xer.so = 1;
         } else {
             xer.ov = 0;
         }
     }
 '''

 }};


 // A basic integer instruction.
 def format IntOp(code, inst_flags = []) {{
     (header_output, decoder_output, decode_block, exec_output) = \
         GenAluOp(name, Name, 'IntOp', code, inst_flags, BasicDecode,
                  BasicConstructor)
 }};


 // Integer instructions with immediate (signed or unsigned).
 def format IntImmOp(code, inst_flags = []) {{
     (header_output, decoder_output, decode_block, exec_output) = \
         GenAluOp(name, Name, 'IntImmOp', code, inst_flags, BasicDecode,
                  BasicConstructor)
 }};


 // Integer instructions with immediate that perform arithmetic.
 // These instructions all write to Rt and use an altered form of the
 // value in source register Ra, hence the use of src to hold the actual
 // value. The control flags include the use of code to compute the
 // carry bit or the CR0 code.
 def format IntImmArithOp(code, ctrl_flags = [], inst_flags = []) {{

     # Set up the dictionary and deal with control flags
     dict = {'result':'Rt', 'inputa':'src', 'inputb':'imm'}
     if ctrl_flags:
         code += readXERCode
         for val in ctrl_flags:
             if val == 'computeCA':
                 code += computeCACode % dict + setXERCode
             elif val == 'computeCR0':
                 code += computeCR0Code % dict

     # Generate the class
     (header_output, decoder_output, decode_block, exec_output) = \
         GenAluOp(name, Name, 'IntImmOp', code, inst_flags, BasicDecode,
                  BasicConstructor)
 }};


 // Integer instructions with immediate that perform arithmetic but use
 // the value 0 when Ra == 0. We generate two versions of each instruction
 // corresponding to these two different scenarios. The correct version is
 // determined at decode (see the CheckRaDecode template).
 def format IntImmArithCheckRaOp(code, code_ra0, inst_flags = []) {{

     # First the version where Ra is non-zero
     (header_output, decoder_output, decode_block, exec_output) = \
         GenAluOp(name, Name, 'IntImmOp', code, inst_flags,
                  CheckRaDecode, BasicConstructor)

     # Now another version where Ra == 0
     (header_output_ra0, decoder_output_ra0, _, exec_output_ra0) = \
         GenAluOp(name, Name + 'RaZero', 'IntImmOp', code_ra0, inst_flags,
                  CheckRaDecode, BasicConstructor)

     # Finally, add to the other outputs
     header_output += header_output_ra0
     decoder_output += decoder_output_ra0
     exec_output += exec_output_ra0
 }};


 // Integer instructions with immediate that perform logic operations.
 // All instructions write to Ra and use Rs as a source register. Some
 // also compute the CR0 code too.
 def format IntImmLogicOp(code, computeCR0 = 0, inst_flags = []) {{

     # Set up the dictionary and deal with computing CR0
     dict = {'result':'Ra'}
     if computeCR0:
         code += readXERCode + computeCR0Code % dict

     # Generate the class
     (header_output, decoder_output, decode_block, exec_output) = \
         GenAluOp(name, Name, 'IntImmOp', code, inst_flags, BasicDecode,
                  BasicConstructor)
 }};


 // Integer instructions that perform logic operations. The result is
 // always written into Ra. All instructions have 2 versions depending on
 // whether the Rc bit is set to compute the CR0 code. This is determined
 // at decode as before.
 def format IntLogicOp(code, inst_flags = []) {{
     dict = {'result':'Ra'}

     # Code when Rc is set
     code_rc1 = code + readXERCode + computeCR0Code % dict

     # Generate the first class
     (header_output, decoder_output, decode_block, exec_output) = \
         GenAluOp(name, Name, 'IntOp', code, inst_flags,
                  CheckRcDecode, BasicConstructor)

     # Generate the second class
     (header_output_rc1, decoder_output_rc1, _, exec_output_rc1) = \
         GenAluOp(name, Name + 'RcSet', 'IntOp', code_rc1, inst_flags,
                  CheckRcDecode, IntRcConstructor)

     # Finally, add to the other outputs
     header_output += header_output_rc1
     decoder_output += decoder_output_rc1
     exec_output += exec_output_rc1
 }};


 // Integer instructions with a shift amount. As above, except inheriting
 // from the IntShiftOp class.
 def format IntShiftOp(code, inst_flags = []) {{
     dict = {'result':'Ra'}

     # Code when Rc is set
     code_rc1 = code + readXERCode + computeCR0Code % dict

     # Generate the first class
     (header_output, decoder_output, decode_block, exec_output) = \
         GenAluOp(name, Name, 'IntShiftOp', code, inst_flags,
                  CheckRcDecode, BasicConstructor)

     # Generate the second class
     (header_output_rc1, decoder_output_rc1, _, exec_output_rc1) = \
         GenAluOp(name, Name + 'RcSet', 'IntShiftOp', code_rc1, inst_flags,
                  CheckRcDecode, IntRcConstructor)

     # Finally, add to the other outputs
     header_output += header_output_rc1
     decoder_output += decoder_output_rc1
     exec_output += exec_output_rc1
 }};


 // Instructions in this format are all reduced to the form Rt = src1 + src2,
 // therefore we just give src1 and src2 definitions. In working out the
 // template we first put in the definitions of the variables and then
 // the code for the addition. We also deal with computing the carry flag
 // if required.
 //
 // We generate 4 versions of each instruction. This correspond to the
 // different combinations of having the OE bit set or unset (which controls
 // whether the overflow flag is computed) and the Rc bit set or unset too
 // (which controls whether the CR0 code is computed).
 def format IntSumOp(src1, src2, ca = {{ 0 }}, computeCA = 0,
                     inst_flags = []) {{

     # The result is always in Rt, but the source values vary
     dict = {'result':'Rt', 'inputa':'src1', 'inputb':'src2'}

     # Add code to set up variables and do the sum
     code  = 'uint32_t src1 = ' + src1 + ';\n'
     code += 'uint32_t src2 = ' + src2 + ';\n'
     code += 'uint32_t ca = ' + ca + ';\n'
     code += 'Rt = src1 + src2 + ca;\n'

     # Add code for calculating the carry, if needed
     if computeCA:
         code += computeCACode % dict + setXERCode

     # Setup the 4 code versions and add code to access XER if necessary
     code_rc1 = readXERCode + code
     code_oe1 = readXERCode + code + computeOVCode % dict + setXERCode
     code_rc1_oe1 = readXERCode + code + computeOVCode % dict + setXERCode
     if (computeCA or ca == 'xer.ca'):
         code = readXERCode + code
     code_rc1 += computeCR0Code % dict
     code_rc1_oe1 += computeCR0Code % dict

     # Generate the classes
     (header_output, decoder_output, decode_block, exec_output) = \
         GenAluOp(name, Name, 'IntOp', code, inst_flags,
                  CheckRcOeDecode, BasicConstructor)
     (header_output_rc1, decoder_output_rc1, _, exec_output_rc1) = \
         GenAluOp(name, Name + 'RcSet', 'IntOp', code_rc1, inst_flags,
                  CheckRcOeDecode, IntRcConstructor)
     (header_output_oe1, decoder_output_oe1, _, exec_output_oe1) = \
         GenAluOp(name, Name + 'OeSet', 'IntOp', code_oe1, inst_flags,
                  CheckRcOeDecode, IntOeConstructor)
     (header_output_rc1_oe1, decoder_output_rc1_oe1, _, exec_output_rc1_oe1) = \
         GenAluOp(name, Name + 'RcSetOeSet', 'IntOp', code_rc1_oe1,
                  inst_flags, CheckRcOeDecode, IntRcOeConstructor)

     # Finally, add to the other outputs
     header_output += \
         header_output_rc1 + header_output_oe1 + header_output_rc1_oe1
     decoder_output += \
         decoder_output_rc1 + decoder_output_oe1 + decoder_output_rc1_oe1
     exec_output += \
         exec_output_rc1 + exec_output_oe1 + exec_output_rc1_oe1

 }};


 // Instructions that use source registers Ra and Rb, with the result
 // placed into Rt. Basically multiply and divide instructions. The
 // carry bit is never set, but overflow can be calculated. Division
 // explicitly sets the overflow bit in certain situations and this is
 // dealt with using the 'divSetOV' boolean in decoder.isa. We generate
 // two versions of each instruction to deal with the Rc bit.
 def format IntArithOp(code, computeOV = 0, inst_flags = []) {{

     # The result is always in Rt, but the source values vary
     dict = {'result':'Rt', 'inputa':'src1', 'inputb':'src2'}

     # Deal with setting the overflow flag
     if computeOV:
         code = 'bool divSetOV = false;\n' + code
         code += computeDivOVCode % dict + setXERCode

     # Setup the 2 code versions and add code to access XER if necessary
     code_rc1 = readXERCode + code + computeCR0Code % dict
     if computeOV:
         code = readXERCode + code

     # Generate the classes
     (header_output, decoder_output, decode_block, exec_output) = \
         GenAluOp(name, Name, 'IntOp', code, inst_flags,
                  CheckRcDecode, BasicConstructor)

     # Generate the second class
     (header_output_rc1, decoder_output_rc1, _, exec_output_rc1) = \
         GenAluOp(name, Name + 'RcSet', 'IntOp', code_rc1, inst_flags,
                  CheckRcDecode, IntRcConstructor)

     # Finally, add to the other outputs
     header_output += header_output_rc1
     decoder_output += decoder_output_rc1
     exec_output += exec_output_rc1
 }};


 // A special format for rotate instructions which use certain fields
 // from the instruction's binary encoding. We need two versions for each
 // instruction to deal with the Rc bit.
 def format IntRotateOp(code, inst_flags = []) {{

     # The result is always in Ra
     dict = {'result':'Ra'}

     # Setup the code for when Rc is set
     code_rc1 = readXERCode + code + computeCR0Code % dict

     # Generate the first class
     (header_output, decoder_output, decode_block, exec_output) = \
         GenAluOp(name, Name, 'IntRotateOp', code, inst_flags,
                  CheckRcDecode, BasicConstructor)

     # Generate the second class
     (header_output_rc1, decoder_output_rc1, _, exec_output_rc1) = \
         GenAluOp(name, Name + 'RcSet', 'IntRotateOp', code_rc1, inst_flags,
                  CheckRcDecode, IntRcConstructor)

     # Finally, add to the other outputs
     header_output += header_output_rc1
     decoder_output += decoder_output_rc1
     exec_output += exec_output_rc1
 }};
	// -- mode:c++ --

	// Copyright (c) 2009 The University of Edinburgh
	// All rights reserved.
	//
	// Redistribution and use in source and binary forms, with or without
	// modification, are permitted provided that the following conditions are
	// met: redistributions of source code must retain the above copyright
	// notice, this list of conditions and the following disclaimer;
	// redistributions in binary form must reproduce the above copyright
	// notice, this list of conditions and the following disclaimer in the
	// documentation and/or other materials provided with the distribution;
	// neither the name of the copyright holders nor the names of its
	// contributors may be used to endorse or promote products derived from
	// this software without specific prior written permission.
	//
	// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

	////////////////////////////////////////////////////////////////////
	//
	// Integer ALU instructions
	//


	// Instruction class constructor template when Rc is set.
	def template IntRcConstructor {{
	%(class_name)s::%(class_name)s(ExtMachInst machInst) :
	%(base_class)s("%(mnemonic)s", machInst, %(op_class)s)
	{
	%(set_reg_idx_arr)s;
	%(constructor)s;
	rcSet = true;
	}
	}};


	// Instruction class constructor template when OE is set.
	def template IntOeConstructor {{
	%(class_name)s::%(class_name)s(ExtMachInst machInst) :
	%(base_class)s("%(mnemonic)s", machInst, %(op_class)s)
	{
	%(set_reg_idx_arr)s;
	%(constructor)s;
	oeSet = true;
	}
	}};


	// Instruction class constructor template when both Rc and OE are set.
	def template IntRcOeConstructor {{
	%(class_name)s::%(class_name)s(ExtMachInst machInst) :
	%(base_class)s("%(mnemonic)s", machInst, %(op_class)s)
	{
	%(set_reg_idx_arr)s;
	%(constructor)s;
	rcSet = true;
	oeSet = true;
	}
	}};


	let {{

	readXERCode = 'Xer xer = XER;'

	setXERCode = 'XER = xer;'

	computeCR0Code = '''
	Cr cr = CR;
	cr.cr0 = makeCRField((int32_t)%(result)s, (int32_t)0, xer.so);
	CR = cr;
	'''

	computeCACode = '''
	if (findCarry(32, %(result)s, %(inputa)s, %(inputb)s)) {
	xer.ca = 1;
	} else {
	xer.ca = 0;
	}
	'''

	computeOVCode = '''
	if (findOverflow(32, %(result)s, %(inputa)s, %(inputb)s)) {
	xer.ov = 1;
	xer.so = 1;
	} else {
	xer.ov = 0;
	}
	'''

	computeDivOVCode = '''
	if (divSetOV) {
	xer.ov = 1;
	xer.so = 1;
	} else {
	if (findOverflow(32, %(result)s, %(inputa)s, %(inputb)s)) {
	xer.ov = 1;
	xer.so = 1;
	} else {
	xer.ov = 0;
	}
	}
	'''

	}};


	// A basic integer instruction.
	def format IntOp(code, inst_flags = []) {{
	(header_output, decoder_output, decode_block, exec_output) = \
	GenAluOp(name, Name, 'IntOp', code, inst_flags, BasicDecode,
	BasicConstructor)
	}};


	// Integer instructions with immediate (signed or unsigned).
	def format IntImmOp(code, inst_flags = []) {{
	(header_output, decoder_output, decode_block, exec_output) = \
	GenAluOp(name, Name, 'IntImmOp', code, inst_flags, BasicDecode,
	BasicConstructor)
	}};


	// Integer instructions with immediate that perform arithmetic.
	// These instructions all write to Rt and use an altered form of the
	// value in source register Ra, hence the use of src to hold the actual
	// value. The control flags include the use of code to compute the
	// carry bit or the CR0 code.
	def format IntImmArithOp(code, ctrl_flags = [], inst_flags = []) {{

	# Set up the dictionary and deal with control flags
	dict = {'result':'Rt', 'inputa':'src', 'inputb':'imm'}
	if ctrl_flags:
	code += readXERCode
	for val in ctrl_flags:
	if val == 'computeCA':
	code += computeCACode % dict + setXERCode
	elif val == 'computeCR0':
	code += computeCR0Code % dict

	# Generate the class
	(header_output, decoder_output, decode_block, exec_output) = \
	GenAluOp(name, Name, 'IntImmOp', code, inst_flags, BasicDecode,
	BasicConstructor)
	}};


	// Integer instructions with immediate that perform arithmetic but use
	// the value 0 when Ra == 0. We generate two versions of each instruction
	// corresponding to these two different scenarios. The correct version is
	// determined at decode (see the CheckRaDecode template).
	def format IntImmArithCheckRaOp(code, code_ra0, inst_flags = []) {{

	# First the version where Ra is non-zero
	(header_output, decoder_output, decode_block, exec_output) = \
	GenAluOp(name, Name, 'IntImmOp', code, inst_flags,
	CheckRaDecode, BasicConstructor)

	# Now another version where Ra == 0
	(header_output_ra0, decoder_output_ra0, _, exec_output_ra0) = \
	GenAluOp(name, Name + 'RaZero', 'IntImmOp', code_ra0, inst_flags,
	CheckRaDecode, BasicConstructor)

	# Finally, add to the other outputs
	header_output += header_output_ra0
	decoder_output += decoder_output_ra0
	exec_output += exec_output_ra0
	}};


	// Integer instructions with immediate that perform logic operations.
	// All instructions write to Ra and use Rs as a source register. Some
	// also compute the CR0 code too.
	def format IntImmLogicOp(code, computeCR0 = 0, inst_flags = []) {{

	# Set up the dictionary and deal with computing CR0
	dict = {'result':'Ra'}
	if computeCR0:
	code += readXERCode + computeCR0Code % dict

	# Generate the class
	(header_output, decoder_output, decode_block, exec_output) = \
	GenAluOp(name, Name, 'IntImmOp', code, inst_flags, BasicDecode,
	BasicConstructor)
	}};


	// Integer instructions that perform logic operations. The result is
	// always written into Ra. All instructions have 2 versions depending on
	// whether the Rc bit is set to compute the CR0 code. This is determined
	// at decode as before.
	def format IntLogicOp(code, inst_flags = []) {{
	dict = {'result':'Ra'}

	# Code when Rc is set
	code_rc1 = code + readXERCode + computeCR0Code % dict

	# Generate the first class
	(header_output, decoder_output, decode_block, exec_output) = \
	GenAluOp(name, Name, 'IntOp', code, inst_flags,
	CheckRcDecode, BasicConstructor)

	# Generate the second class
	(header_output_rc1, decoder_output_rc1, _, exec_output_rc1) = \
	GenAluOp(name, Name + 'RcSet', 'IntOp', code_rc1, inst_flags,
	CheckRcDecode, IntRcConstructor)

	# Finally, add to the other outputs
	header_output += header_output_rc1
	decoder_output += decoder_output_rc1
	exec_output += exec_output_rc1
	}};


	// Integer instructions with a shift amount. As above, except inheriting
	// from the IntShiftOp class.
	def format IntShiftOp(code, inst_flags = []) {{
	dict = {'result':'Ra'}

	# Code when Rc is set
	code_rc1 = code + readXERCode + computeCR0Code % dict

	# Generate the first class
	(header_output, decoder_output, decode_block, exec_output) = \
	GenAluOp(name, Name, 'IntShiftOp', code, inst_flags,
	CheckRcDecode, BasicConstructor)

	# Generate the second class
	(header_output_rc1, decoder_output_rc1, _, exec_output_rc1) = \
	GenAluOp(name, Name + 'RcSet', 'IntShiftOp', code_rc1, inst_flags,
	CheckRcDecode, IntRcConstructor)

	# Finally, add to the other outputs
	header_output += header_output_rc1
	decoder_output += decoder_output_rc1
	exec_output += exec_output_rc1
	}};


	// Instructions in this format are all reduced to the form Rt = src1 + src2,
	// therefore we just give src1 and src2 definitions. In working out the
	// template we first put in the definitions of the variables and then
	// the code for the addition. We also deal with computing the carry flag
	// if required.
	//
	// We generate 4 versions of each instruction. This correspond to the
	// different combinations of having the OE bit set or unset (which controls
	// whether the overflow flag is computed) and the Rc bit set or unset too
	// (which controls whether the CR0 code is computed).
	def format IntSumOp(src1, src2, ca = {{ 0 }}, computeCA = 0,
	inst_flags = []) {{

	# The result is always in Rt, but the source values vary
	dict = {'result':'Rt', 'inputa':'src1', 'inputb':'src2'}

	# Add code to set up variables and do the sum
	code = 'uint32_t src1 = ' + src1 + ';\n'
	code += 'uint32_t src2 = ' + src2 + ';\n'
	code += 'uint32_t ca = ' + ca + ';\n'
	code += 'Rt = src1 + src2 + ca;\n'

	# Add code for calculating the carry, if needed
	if computeCA:
	code += computeCACode % dict + setXERCode

	# Setup the 4 code versions and add code to access XER if necessary
	code_rc1 = readXERCode + code
	code_oe1 = readXERCode + code + computeOVCode % dict + setXERCode
	code_rc1_oe1 = readXERCode + code + computeOVCode % dict + setXERCode
	if (computeCA or ca == 'xer.ca'):
	code = readXERCode + code
	code_rc1 += computeCR0Code % dict
	code_rc1_oe1 += computeCR0Code % dict

	# Generate the classes
	(header_output, decoder_output, decode_block, exec_output) = \
	GenAluOp(name, Name, 'IntOp', code, inst_flags,
	CheckRcOeDecode, BasicConstructor)
	(header_output_rc1, decoder_output_rc1, _, exec_output_rc1) = \
	GenAluOp(name, Name + 'RcSet', 'IntOp', code_rc1, inst_flags,
	CheckRcOeDecode, IntRcConstructor)
	(header_output_oe1, decoder_output_oe1, _, exec_output_oe1) = \
	GenAluOp(name, Name + 'OeSet', 'IntOp', code_oe1, inst_flags,
	CheckRcOeDecode, IntOeConstructor)
	(header_output_rc1_oe1, decoder_output_rc1_oe1, _, exec_output_rc1_oe1) = \
	GenAluOp(name, Name + 'RcSetOeSet', 'IntOp', code_rc1_oe1,
	inst_flags, CheckRcOeDecode, IntRcOeConstructor)

	# Finally, add to the other outputs
	header_output += \
	header_output_rc1 + header_output_oe1 + header_output_rc1_oe1
	decoder_output += \
	decoder_output_rc1 + decoder_output_oe1 + decoder_output_rc1_oe1
	exec_output += \
	exec_output_rc1 + exec_output_oe1 + exec_output_rc1_oe1

	}};


	// Instructions that use source registers Ra and Rb, with the result
	// placed into Rt. Basically multiply and divide instructions. The
	// carry bit is never set, but overflow can be calculated. Division
	// explicitly sets the overflow bit in certain situations and this is
	// dealt with using the 'divSetOV' boolean in decoder.isa. We generate
	// two versions of each instruction to deal with the Rc bit.
	def format IntArithOp(code, computeOV = 0, inst_flags = []) {{

	# The result is always in Rt, but the source values vary
	dict = {'result':'Rt', 'inputa':'src1', 'inputb':'src2'}

	# Deal with setting the overflow flag
	if computeOV:
	code = 'bool divSetOV = false;\n' + code
	code += computeDivOVCode % dict + setXERCode

	# Setup the 2 code versions and add code to access XER if necessary
	code_rc1 = readXERCode + code + computeCR0Code % dict
	if computeOV:
	code = readXERCode + code

	# Generate the classes
	(header_output, decoder_output, decode_block, exec_output) = \
	GenAluOp(name, Name, 'IntOp', code, inst_flags,
	CheckRcDecode, BasicConstructor)

	# Generate the second class
	(header_output_rc1, decoder_output_rc1, _, exec_output_rc1) = \
	GenAluOp(name, Name + 'RcSet', 'IntOp', code_rc1, inst_flags,
	CheckRcDecode, IntRcConstructor)

	# Finally, add to the other outputs
	header_output += header_output_rc1
	decoder_output += decoder_output_rc1
	exec_output += exec_output_rc1
	}};


	// A special format for rotate instructions which use certain fields
	// from the instruction's binary encoding. We need two versions for each
	// instruction to deal with the Rc bit.
	def format IntRotateOp(code, inst_flags = []) {{

	# The result is always in Ra
	dict = {'result':'Ra'}

	# Setup the code for when Rc is set
	code_rc1 = readXERCode + code + computeCR0Code % dict

	# Generate the first class
	(header_output, decoder_output, decode_block, exec_output) = \
	GenAluOp(name, Name, 'IntRotateOp', code, inst_flags,
	CheckRcDecode, BasicConstructor)

	# Generate the second class
	(header_output_rc1, decoder_output_rc1, _, exec_output_rc1) = \
	GenAluOp(name, Name + 'RcSet', 'IntRotateOp', code_rc1, inst_flags,
	CheckRcDecode, IntRcConstructor)

	# Finally, add to the other outputs
	header_output += header_output_rc1
	decoder_output += decoder_output_rc1
	exec_output += exec_output_rc1
	}};