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Consider using opcodesDB.

List of all instructions found in Intel and AMD documentations, listed into XML files for easy parsing. Each instruction in the XML file contains:

• Instruction mnemonic.
• Instruction arguments.
• Instruction opcode.
• Instruction opcode encoding.
• Instruction 64 bit mode support.
• Instruction 32 bit mode support.
• Instruction CPUID flags.
• Instruction operands encoding.
• Instruction description.

NOTE: Some fields listed above may not exists in other instructions.

For each XML file there is a DTD file associated which is used to ensure that the XML file follows the same rules for all XML files.

• raw.x86.Intel.AZ.xml: Contains all instructions found in “Intel® 64 and IA-32 Architectures Software Developer Manuals volume 2”.
• *raw.x86.Intel.AVX512_r22.xml: Contains all instructions found in “Intel® Architecture Instruction Set Extensions Programming Reference 319433-022”.
• raw.x86.Intel.AVX512_r24.xml: Contains all instructions found in “Intel® Architecture Instruction Set Extensions Programming Reference 319433-024”.
• raw.x86.AMD.3DNow.xml: Contains all instructions found in "AMD 3DNow! Technology Manual".
• raw.x86.AMD.SSE5.xml: Contains all instructions found in "AMD 128-Bit SSE5 Instruction Set".
• raw.x86.AMD.XOP.xml: Contains all instructions found in "AMD64 Architecture Programmers Manual Volume 6: 128-Bit and 256-Bit XOP and FMA4 Instructions".

* means deprecated.

• x32m = 32-bit mode support.
• x64m = 64-bit mode support.
• mnem = Instruction Mnemonic.
• args = Instruction Arguments.
• opc = Opcodes.
• openc = Operand Encoding name.
• dscrp = Description.
• oprndenc = Instruction Operand Encoding.
• oprnd1 = Operand 1.
• oprnd2 = Operand 2.
• oprnd3 = Operand 3.
• oprnd4 = Operand 4.

NOTE: FOR THE REST OF KEYS YOU SHOULD REFER TO INTEL/AMD DOCUMENTATIONS!

Here's a simple example of ADDPD instruction.

<common>
	<brief>ADDPD--Add Packed Double-Precision Floating-Point Values.</brief>
	<ins x32m="V" x64m="V">
		<mnem>ADDPD</mnem>
		<args>xmm1,xmm2/m128</args>
		<opc openc="RM">66 0F 58 /r</opc>
		<cpuid>
			<flag>SSE2</flag>
		</cpuid>
		<dscrp>Add packed double-precision floating-point values from xmm2/m128 to xmm1.</dscrp>
	</ins>
	<ins x32m="V" x64m="V">
		<mnem>VADDPD</mnem>
		<args>xmm1,xmm2,xmm3/m128</args>
		<opc openc="RVM">VEX.NDS.128.66.0F.WIG 58 /r</opc>
		<cpuid>
			<flag>AVX</flag>
		</cpuid>
		<dscrp>Add packed double-precision floating-point values from xmm3/mem to xmm2 and stores result in xmm1.</dscrp>
	</ins>
	<ins x32m="V" x64m="V">
		<mnem>VADDPD</mnem>
		<args>ymm1,ymm2,ymm3/m256</args>
		<opc openc="RVM">VEX.NDS.256.66.0F.WIG 58 /r</opc>
		<cpuid>
			<flag>AVX</flag>
		</cpuid>
		<dscrp>Add packed double-precision floating-point values from ymm3/mem to ymm2 and stores result in ymm1.</dscrp>
	</ins>
	<oprndenc openc="RM">
		<oprnd1>ModRM:reg(r,w)</oprnd1>
		<oprnd2>ModRM:r/m(r)</oprnd2>
		<oprnd3>NA</oprnd3>
		<oprnd4>NA</oprnd4>
	</oprndenc>
	<oprndenc openc="RVM">
		<oprnd1>ModRM:reg(w)</oprnd1>
		<oprnd2>VEX.vvvv(r)</oprnd2>
		<oprnd3>ModRM:r/m(r)</oprnd3>
		<oprnd4>NA</oprnd4>
	</oprndenc>
</common>