gem5 - gem5

Age	Commit message (Collapse)	Author
2015-07-17	x86: decode instructions with vex prefix	Nilay Vaish
	This patch updates the x86 decoder so that it can decode instructions with vex prefix. It also updates the isa with opcodes from vex opcode maps 1, 2 and 3. Note that none of the instructions have been implemented yet. The implementations would be provided in due course of time.
2014-12-04	x86: Rework opcode parsing to support 3 byte opcodes properly.	Gabe Black
	Instead of counting the number of opcode bytes in an instruction and recording each byte before the actual opcode, we can represent the path we took to get to the actual opcode byte by using a type code. That has a couple of advantages. First, we can disambiguate the properties of opcodes of the same length which have different properties. Second, it reduces the amount of data stored in an ExtMachInst, making them slightly easier/faster to create and process. This also adds some flexibility as far as how different types of opcodes are handled, which might come in handy if we decide to support VEX or XOP instructions. This change also adds tables to support properly decoding 3 byte opcodes. Before we would fall off the end of some arrays, on top of the ambiguity described above. This change doesn't measureably affect performance on the twolf benchmark. --HG-- rename : src/arch/x86/isa/decoder/three_byte_opcodes.isa => src/arch/x86/isa/decoder/three_byte_0f38_opcodes.isa rename : src/arch/x86/isa/decoder/three_byte_opcodes.isa => src/arch/x86/isa/decoder/three_byte_0f3a_opcodes.isa
2010-05-23	copyright: Change HP copyright on x86 code to be more friendly	Nathan Binkert

2007-07-30	X86: Add a bitfield to indicate whether or not an REX prefix was present.	Gabe Black
	--HG-- extra : convert_revision : 9c4802f6c6e4eaab36aac900e2c7576682cb0f33
2007-07-20	Add a bitfield to decode based on what prefixes are used.	Gabe Black
	--HG-- extra : convert_revision : 7ff4998b3249ccfe86ae9cbcc63fb910683707f5
2007-06-19	Add a stack size bitfield and expose the mode component of the ExtMachInst.	Gabe Black
	--HG-- extra : convert_revision : aad0ec51745fb94335898b0565bb11c1b399bbee
2007-06-12	Flesh out the bitfields for prefixes.	Gabe Black
	--HG-- extra : convert_revision : 0956b3d3532cba3856deda914d7cc708377b701b
2007-06-12	Add an address size bitfield to the isa description and the ExtMachInst	Gabe Black
	--HG-- extra : convert_revision : f8907ef5ef77e050eeb00d895263b49da4a9b6e9
2007-06-08	Add a bitfield to refer to the opSize member of the extMachInst.	Gabe Black
	--HG-- extra : convert_revision : 1854ebc00a9f3ae8c36cc579de6c3a2b48c0fdb6
2007-03-21	Break out the one and two byte opcodes into different files. Also change ↵	Gabe Black
	what bits decode is done on to reflect where clumps of instructions are. --HG-- extra : convert_revision : 8768676eac25e6a4f0dc50ce2dc576bdcdd6e025
2007-03-05	Stub decoder. This is probably even farther from finished than it looks...	Gabe Black
	--HG-- extra : convert_revision : a39a158fec4560f6eb7a6987592c473677c0b1ba