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culative file the second file is served as a scaled shadow register file which without context switch the scaled file cannot store some instruction independently some instruction from sse2 sse3 ssse3 require this feature for integer operation for example instruction like pshufb pmaddubsw phsubw phsubd phsubsw phaddw phaddd phaddsw would require loading eax ebx ecx edx from both register files though it was uncommon for an x86 processor to make use of another register file with the same instruction most of time the second file is served as a scale retired file the pentium m architecture still has one dual ported floating point register file 8 entries mm xmm shared with three decoders and the fp register file does not have a shadow register file along with it as its shadow register file architecture did not including floating point functions in processors after p6 the architectural register files are external and located in the processor s backend after the retired file as opposed to the internal register file located in the inner core for register renaming reorder buffer however in core 2 it is now housed within a unit called the register alias table rat located with instruction allocator but have same size of register size as retirement core 2 increased the inner ring bus to 24 bytes allow more than 3 instructions to be decoded and extended its register file from dual ported one read one write to quad ported two read two write register still remain 8 entries in 32 bit and 32 bytes not including 6 segment register and one instruction pointer as they are unable to be access in the file by any code instruction in total file size and expanded to 16 entries in x64 for total 128 bytes size per file from pentium m as its pipeline port and decoder increased but they re located with allocator table instead of code buffer its fp xmm register file are also increase to quad ported 2 read 2 write register still remain 8 entries in 32 bit and extended to 16 entries in x64 mode and number still remain 1 as its shadow register file architecture is not including floating point sse functions in later x86 implementations like nehalem and later processors both integer and floating point registers are now incorporated into a unified octa ported six read and two write general purpose register file 8 8 in 32 bit and 16 16 in x64 per file while the register file extended to 2 with enhanced shadow register file architecture in favorite of executing hyper threading and each thread uses independent register files for its decoder later sandy bridge and onward replaced shadow register table and architectural registers with much large and yet more advance physical register file before decoding to the reorder buffer randered that sandy bridge and onward no longer carry an architectural register on the atom line was the modern simplified revision of p5 it includes single copies of register file share with thread and decoder the register file is a dual port design 8 16 entries gprs 8 16 entries debug register and 8 16 entries condition code are integrated in the same file however it has an eight entries 64 bit shadow based register and an eight entries 64 bit unnamed register that are now separated from main gprs unlike the original p5 design and located after the execution unit and the file of these registers is single ported and not expose to instruction like scaled shadow register file found on core core2 shadow register file are made of architectural registers and bonnell did not due to not have shadow register file architecture however the file can be use for renaming purpose due to lack of out of order execution found on bonnell architecture it also had one copy of xmm floating point register file per thread the difference from nehalem is bonnell do not have a unified register file and has no dedicated register file for its hyper threading instead bonnell uses a separate rename register for its thread despite it is not out of order similar to bonnell larrabee and xeon phi also each have only one general purpose integer register file but the larrabee has up to 16 xmm register files 8 entries per file and the xeon phi has up to 128 avx 512 register files each containing 32 512 bit zmm registers for vector instruction storage which can be as big as l2 cache there are some other of intel s x86 lines that don t have a register file in their internal design geode gx and vortex86 and many embedded processors that aren t pentium compatible or reverse engineered early 80x86 processors therefore most of them don t have a register file for their decoders but their gprs are used individually pentium 4 on the other hand does not have a register file for its decoder as its x86 gprs didn t exist within its structure due to the introduction of a physical unified renaming register file similar to sandy bridge but slightly different due to the inability of pentium 4 to use the register before naming for attempting to replace the architectural register file and skip the x86 decoding scheme instead it uses sse for integer execution and storage before the alu and after result sse2 sse3 ssse3 use the same mechanism as well for its integer operation amd s early design like k6 do not have a register file like intel and do not support shadow register file architecture as its lack of context switch and bypass inverter that are necessary require for a register file to function appropriately instead they use a separate gprs that directly link to a rename register table for its oooe cpu with a dedicated integer decoder and floating decoder the mechanism is similar to intel s pre pentium processor line for example the k6 processor has four int one eight entries temporary scratched register file one eight entries future register file one eight entries fetched register file an eight entries unnamed register file and two fp rename register files two eight entries x87 st file one goes fadd and one goes fmov that directly link with its x86 eax for integer renaming and xmm0 register for floating point renaming but later athlon included shadow register in its front end it s scaled up to 40 entries unified register file for in order integer operation before decoded the register file contain 8 entries scratch register 16 future gprs register file 16 unnamed gprs register file in later amd designs it abandons the shadow register design and favored to k6 architecture with individual gprs direct link design like phenom it has three int register files and two sse register files that are located in the physical register file directly linked with gprs however it scales down to one integer one floating point on bulldozer like early amd designs most of the x86 manufacturers like cyrix via dm p and sis used the same mechanism as well resulting in a lack of integer performance without register renaming for their in order cpu companies like cyrix and amd had to increase cache size in hope to reduce the bottleneck amd s sse integer operation work in a different way than core 2 and pentium 4 it uses its separate renaming integer register to load the value directly before the decode stage though theoretically it will only need a shorter pipeline than intel s sse implementation but generally the cost of branch prediction are much greater and higher missing rate than intel and it would have to take at least two cycles for its sse instruction to be executed regardless of instruction wide as early amds implementations could not execute both fp and int in an sse instruction set like intel s implementation did unlike alpha sparc and mips that only allows one register file to load fetch one operand at the time it would require multiple register files to achieve superscale the arm processor on the other hand does not integrate multiple register files to load fetch instructions arm gprs have no special purpose to the instruction set the arm isa does not require accumulator index and stack base points registers do not have an accumulator and base stack point can only be used in thumb mode any gprs can propagate and store multiple instructions independently in smaller code size that is small enough to be able to fit in one register and its architectural register act as a table and shared with all decoder instructions with simple bank switching between decoders the major difference between arm and other designs is that arm allows to run on the same general purpose register with quick bank switching without requiring additional register file in superscalar despite x86 sharing the same mechanism with arm that its gprs can store any data individually x86 will confront data dependency if more than three non related instructions are stored as its gprs per file are too small eight in 32 bit mode and 16 in 64 bit compared to arm s 13 in 32 bit and 31 in 64 bit for data and it is impossible to have superscalar without multiple register files to feed to its decoder x86 code is big and complex compared to arm because most x86 s front ends have become much larger and much more power hungry than the arm processor in order to be competitive example pentium m core 2 duo bay trail some third party x86 equivalent processors even became noncompetitive with arm due to having no dedicated register file architecture particularly for amd cyrix and via that cannot bring any reasonable performance without register renaming and out of order execution which leave only intel atom to be the only in order x86 processor core in the mobile competition this was until the x86 nehalem processor merged both of its integer and floating point register into one single file and the introduction of a large physical register table and enhanced allocator table in its front end before renaming in its out of order internal core register renaming edit processors that perform register renaming can arrange for each functional unit to write to a subset of the physical register file this arrangement can eliminate the need for multiple write ports per bit cell for large savings in area the resulting register file effectively a stack of register files with single write ports then benefits from replication and subsetting the read ports at the limit this technique would place a stack of 1 write 2 read regfiles at the inputs to each functional unit since regfiles with a small number of ports are often dominated by transistor area it is best not to push this technique to this limit but it is useful all the same register windows edit the sparc isa defines register windows in which the 5 bit architectural names of the registers actually point into a window on a much larger register file with hundreds of entries implementing multiported register files with hundreds of entries requires a large area the register window slides by 16 registers when moved so that each architectural register name can refer to only a small number of registers in the larger array e g architectural register r20 can only refer to physical registers 20 36 52 68 84 100 116 if there are just seven windows in the physical file to save area some sparc implementations implement a 32 entry register file in which each cell has seven bits only one is read and writeable through the external ports but the contents of the bits can be rotated a rotation accomplishes in a single cycle a movement of the register window because most of the wires accomplishing the state movement are local tremendous bandwidth is possible with little power this same technique is used in the r10000 register renaming mapping file which stores a 6 bit virtual register number for each of the physical registers in the renaming file the renaming state is checkpointed whenever a branch is taken so that when a branch is detected to be mispredicted the old renaming state can be recovered in a single cycle see register renaming see also edit sum addressed decoder references edit wikibooks microprocessor design register file register bank arm architecture reference manual pdf arm limited july 2005 retrieved 13 october 2021 a b johan janssen compiler strategies for transport triggered architectures 2001 p 169 p 171 173 energy efficient asymmetrically ported register files by aneesh aggarwal and m franklin 2003 external links edit the wikibook microprocessor design has a page on the topic of register file register file design considerations in dynamically scheduled processors farkas jouppi chow 1995 v t e processor technologies models abstract machine stored program computer finite state machine with datapath hierarchical deterministic finite automaton queue automaton cellular automaton quantum cellular automaton turing machine alternating turing machine universal post turing quantum nondeterministic turing machine probabilistic turing machine hypercomputation zeno machine belt machine stack machine register machines counter pointer random access random access stored program architecture microarchitecture von neumann harvard modified dataflow transport triggered cellular endianness memory access numa huma load store register memory cache hierarchy memory hierarchy virtual memory secondary storage heterogeneous fabric multiprocessing cognitive neuromorphic instruction set architectures types orthogonal instruction set cisc risc application specific edge trips vliw epic misc oisc nisc zisc visc architecture quantum computing comparison addressing modes instruction sets motorola 68000 series vax pdp 11 x86 arm stanford mips mips mips x power power powerpc power isa clipper architecture sparc superh dec alpha etrax cris m32r unicore itanium openrisc risc v microblaze lmc system 3x0 s 360 s 370 s 390 z architecture tilera isa visc architecture epiphany architecture others execution instruction pipelining pipeline stall operand forwarding classic risc pipeline hazards data dependency structural control false sharing out of order scoreboarding tomasulo algorithm reservation station re order buffer register renaming wide issue speculative branch prediction memory dependence prediction parallelism level bit bit serial word instruction pipelining scalar superscalar task thread process data vector memory distributed multithreading temporal simultaneous hyperthreading speculative preemptive cooperative flynn s taxonomy sisd simd array processing simt pipelined processing associative processing swar misd mimd spmd processor performance transistor count instructions per cycle ipc cycles per instruction cpi instructions per second ips floating point operations per second flops transactions per second tps synaptic updates per second sups performance per watt ppw cache performance metrics computer performance by orders of magnitude types central processing unit cpu graphics processing unit gpu gpgpu vector barrel stream tile processor coprocessor pal asic fpga fpoa cpld multi chip module mcm system in a package sip package on a package pop by application embedded system microprocessor microcontroller mobile notebook ultra low voltage asip soft mic...