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==== Front-end ====
 
==== Front-end ====
The front-end is the complicated part of the microarchitecture as it deals with variable length x86 instructions ranging from 1 to 15 bytes. The main goal here is to fetch and decode correctly the next set of instructions. The caches have not changed in Haswell from {{\\|Ivy Bridge}}, with the [[L1i$]] still 32KB , 8-way set associative shared dynamically by the two threads. Instruction cache instruction fetching remains 16B/cycle. [[TLB]] is also still 128-entries, 4-way for 4KB pages and 8-entries, [[fully associative]] for 2MB page mode. The fetched instructions are then moved on to an instruction queue which has 40 entries, 20 for each thread. Haswell continued to improve the branch misses although the exact details have not been made public.
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The front-end is the complicated part of the microarchitecture has it deals with variable length x86 instructions ranging from 1 to 15 bytes. The main goal here is to fetch and decode correctly the next set of instructions. The caches have not changed in Haswell from {{\\|Ivy Bridge}}, with the [[L1i$]] still 32KB , 8-way set associative shared dynamically by the two threads. Instruction cache instruction fetching remains 16B/cycle. [[TLB]] is also still 128-entries, 4-way for 4KB pages and 8-entries, [[fully associative]] for 2MB page mode. The fetched instructions are then moved on to an instruction queue which has 40 entries, 20 for each thread. Haswell continued to improve the branch misses although the exact details have not been made public.
  
 
Haswell has the same µOps cache as Ivy Bridge - 1,536 entries organized in 32 sets of 8 cache lines with 6 µOps each. Hits can yield up to 4-µOps/cycle. The cache supports microcoded instructions (being pointers to ROM entries). Cache is shared by the two threads.
 
Haswell has the same µOps cache as Ivy Bridge - 1,536 entries organized in 32 sets of 8 cache lines with 6 µOps each. Hits can yield up to 4-µOps/cycle. The cache supports microcoded instructions (being pointers to ROM entries). Cache is shared by the two threads.

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codenameHaswell +
core count2 +, 4 +, 6 +, 8 + and 16 +
designerIntel +
first launchedJune 4, 2013 +
full page nameintel/microarchitectures/haswell (client) +
instance ofmicroarchitecture +
instruction set architecturex86-64 +
manufacturerIntel +
microarchitecture typeCPU +
nameHaswell +
phase-out2015 +
pipeline stages (max)19 +
pipeline stages (min)14 +
process22 nm (0.022 μm, 2.2e-5 mm) +