** [[#Branch instructions|Branch Instructions]] ** [[#Branch instructions|Branch Instructions]]

| start of alternative branch

| {{\|AM29803A}} || 16-way branch control unit for use with {{\|AM2909A}} || 16

...ean algebra''' (or less commonly '''symbolic logic''') is a [[instance of::branch of algebra]] that deals with only two logic values - [[0]] (corresponding t

** [[allows value::branch of algebra]]

===== Branch predictor ===== ...able has 4096 entries and is [[competitively shared]] between threads. The branch buffer target has 128 entries (4-way by 32 sets). While [[unconditional jum

* Double the size of the branch prediction history table === Branch Prediction ===

...al-issue design; however it has a pipeline that is 2 stages shorter with a branch misprediction penalty of 3 cycles lower. Silvermont is the first microarchi ...ction of out-of-order execution, silvermont's more aggressive fetching and branch prediction mean stalled instructions do not clog the entire pipeline as it

...which has 40 entries, 20 for each thread. Haswell continued to improve the branch misses although the exact details have not been made public. ...heduler resources get allocated as well - this includes stores, loads, and branch buffer entries. Note that due to how dependencies are handled, there may be

*** Redesigned branch prediction ...ont-end of Sandy Bridge is the entirely new [[µOP cache]], the overhauled branch predictor and further decoupling of the front-end, and the improved macro-o

*** Improved [[branch prediction unit]] ...ream than in previous architectures. The intimate improvements done in the branch predictor were not further disclosed by Intel.

...ger or floating point, but not both), a single load/store operation, and a branch instruction.

<tr><td>Branch</td></tr>

* Branch Predictor ** 2-level predictor with 8192 entry branch history table

...ribed by Alsup as: "K9 fetched 8 instructions every other cycle and made 2 branch predictions associated with 3 next fetch addresses every other cycle. K9 is

** Branch Predictor *** Improved branch mispredictions

*** Improved [[branch prediction unit]] ...operation, the front-end throughput was improved. AMD reported that the [[branch prediction unit]] has been reworked. This includes improvements to the [[pr

...VFE unit and for spawning child threads (either leaf-node child threads or branch-node parent thread). ...le of integer, single and double precision floating point operations, SIMD branch capability, logical operations, transcendental operations, and other miscel

...VFE unit and for spawning child threads (either leaf-node child threads or branch-node parent thread). ...le of integer, single and double precision floating point operations, SIMD branch capability, logical operations, transcendental operations, and other miscel

* Improved branch prediction ! Fetch/Branch || Slices issue VSU & AGEN || VSU Pipe || LSU Slices

**** 3 instructions + 1 direct branch per cycle

...erscalar]], [[out-of-order]], 4-decode/4-dispatch pipeline with a hybrid [[branch prediction]]. ...required for retrieval of instructions from the L1. Xiaomi has a hybrid [[branch predictor]] made of a [[TAGE predictor]] and a 512-entry [[indirect predict

...) through doubling of the L3 cache, 2x wider FPU datapath, and an improved branch prediction unit. Zen 2 also provided modest clock frequency improvements ov

...) through doubling of the L3 cache, 2x wider FPU datapath, and an improved branch prediction unit. Zen 2 also provided modest clock frequency improvements ov

*** Increased branch prediction bandwidth *** "zero-bubble" branch prediction

...speeds (doubling with each model) along with a larger cache and improved [[branch predictor]]s for triple the performance improvement each time. With the int

...and almost twice the frequency as the {{\\|2B}}, along with an improved [[branch predictor]].

* Branch Predictor ** Indirect branches handled with 64 entry Multiway Branch Prediction Table

...tional [[jump instruction]]. The produced output is a single operation-and-branch instruction. The final fused instruction remains as such for its remaining

* Branch predictor was re-written

* Seznec, André, et al. "Design tradeoffs for the Alpha EV8 conditional branch predictor." Computer Architecture, 2002. Proceedings. 29th Annual Internati

...Consequently, <code>B</code> and <code>BL</code> signed 24-bit offsets can branch to any address.

* [[#branch_instructions|Branch Instructions]] ...=<span id="branch_instructions">'''Branch Instructions'''</span><br><small>Branch instructions order instruction processing to start elsewhere conditionally

...e registers, it's no longer possible to automatically save those bits on a branch and link instruction execution. Upon an exception, however, the CPSR gets c

...r|CF|Carry Flag}} (less than), and {{abbr|PF|Parity Flag}} (unordered) for branch instructions. UCOMI instructions perform an unordered compare and only gene ...nd source2, sets the {{abbr|ZF|Zero Flag}} and {{abbr|CF|Carry Flag}} (for branch instructions) to indicate if the respective result is all zeros.

** Faster branch wakeup * '''IFB''' - Instruction fetch and branch prediction

<tr><td>Branch</td></tr>

*** Enhanced branch prediction *** Supports faster branch redirection.

...witching done to reduce [[forwarding]] and in order mitigate the lack of [[branch prediction]]. Explicit switching of active threads is also done in order to

...condition. Because the conditional was $false, the $custom1 alias in the T branch is not called.

...ting with stepping 11. Stepping 12 adds hardware support for mitigation of Branch Target Injection (Spectre V2) and Speculative Store Bypass.

** Branch prediction unit was reworked and optimized

...is (Variant 1) vulnerability by making the microprocessor take the wrong [[branch target]]. ...code segment is identified, the attacker can then train the processor's [[branch predictor]] that the bounds check will likely be true. This is done by repe

...rmation to the attacker that wouldn't normally be exposed due to a wrong [[branch target]] being temporarily chosen, resulting in {{cve|cve-2017-5753|Spectre ...nformation than intended. This method influences the [[indirect branch]] [[branch predictor|predictor]] in the microprocessor to [[speculative execution|spec

** {{cve|CVE-2017-5715}}, Spectre, Variant 2, Branch Target Injection

** Advanced [[branch predictor]] There are two pipeline stages for the branch predictor for generating addresses. There are three cycles for [[instructio

*** Larger branch prediction * branch misprediction penalty increased (16 cycles, from 14)

* 54: DEFINE group contains more than one branch

* [[Branch delay slots]] The '''branch and repeat unit''' ('''BRU''') is another execution unit with the ability t

** Improved [[branch predictor]]

...ceiving packets from the mesh network as well as program control jumps and branch instructions. There are a number of synchronization primitives for data tra | Jump/Branch || 1

** Improved branch predictor ...operate on. This determination is done on each cycle with the help of the branch predictor with no added cost.

...calar, out-of-order, 2-way [[SMT]] microarchitecture with advanced dynamic branch prediction, 4-way decoding of [[x86]] instructions with a stack optimizer,

...cro-ops per-cycle directly from L1i cache. Denver has 7 execution units: 1 branch, 2 integer (1 has hardware multiply module), 2 FP/NEON (128-bit), 2 Load/St Denver 2 has dynamic branch prediction with Branch Target Buffer and Global History Buffer (Conditional Direction Predictor -

** [[Branch-prediction]] ...essor with an 8-issue back end. The pipeline is 13 stages with an 11-cycle branch misprediction penalty. It has a 64 KiB [[level 1]] [[instruction cache]] an

** [[Branch-prediction]] *** lower latency recovery from branch mispredict flushes

** [[Branch-prediction]] ...cessor with a 10-issue back end. The pipeline is 13 stages with a 10-cycle branch misprediction penalty best-case. It has a private [[level 1]] [[instruction

...on an exception entry and exception exit. This means it is not possible to branch and link between the two modes of execution and it is not possible to reduc

...to 32 instructions long (0x80 bytes), meaning instead of just storing the branch, it's now possible to store the handler directly when it is advantageous to

...was done in order to maximize the hardware reuse. With the exception of [[branch instructions|branches]] and [[comparison instruction|comparisons]], [[predi

...instructions per cycle. NEC stated that the SPU features a sophisticated [[branch predictor]] for [[hardware prefetching]], however, they did not delve into ...nd [[floating-point]] pipelines for general scalar arithmetic, a dedicated branch ALU, a single [[LSU]] execution unit, and a vector EU. Beyond the typical s

** Improved [[branch predictor]] ...predictor]] has also been improved. The intimate improvements done in the branch predictor were not further disclosed by Intel.

...mproved memory subsystem, a larger number of execution units, and a better branch predictor.

**** Improved [[branch predictor]]

...ont-end of the machine versus prior generations. The CNS core has a better branch predictor and better prefetchers. ...tipliers while the other two have bit-manipulation units (BMUs). Up to two branch instructions can be executed each cycle.

...rolExtenstion_WP_7-18Update_FNL.pdf White Paper: AMD64 Technology Indirect Branch Control Extension]||2018-07-10||Ryzen/EPYC ...rolExtenstion_WP_7-18Update_FNL.pdf White Paper: AMD64 Technology Indirect Branch Control Extension]||2018-07-10||Ryzen/EPYC

** Branch-prediction *** Up to 90% reduction in branch mispredictions (for BTB misses)

...anced processor components from Arm's high-performance cores - such as the branch prediction and prefetchers - to extract high performance from a traditional *** New branch predictors

** Compare and branch descriptors

** Compare and branch descriptors

** Compare and branch descriptors

** Compare and branch descriptors

** Compare and branch descriptors

** Compare and branch descriptors

** Compare and branch descriptors

** Compare and branch descriptors

** Compare and branch descriptors

** Compare and branch descriptors

** Compare and branch descriptors

** Compare and branch descriptors

** Compare and branch descriptors

** Compare and branch descriptors

** Compare and branch descriptors

** Compare and branch descriptors

** Compare and branch descriptors

** Compare and branch descriptors

** Compare and branch descriptors

** Compare and branch descriptors

** Compare and branch descriptors

** Compare and branch descriptors

** Compare and branch descriptors

** Compare and branch descriptors

** Compare and branch descriptors

** Compare and branch descriptors

...struction cache, write-back data cache, register file, and write buffer. A branch prediction unit is not present or needed. All pipeline stages complete in o ...elay slot, an instruction following a branch which is executed even if the branch is taken, generally a <code>NOP</code> or preferably an instruction perform

...no alignment requirement, scatter/gather and stride transfers, compare and branch descriptors for transfers conditional on I/O registers, and various priorit

...nd source2, sets the {{abbr|ZF|Zero Flag}} and {{abbr|CF|Carry Flag}} (for branch instructions) to indicate if the respective result is all zeros.