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===== Execution Units ===== | ===== Execution Units ===== | ||
− | Some of the biggest architectural changes were done in the area of the execution units. Haswell widened the scheduler by two ports - one new integer dispatch port and a new memory port bringing the total to 8 µOps/cycle. The various ports have also been rebalanced. The new port 6 adds another Integer ALU designs to improve integer workloads freeing up Port 0 and 1 for vector works. It also adds a second branch unit to | + | Some of the biggest architectural changes were done in the area of the execution units. Haswell widened the scheduler by two ports - one new integer dispatch port and a new memory port bringing the total to 8 µOps/cycle. The various ports have also been rebalanced. The new port 6 adds another Integer ALU designs to improve integer workloads freeing up Port 0 and 1 for vector works. It also adds a second branch unit to low the congestion Port 0. The second port that was added, Port 7 adds a new [[address generation unit|AGU]]. This is largely due to the improvements for {{x86|AVX2}} that roughly doubled its throughput. Port 0 had its ALU/Mul/shifter extended to 256-bits; same is true for the vector ALU on port 1 and the ALU/shuffle on port 5. Additionally a 256-bit FMA unit were added to both port 0 and port 1. The change makes it possible for FMAs and FMULs to issue on both ports. In theory, Haswell can peak at over double the performance of {{\|Sandy Bridge}}, with 16 double / 32 single precision [[FLOP]]/cycle + Integer ALU option + Vector operation. |
The scheduler dispatches up to 8 ready µOps/cycle in [[FIFO]] order through the dispatch ports. µOps involving computational operations are sent to ports 0, 1, 5, and 6 to the appropriate unit. Likewise ports 2, 3, 4 and 7 are used for load/store and address calculations. | The scheduler dispatches up to 8 ready µOps/cycle in [[FIFO]] order through the dispatch ports. µOps involving computational operations are sent to ports 0, 1, 5, and 6 to the appropriate unit. Likewise ports 2, 3, 4 and 7 are used for load/store and address calculations. |
Facts about "Haswell - Microarchitectures - Intel"
codename | Haswell + |
core count | 2 +, 4 +, 6 +, 8 +, 16 +, 10 +, 12 +, 14 + and 18 + |
designer | Intel + |
first launched | June 4, 2013 + |
full page name | intel/microarchitectures/haswell (client) + |
instance of | microarchitecture + |
instruction set architecture | x86-64 + |
manufacturer | Intel + |
microarchitecture type | CPU + |
name | Haswell + |
phase-out | 2015 + |
pipeline stages (max) | 19 + |
pipeline stages (min) | 14 + |
process | 22 nm (0.022 μm, 2.2e-5 mm) + |