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This is where I saw a benefits to using valued reservation stations vs
valueless ones - when a uArch has multiple similar FU each with its own
bank of RS that is scheduled for that FU.
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Example of horizontal scaling of similar FU each with its own RS bank.
https://i0.wp.com/chipsandcheese.com/wp-content/uploads/2024/07/cheese_oryon_diagram_revised.png
>
With valueless RS, each RS stores only the source register number of
its operands and each FU has to be able to read all its operands
when a uOp launches (begins execution).
This means the number of
PRF read ports scales according to the total number of FU operands.
(One could do read port sharing but then you have to schedule that too
and could have contention.)
Also if an FU is unused on any cycle then
all its (expensive) operand read ports are unused.
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Using the above Oryon as an example, with valueless RS, to launch
all 14 FU with 3 operands all at once needs 42 read ports.
With valued RS, to Dispatch 6 wide with 3 operands needs 18 read ports,
and the read ports are potentially usable for all dispatches.
Date | Sujet | # | Auteur | |
13 Jul 24 | Continuations | 138 | Lawrence D'Oliveiro | |
13 Jul 24 | Re: Continuations | 4 | BGB | |
14 Jul 24 | Re: Continuations | 2 | aph | |
15 Jul 24 | Re: Continuations | 1 | Lawrence D'Oliveiro | |
14 Jul 24 | Re: Continuations | 1 | Anton Ertl | |
13 Jul 24 | Re: Continuations | 23 | John Dallman | |
14 Jul 24 | Re: Continuations | 21 | Lawrence D'Oliveiro | |
14 Jul 24 | Re: Continuations | 20 | George Neuner | |
14 Jul 24 | Re: Continuations | 19 | John Levine | |
14 Jul 24 | Re: Continuations | 18 | Niklas Holsti | |
15 Jul 24 | Re: Continuations | 16 | John Levine | |
15 Jul 24 | Re: Continuations | 1 | Terje Mathisen | |
15 Jul 24 | Re: Continuations | 1 | John Levine | |
15 Jul 24 | Re: Continuations | 9 | Niklas Holsti | |
16 Jul 24 | Re: Continuations | 8 | Lawrence D'Oliveiro | |
16 Jul 24 | Re: Continuations | 7 | John Levine | |
16 Jul 24 | Re: Continuations | 1 | Chris M. Thomasson | |
16 Jul 24 | Re: Continuations | 5 | Lawrence D'Oliveiro | |
16 Jul 24 | Re: Continuations | 4 | John Levine | |
16 Jul 24 | Re: Continuations | 3 | Lawrence D'Oliveiro | |
16 Jul 24 | Re: Continuations | 2 | MitchAlsup1 | |
17 Jul 24 | Re: Continuations | 1 | Lawrence D'Oliveiro | |
16 Jul 24 | Re: Continuations | 3 | Lawrence D'Oliveiro | |
16 Jul 24 | Re: Continuations | 2 | MitchAlsup1 | |
16 Jul 24 | Re: Continuations | 1 | Lawrence D'Oliveiro | |
16 Jul 24 | Re: Continuations | 1 | MitchAlsup1 | |
16 Jul 24 | Re: Continuations | 1 | Lawrence D'Oliveiro | |
14 Jul 24 | Re: Continuations | 1 | BGB | |
13 Jul 24 | Re: Continuations | 1 | BGB | |
14 Jul 24 | Re: Continuations | 10 | Lawrence D'Oliveiro | |
15 Jul 24 | Re: Continuations | 7 | Thomas Koenig | |
15 Jul 24 | Re: Continuations | 6 | Thomas Koenig | |
16 Jul 24 | Re: Continuations | 4 | Thomas Koenig | |
16 Jul 24 | Re: Continuations | 2 | MitchAlsup1 | |
17 Jul 24 | Re: Continuations | 1 | Lawrence D'Oliveiro | |
17 Jul 24 | Re: Continuations | 1 | Lawrence D'Oliveiro | |
17 Jul 24 | Re: Continuations | 1 | John Dallman | |
16 Jul 24 | Re: Continuations | 1 | Lawrence D'Oliveiro | |
16 Jul 24 | Re: Continuations | 1 | John Levine | |
14 Jul 24 | Re: Continuations | 1 | George Neuner | |
14 Jul 24 | Re: Continuations | 92 | John Savard | |
14 Jul 24 | Re: Continuations | 1 | BGB | |
15 Jul 24 | Re: Continuations | 90 | Lawrence D'Oliveiro | |
16 Jul 24 | Re: Continuations | 89 | John Savard | |
16 Jul 24 | Re: Continuations | 2 | MitchAlsup1 | |
17 Jul 24 | Re: Continuations | 1 | Lawrence D'Oliveiro | |
16 Jul 24 | Re: Continuations | 86 | MitchAlsup1 | |
17 Jul 24 | Re: Continuations | 69 | John Savard | |
17 Jul 24 | Re: Continuations | 68 | MitchAlsup1 | |
17 Jul 24 | Re: Continuations | 67 | Thomas Koenig | |
17 Jul 24 | Re: Continuations | 1 | Thomas Koenig | |
17 Jul 24 | Re: Continuations | 1 | Michael S | |
17 Jul 24 | Re: Continuations | 37 | MitchAlsup1 | |
17 Jul 24 | Re: Continuations | 36 | Stephen Fuld | |
17 Jul 24 | Re: Continuations | 35 | MitchAlsup1 | |
17 Jul 24 | Re: Continuations | 22 | Stephen Fuld | |
18 Jul 24 | Re: Continuations | 8 | MitchAlsup1 | |
18 Jul 24 | Re: Continuations | 1 | Michael S | |
18 Jul 24 | Re: Continuations | 6 | MitchAlsup1 | |
19 Jul 24 | Re: Continuations | 1 | Stephen Fuld | |
21 Jul 24 | Re: Reservation stations [was Continuations] | 2 | Anton Ertl | |
21 Jul 24 | Re: Reservation stations [was Continuations] | 1 | MitchAlsup1 | |
21 Jul 24 | Re: Reservation stations [was Continuations] | 2 | MitchAlsup1 | |
22 Jul 24 | IPC (was: Reservation stations) | 1 | Anton Ertl | |
18 Jul 24 | Re: Continuations | 11 | Thomas Koenig | |
18 Jul 24 | Re: Continuations | 10 | Michael S | |
18 Jul 24 | Re: Continuations | 9 | Thomas Koenig | |
18 Jul 24 | Re: Continuations | 8 | Michael S | |
18 Jul 24 | Re: Continuations | 6 | Thomas Koenig | |
18 Jul 24 | Re: Continuations | 1 | Michael S | |
18 Jul 24 | Re: Continuations | 4 | Michael S | |
19 Jul 24 | Re: Continuations | 3 | Thomas Koenig | |
19 Jul 24 | Re: Continuations | 2 | Michael S | |
20 Jul 24 | Re: Continuations | 1 | Thomas Koenig | |
18 Jul 24 | Re: Continuations | 1 | MitchAlsup1 | |
18 Jul 24 | Re: Continuations | 2 | John Savard | |
18 Jul 24 | Re: Continuations | 1 | Thomas Koenig | |
18 Jul 24 | Re: Continuations | 6 | Thomas Koenig | |
18 Jul 24 | Re: Continuations | 5 | Michael S | |
18 Jul 24 | Re: Continuations | 4 | Michael S | |
18 Jul 24 | Re: Continuations | 3 | Thomas Koenig | |
18 Jul 24 | Re: Continuations | 2 | MitchAlsup1 | |
20 Jul 24 | Re: Continuations | 1 | Thomas Koenig | |
18 Jul 24 | Non-pipelined FDIV/SQRT (was: Continuations) | 3 | Stefan Monnier | |
18 Jul 24 | Re: Non-pipelined FDIV/SQRT | 1 | MitchAlsup1 | |
28 Jul 24 | Re: Non-pipelined FDIV/SQRT | 1 | Michael S | |
18 Jul 24 | Re: Continuations | 3 | MitchAlsup1 | |
28 Jul 24 | Re: Continuations | 2 | Paul A. Clayton | |
28 Jul 24 | Re: Continuations | 1 | Michael S | |
19 Jul 24 | Re: Continuations | 27 | Terje Mathisen | |
19 Jul 24 | Re: Continuations | 5 | Thomas Koenig | |
19 Jul 24 | Re: Continuations | 1 | Chris M. Thomasson | |
19 Jul 24 | Re: Continuations | 3 | MitchAlsup1 | |
20 Jul 24 | Re: Continuations | 1 | Terje Mathisen | |
20 Jul 24 | Re: Continuations | 1 | Thomas Koenig | |
19 Jul 24 | Re: Continuations | 21 | MitchAlsup1 | |
19 Jul 24 | Re: Continuations | 8 | Terje Mathisen | |
22 Jul 24 | Re: Continuations | 7 | Michael S | |
22 Jul 24 | Re: Continuations | 3 | MitchAlsup1 | |
22 Jul 24 | Re: Continuations | 2 | Michael S | |
23 Jul 24 | Re: Continuations | 1 | MitchAlsup1 | |
23 Jul 24 | Re: Continuations | 3 | Terje Mathisen | |
19 Jul 24 | Faster div or 1/sqrt approximations (was: Continuations) | 12 | Thomas Koenig | |
17 Jul 24 | Re: Continuations | 3 | Lawrence D'Oliveiro | |
17 Jul 24 | Re: Continuations | 12 | Stephen Fuld | |
17 Jul 24 | Re: fancy instructions, Continuations | 1 | John Levine | |
15 Jul 24 | Re: Continuations | 1 | wolfgang kern | |
15 Jul 24 | Re: pessimal storage allocation, Continuations | 3 | John Levine | |
15 Jul 24 | Re: Continuations | 1 | MitchAlsup1 | |
16 Jul 24 | Re: Continuations | 1 | Lynn Wheeler |
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