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Cortex-A
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Cortex A8 Instruction Cycle Timing
Offline
barney vardanyan
over 7 years ago
Note: This was originally posted on 17th March 2011 at
http://forums.arm.com
Hi) sorry for bad English
I need to count latency for two instruction, and all I have is the arm cortex A 8 documantation(charter 16) !
but I have no idea how can do this work using that documantation(
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Offline
barney vardanyan
over 7 years ago
Note: This was originally posted on 11th April 2011 at
http://forums.arm.com
I have made tests, and get very strange results.
the test is folowing
I have some cycle and nop intsructions in it.
first I have only one nop in cycle, it's takes 0.570 s on my board
then I add second nop instruction, and it's also takes 0.57 s. and it's true, becaues they executed in thy same cycle(pipeline 0 and pipeline 1)
then I continue to add nop instructions.
So when I got to 5-6 nop pair, I realize that they can't execute parraler
and after every nop instruction that I add increase the time of execution
So why after 5 nop, they don't executed parraler, IS there any idea?
here is the test file)
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barney vardanyan
over 7 years ago
Note: This was originally posted on 11th April 2011 at
http://forums.arm.com
I have made tests, and get very strange results.
the test is folowing
I have some cycle and nop intsructions in it.
first I have only one nop in cycle, it's takes 0.570 s on my board
then I add second nop instruction, and it's also takes 0.57 s. and it's true, becaues they executed in thy same cycle(pipeline 0 and pipeline 1)
then I continue to add nop instructions.
So when I got to 5-6 nop pair, I realize that they can't execute parraler
and after every nop instruction that I add increase the time of execution
So why after 5 nop, they don't executed parraler, IS there any idea?
here is the test file)
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0
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