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Cortex A8 Instruction Cycle Timing
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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
Etienne SOBOLE
over 7 years ago
Note: This was originally posted on 14th June 2011 at
http://forums.arm.com
Hi Dung.
for MRS and MSR: there is a lot of instruction that I've not found real cycle timing and I do not have time to test.
In this case the rules are in the file only for parsing purpose...
Take the last version (but keep the previous one because I've change a lot of things).
For example I remove all the STM and LDM rules. There is to many case. Now I build this rules automaticaly in the cycle counter.
dstCond is the cycle for destination register when the instruction is conditional. That's the case for
MOVEQ r0, #5
in this case r0 is written a stage 2 while without conditionnal information
MOV r0, #5
r0 will be written at stage 1
In conditional instruction, destination register must be read
cc-dst1 and cc-dst2 are the stage where destination register are read for conditional instructions.
Etienne
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Offline
Etienne SOBOLE
over 7 years ago
Note: This was originally posted on 14th June 2011 at
http://forums.arm.com
Hi Dung.
for MRS and MSR: there is a lot of instruction that I've not found real cycle timing and I do not have time to test.
In this case the rules are in the file only for parsing purpose...
Take the last version (but keep the previous one because I've change a lot of things).
For example I remove all the STM and LDM rules. There is to many case. Now I build this rules automaticaly in the cycle counter.
dstCond is the cycle for destination register when the instruction is conditional. That's the case for
MOVEQ r0, #5
in this case r0 is written a stage 2 while without conditionnal information
MOV r0, #5
r0 will be written at stage 1
In conditional instruction, destination register must be read
cc-dst1 and cc-dst2 are the stage where destination register are read for conditional instructions.
Etienne
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