* Function reorder with -fprofile-reorder-functions
@ 2022-01-26 0:48 prem paulson
2022-02-01 5:59 ` prem paulson
0 siblings, 1 reply; 2+ messages in thread
From: prem paulson @ 2022-01-26 0:48 UTC (permalink / raw)
To: gcc-help
Hello,
I am experimenting with function reordering using PGO. I am looking at
ordering functions based on the Last time of execution. For example, if the
sequence of calls from profile feedback is:
func1() -> func2() -> func3() -> func1()->func4()
I would like the reordering in the binary as follows:
func2
func3
func1
func4
The closest option I see is -fprofile-reorder-functions but it reorders
based on the first time of execution.
-fprofile-reorder-functions
Function reordering based on profile instrumentation collects first time of
execution of a function and orders these functions in ascending order.
Is there any similar option that can help me achieve this?
Thanks in advance.
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Function reorder with -fprofile-reorder-functions
2022-01-26 0:48 Function reorder with -fprofile-reorder-functions prem paulson
@ 2022-02-01 5:59 ` prem paulson
0 siblings, 0 replies; 2+ messages in thread
From: prem paulson @ 2022-02-01 5:59 UTC (permalink / raw)
To: gcc-help
Bump.
Hello experts,
Looking through the code, I noticed cgraph_node::tp_first_run that helps in
implementation of "-fprofile-reorder-functions". Can someone please comment
on how feasible it would be to implement ordering functions based on "Last"
time of execution?
Thank you.
On Tue, Jan 25, 2022 at 4:48 PM prem paulson <prempaulson@gmail.com> wrote:
> Hello,
>
> I am experimenting with function reordering using PGO. I am looking at
> ordering functions based on the Last time of execution. For example, if the
> sequence of calls from profile feedback is:
>
> func1() -> func2() -> func3() -> func1()->func4()
>
> I would like the reordering in the binary as follows:
>
> func2
> func3
> func1
> func4
>
> The closest option I see is -fprofile-reorder-functions but it reorders
> based on the first time of execution.
>
> -fprofile-reorder-functions
> Function reordering based on profile instrumentation collects first time
> of execution of a function and orders these functions in ascending order.
>
> Is there any similar option that can help me achieve this?
>
> Thanks in advance.
>
>
^ permalink raw reply [flat|nested] 2+ messages in thread
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