* Loop fusion in gcc
@ 2023-09-23 12:53 Hanke Zhang
2023-09-24 6:35 ` Richard Biener
0 siblings, 1 reply; 2+ messages in thread
From: Hanke Zhang @ 2023-09-23 12:53 UTC (permalink / raw)
To: gcc
Hi, I have been very interested in loop fusion recently. I found that
both LLVM and icc have implemented this optimization. I also noticed
that gcc does not seem to implement it.
I would like to ask if gcc have any plans to implement this
optimization? In addition, I also found that there is a function
called `fuse_loop` in gcc/gimple-loop-jam.cc. Can it achieve the
purpose of loop fusion?
Hanke Zhang.
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Loop fusion in gcc
2023-09-23 12:53 Loop fusion in gcc Hanke Zhang
@ 2023-09-24 6:35 ` Richard Biener
0 siblings, 0 replies; 2+ messages in thread
From: Richard Biener @ 2023-09-24 6:35 UTC (permalink / raw)
To: Hanke Zhang; +Cc: gcc
On Sat, Sep 23, 2023 at 2:54 PM Hanke Zhang via Gcc <gcc@gcc.gnu.org> wrote:
>
> Hi, I have been very interested in loop fusion recently. I found that
> both LLVM and icc have implemented this optimization. I also noticed
> that gcc does not seem to implement it.
>
> I would like to ask if gcc have any plans to implement this
> optimization? In addition, I also found that there is a function
> called `fuse_loop` in gcc/gimple-loop-jam.cc. Can it achieve the
> purpose of loop fusion?
I do not know of anybody implementing loop fusion. The fuse_loop
function in unroll-and-jam might be able to fuse two loops in the IL
but it does not perform the required checking for correctness of
such transform and instead relies on the two loops being formed
by unrolling the loop containing them.
Richard.
>
> Hanke Zhang.
^ permalink raw reply [flat|nested] 2+ messages in thread
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